This standard is a revision of GB 16690-1996 "Hong Kong Special Administrative Region Emblem". This standard specifies the technical requirements, test methods, inspection rules, marking and packaging of the Hong Kong Special Administrative Region emblem of the People's Republic of China for hanging. This standard is applicable to emblems made of fiber reinforced plastics or aluminum alloy. The flat emblem patterns of other materials made by printing and other processes should also refer to the relevant requirements of this standard. Compared with GB 16690-1996, the main changes of this standard are as follows: ---Appendix A and Appendix B in the original standard are revised to "normative reference documents". GB 16690-2008 Hong Kong Special Administrative Region Emblem GB16690-2008 Standard download decompression password: www.bzxz.net
This standard is a revision of GB 16690-1996 "Hong Kong Special Administrative Region Emblem". This standard specifies the technical requirements, test methods, inspection rules, marking and packaging of the Hong Kong Special Administrative Region emblem of the People's Republic of China for hanging. This standard applies to regional emblems made of fiber reinforced plastics or aluminum alloy. The flat regional emblem patterns made of other materials by printing and other processes should also refer to the relevant requirements of this standard. Compared with GB 16690-1996, the main changes of this standard are as follows: ————Appendix A and Appendix B in the original standard are revised as "normative reference documents".
All technical contents of this standard are mandatory.
This standard is a revision of GB 16690-1996 "Regional Emblem of the Hong Kong Special Administrative Region".
Compared with GB 16690-1996, the main changes of this standard are as follows:
————Appendix A and Appendix B in the original standard are revised as "normative reference documents".
Appendix A of this standard is a normative appendix.
This standard is proposed by the Hong Kong and Macao Affairs Office of the State Council. This
standard is under the jurisdiction of the National Technical Committee on Color Standardization.
The responsible drafting units of this standard are: Institute of Psychology, Chinese Academy of Sciences, Shenzhen Haichuan Industrial Co., Ltd.
The main drafters of this standard are: Han Buxin, Sun Xiuru, Huang Duan, He Weiping, Zheng Wei.
The previous versions of the standards replaced by this standard are as follows:
———GB 16690-1996
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this standard.
GB/T1449 Test method for bending properties of fiber reinforced plastics
GB/T1720 Determination of adhesion of paint films
GB/T1733 Determination of water resistance of paint films (GB/T1733-1993, ｎｅｑＧＯＣＴ９．４０３：１９８０)
GB/T1740 Determination of moisture and heat resistance of paint films
GB/T1766 Rating method for aging of paints and varnishes
GB/T1771 Determination of neutral salt spray resistance of paints and varnishes (GB/T1771-2007, ISO7253:１９９６, IDT)
GB/T3854 Test method for Barcol hardness of reinforced plastics
GB/T3979 Methods for measuring colour of objects
GB/T4380—2004 Evaluation of roundness error - two-point and three-point methods
GB/T6739 Determination of film hardness of paints and varnishes by pencil method (GB/T6739—2006, ISO15184:1998, IDT)
GB/T9274 Determination of resistance of paints and varnishes to liquid media (GB/T9274—1988, eqvi ISO2812:1974)
GB/T9754 Paints and varnishes - Determination of specular gloss at 20°, 60° and 85° of paint films without metallic colours (GB/T9754-2007, ISO2813:1994, IDT)
GB/T11186.2-1989 Methods for measuring colour of coating films - Part 2: Measurement of colour (GB/T11186.2-1989, eqvISO7724-2:1984)
GB/T11186.3-1989 Methods for measuring colour of coating films - Part 3: Calculation of colour difference (GB/T11186.3-1989, eqvISO7724-3:1984)
GB/T11337-2004 Detection of flatness error
GB15093 National Emblem
Basic Law of the Hong Kong Special Administrative Region of the People's Republic of China
Interim Measures for the Use of the Regional Flag and Regional Emblem of the Hong Kong Special Administrative Region of the People's Republic of China

ICS01.080.10
National Standard of the People's Republic of China
GB166902008
Replaces GB16690—1996
Regional emblem of Hong Kong special administrative region
Regional emblem of Hong Kong special administrative region2008-06-19 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2009-06-01 Implementation
All technical contents of this standard are mandatory. Foreword
This standard is a revision of GB16690—1996 "Regional Emblem of the Hong Kong Special Administrative Region". The main changes of this standard compared with GB16690—1996 are as follows: Appendix A and Appendix B in the original standard are revised to "normative reference documents". Appendix A of this standard is a normative appendix.
This standard is proposed by the Hong Kong and Macao Affairs Office of the State Council. This standard is under the jurisdiction of the National Technical Committee on Color Standardization. The responsible drafting units of this standard are: Institute of Psychology, Chinese Academy of Sciences, Shenzhen Haichuan Industrial Co., Ltd. The main drafters of this standard are: Han Buxin, Sun Xiuru, Huang Duan, He Weiping, Zheng Wei. The previous versions of the standards replaced by this standard are: GB16690-1996.
GB16690—2008
1 Scope
Hong Kong Special Administrative Region Emblem
GB16690—2008
This standard specifies the technical requirements, test methods, inspection rules, marking and packaging of the Hong Kong Special Administrative Region Emblem of the People's Republic of China (hereinafter referred to as the Emblem) for hanging. This standard is applicable to emblems made of fiber reinforced plastics or aluminum alloy. The flat emblem patterns of other materials made by printing and other processes should also refer to the relevant requirements of this standard. 2 Normative references
The provisions in the following documents become the provisions of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to investigate whether the latest versions of these documents can be used. For any undated referenced document, the latest version applies to this standard. GB/T1449
Test method for bending properties of fiber reinforced plasticsGB/T1720
GB/T1733
GB/T1740
GB/T1766
GB/T1771
GB/T3854
GB/T3979
Determination method for adhesion of paint films
Determination method for water resistance of paint films (GB/T1733-1993, neqIOCT9.403:1980)Determination method for resistance to moisture and heat of paint films
Aging of paint and varnish coatings Rating methods Determination of neutral salt spray resistance of paints and varnishes (GB/T1771-2007, ISO7253:1996.IDT) Barcol hardness test method for reinforced plastics
Method for measuring color of objects
GB/T4380-2004 Evaluation of roundness error Two-point and three-point methods GB/T6739
GB/T9274
GB/T9754
Determination of film hardness by pencil method for paints and varnishes (GB/T6739-2006, ISO15184:1998.IDT) Resistance of paints and varnishes Determination of liquid media (GB/T9274-1988, eqvISO2812:1974) Paints and varnishes Determination of 20°60° and 85° specular gloss of paint films without metallic colors (GB/T9754-2007, ISO2813:1994, IDT) GB/T11186.2-1989
ISO7724-2:1984)
GB/T11186.3-1989
ISO7724-3:1984)
Methods for measuring the color of coatings Part 2: Color Measurement of color (GB/T11186.2—1989, eqvMethods for measuring color of coatings Part 3: Calculation of color difference (GB/T11186.3—1989, eqvGB/T11337—2004
Flatness error detection
GB15093Guowei
Basic Law of the Hong Kong Special Administrative Region of the People's Republic of ChinaInterim Measures for the Use of the Regional Flag and Regional Emblem of the Hong Kong Special Administrative Region of the People's Republic of China3 Terms and Definitions
The following terms and definitions apply to this standard.3.1
Regional Microstructure of the Hong Kong Special Administrative Region Emblem of Hong Kong special administrative region The emblem of the Hong Kong Special Administrative Region established by the People's Republic of China is a bauhinia flower with five-star stamens in the middle, and the words "Hong Kong Special Administrative Region of the People's Republic of China" and "Hong Kong" in English written around it. 1
GB16690—2008
white color of bauhinia petal
white color of bauhinia petalbzxZ.net
white color with a specific reflectance ratio used for the purple flower identification on the surface of the regional flag. 4 Technical requirements
4.1 Shape and pattern of the regional emblem
4.1.1 The shape and pattern of the regional emblem shall comply with the relevant provisions of the Basic Law of the Hong Kong Special Administrative Region of the People's Republic of China. 4.1.2 The pattern of the regional emblem is shown in Figure 1.
Figure 1 The pattern of the regional emblem of the Hong Kong Special Administrative Region of the People's Republic of China 4.2 Dimensions and allowable errors of the standard regional emblem
The dimensions of each part of the standard regional emblem shall comply with the relevant provisions of the Interim Measures for the Use of the Regional Flag and Regional Emblem of the Hong Kong Special Administrative Region of the People's Republic of China.
The dimensions and allowable errors of each part of the standard regional emblem are shown in Table 1, Figure 2 and Figure 3. The analytical diagram and data for the production of the standard regional emblem are shown in Appendix A. When it is necessary to produce a regional emblem of non-standard size, it should be enlarged or reduced in proportion to the standard dimensions and allowable errors of the regional emblem. Table 1 Dimensions and allowable errors of each part of the standard regional emblem
Emblem surface diameter
Red overall thickness
Red annular narrow edge width
Red bauhinia stamen width
Code in Figure 2
1000±6
Standard dimensions and allowable errors
800±5
Unit is mm
600±4
Red inner circle diameter
White bauhinia flower circumscribed circle diameter
Red five-pointed star circumscribed circle diameter
Chinese character area angle
English character area angle| |tt||Five-pointed star positioning angle
Bauhinia petal positioning angle
Microfacet outer edge bevel angle
Chinese, English, five-pointed star positioning radius
Chinese character height
English letter height
Five-pointed star depth
Red inner circle thickness
Chinese and English character thickness
Bauhinia petal thickness
Bauhinia stamen depth
Red ring narrow edge inner thickness
Emblem surface unevenness
Microfacet non-roundness
Emblem bottom surface unevenness
Emblem back mounting screw holes
Micro-emblem area Surface color and allowable error
Table 1 (continued)
Codes in Figure 2
780±3
600±3
220°±1°
80°±1°
110°±1°
14'±2°
5°8°
440±2
GB16690—2008
Unit: mm
Standard dimensions and allowable errors
624±2
480±2
220°±1°||tt| |80°±1°
110°±1°
14°±2°
5°8°
220°±1°
80°±1°
110°±1°
14°±2°
5°~8°
264±1
To be determined by negotiation between the manufacturer and the user
4.3.1 Red emblem: The red emblem and the allowable error of the regional emblem made of fiber reinforced plastic and aluminum alloy shall be based on the red emblem and the allowable error of the national emblem made of fiber reinforced plastic and aluminum alloy in GB15093 respectively. 4.3.2 White Bauhinia petals: The stimulation value Y1o of the white Bauhinia petals of the regional emblem made of fiber reinforced plastic and aluminum alloy shall not be less than 80. 4.3.3 The red color and allowable error of the regional emblem made of other materials shall be based on the red color and allowable error of the national emblem of aluminum alloy in GB15093. The stimulus value Y1o of the white petals of Bauhinia should be consistent with the provisions in 4.3.2 of this standard. 3
GB16690—2008
Figure 2 Dimensions of various parts of the standard regional emblem
Note: The diameter of the mounting hole on the back of the regional emblem and the radius of the mounting hole from the center of the emblem back are determined by negotiation between the manufacturer and the user. Figure 3 Schematic diagram of the mounting hole on the back of the regional micro
4.4 Calculation of chromaticity data
The chromaticity data in 4.3 are calculated based on the CIE standard illuminant Ds and the CIE1964 standard chromaticity system. 4.5 Properties of the paint film on the regional emblem
The properties of the paint film on the regional micro are shown in Table 2.
Micro-surface paint film performance
Paint film color and appearance
Gloss (60°)/%
Adhesion/grade
Hardness (Pablo)
Weather resistance/grade
Water resistance (24 h)）
Moisture and heat resistance (7d)/level
Salt spray resistance (7d)/level
GB16690-—2008
The color meets the requirements of 4.3 of this standard, and the paint film is smooth and bright>90
No blistering or shedding
GB16690—2008
4.6 Strength of micro-material of the zone emblem
4.6.1Bending strength is not less than 140MPa
4.6.2Surface hardness (Babill) is not less than 30.4.6.3Falling ball impact strength: The zone emblem has no cracks or damage. 4.7Appearance evaluation of the zone emblem surface
The requirements for the appearance evaluation of the emblem surface are shown in Table 3.
Table 3 Appearance Assessment Requirements of Emblem
Appearance of Emblem
Color of Emblem
The surface pattern is clear, and there shall be no shrinkage, thermal cracking, cold cracking, deformation, edge gaps, acid edges, and no sand, impurities, or pores that obviously affect the appearance
There shall be no obvious stains, color overlap, or color collapse, etc. 4.8 Chinese and English Red Fonts on the Regional Emblem
The red fonts of "Hong Kong Special Administrative Region of the People's Republic of China" on the regional emblem micro-emblem shall comply with the standard regional emblem characters shown in Figure 4. 4.8.1
The red fonts of "HONGKONG" (Hong Kong) on ​​the regional emblem micro-emblem shall comply with the standard regional emblem characters shown in Figure 4. 4.8.2
Figure 4 Chinese and English standard words on the emblem
5 Test method
5.1 The measurement of the dimensions and allowable errors of the various parts of the standard micro-area should be carried out using qualified measuring tools with an accuracy of not less than 0.5%. 5.2 Chromaticity measurement should be carried out in accordance with the provisions of GB/T3979, GB/T11186.2-1989 and GB/T11186.3-1989. 5.3 The performance of the paint film on the emblem should be measured in accordance with the provisions of GB/T1720, GB/T1733, GB/T1740, GB/T1766, GB/T1771, GB/T6739, GB/T9274 and GB/T9754. 5.4 Strength test
5.4.1 The bending strength test should be carried out in accordance with the provisions of GB/T1449. 5.4.2 Hardness test shall be carried out in accordance with the provisions of GB/T3854. 6
GB16690—2008
5.4.3 Drop ball impact: Place the area emblem sample with the front side facing up and horizontally on the cement floor, and place a steel ball weighing 112g 1m above the sample, so that the steel ball falls freely on the same plane of the emblem surface. Repeat three times, and observe whether the surface of the sample has cracks, deformation, delamination, etc. 5.5 The unevenness test of the emblem surface and micro bottom surface shall be carried out in accordance with the method 4.4b of GB/T11337-2004. 5.6 The non-roundness test of the emblem body shall be carried out in accordance with the two-point measurement method of 2.3 of GB/T4380-2004. 5.7 Appearance evaluation of the emblem surface: It shall be visually evaluated at a distance of 1m from the micro surface under bright natural light; when evaluating under light, a daylight color fluorescent lamp with an illumination of not less than 7501x shall be used.
6 Inspection rules
6.1 Inspection classification
6.1.1 Factory inspection
Each regional emblem product shall be subject to factory inspection before leaving the factory. The contents of factory inspection include the shape, pattern and dimensions of each part of the regional emblem and the quality assessment of the appearance and color of the emblem surface.
When all inspection items are qualified during factory inspection, it is judged as a qualified product, otherwise it is a non-conforming product. Non-conforming products shall not leave the factory. 6.1.2 Type inspection
When the emblem material, emblem paint formula, and production process change, a type inspection shall be carried out. When all quality requirements specified in Chapter 4 are qualified, it is judged to be qualified in type inspection and formal production is allowed. 7 Marking and packaging
7.1 Marking
The name and address of the manufacturer, product number and production date shall be indicated on the back of each regional emblem. 7.2 Packaging
7.2.1 Each regional emblem shall be packaged separately. The packaging should ensure that the quality of the regional emblem is not damaged and is convenient for transportation and storage. The outside of the outer packaging should indicate the product name, specifications, materials, packaging size, weight, name and address of the manufacturer, trademark and number of the national standard implemented, and transportation mark. The outer packaging should be accompanied by the necessary accessories for installation, installation and storage instructions and inspection certificate. The inspection certificate should indicate the regional emblem specifications, materials, product number, factory date, name and address of the manufacturer, trademark, and name (or code) of the inspector. 7.2.2 The packaging of batch regional micros should ensure that the quality of the regional emblem is not damaged and is convenient for transportation. The outside of the packaging should indicate the product name, specifications, materials, quantity, packaging size, weight, name and address of the manufacturer, and transportation mark. ?
GB16690—2008
Appendix A
(Normative Appendix)
Analysis diagram of regional microscopy production in the Hong Kong Special Administrative Region of the People's Republic of China
A1 Make AB equal to CD and intersect vertically at the midpoint. Draw the first circle with this point as the center C and half AB as the radius. Draw a regular five-pointed star inside the circle as an auxiliary line (Figure A.1). Figure A.1
A.2 Draw the second circle with the midpoint of AC as the center C2 and half AC as the radius (Figure A.2). Figure A.2
GB16690—2008
GB16690—2008
A.3 Connect C and C to get the intersection F, and draw the third circle with the midpoint of CF as the center C3 and half CF as the radius. Connect C2 and E to get the intersection G, and draw the fourth circle with the midpoint of GE as the center C and half GE as the radius (Figure A, 3). Figure A.32
Figure 4 Chinese and English standard words on the emblem
5 Test method
5.1 The measurement of the dimensions and allowable errors of the various parts of the standard micro-area should be carried out using qualified measuring tools with an accuracy of not less than 0.5%. 5.2 Chromaticity measurement should be carried out in accordance with the provisions of GB/T3979, GB/T11186.2-1989 and GB/T11186.3-1989. 5.3 The performance of the paint film of the emblem should be measured in accordance with the provisions of GB/T1720, GB/T1733, GB/T1740, GB/T1766, GB/T1771, GB/T6739, GB/T9274 and GB/T9754. 5.4 Strength test
5.4.1 The bending strength test should be carried out in accordance with the provisions of GB/T1449. 5.4.2 Hardness test shall be carried out in accordance with the provisions of GB/T3854. 6
GB16690—2008
5.4.3 Drop ball impact: Place the area emblem sample with the front side facing up and horizontally on the cement floor, and place a steel ball weighing 112g 1m above the sample, so that the steel ball falls freely on the same plane of the emblem surface. Repeat three times, and observe whether the surface of the sample has cracks, deformation, delamination, etc. 5.5 The unevenness test of the emblem surface and micro bottom surface shall be carried out in accordance with the method 4.4b of GB/T11337-2004. 5.6 The non-roundness test of the emblem body shall be carried out in accordance with the two-point measurement method of 2.3 of GB/T4380-2004. 5.7 Appearance evaluation of the emblem surface: It shall be visually evaluated at a distance of 1m from the micro surface under bright natural light; when evaluating under light, a daylight color fluorescent lamp with an illumination of not less than 7501x shall be used.
6 Inspection rules
6.1 Inspection classification
6.1.1 Factory inspection
Each regional emblem product shall be subject to factory inspection before leaving the factory. The contents of factory inspection include the shape, pattern and dimensions of each part of the regional emblem and the quality assessment of the appearance and color of the emblem surface.
When all inspection items are qualified during factory inspection, it is judged as a qualified product, otherwise it is a non-conforming product. Non-conforming products shall not leave the factory. 6.1.2 Type inspection
When the emblem material, emblem paint formula, and production process change, a type inspection shall be carried out. When all quality requirements specified in Chapter 4 are qualified, it is judged to be qualified in type inspection and formal production is allowed. 7 Marking and packaging
7.1 Marking
The name and address of the manufacturer, product number and production date shall be indicated on the back of each regional emblem. 7.2 Packaging
7.2.1 Each regional emblem shall be packaged separately. The packaging should ensure that the quality of the regional emblem is not damaged and is convenient for transportation and storage. The outside of the outer packaging should indicate the product name, specifications, materials, packaging size, weight, name and address of the manufacturer, trademark and number of the national standard implemented, and transportation mark. The outer packaging should be accompanied by the necessary accessories for installation, installation and storage instructions and inspection certificate. The inspection certificate should indicate the regional emblem specifications, materials, product number, factory date, name and address of the manufacturer, trademark, and name (or code) of the inspector. 7.2.2 The packaging of batch regional micros should ensure that the quality of the regional emblem is not damaged and is convenient for transportation. The outside of the packaging should indicate the product name, specifications, materials, quantity, packaging size, weight, name and address of the manufacturer, and transportation mark. ?
GB16690—2008
Appendix A
(Normative Appendix)
Analysis diagram of regional microscopy production in the Hong Kong Special Administrative Region of the People's Republic of China
A1 Make AB equal to CD and intersect vertically at the midpoint. Draw the first circle with this point as the center C and half AB as the radius. Draw a regular five-pointed star inside the circle as an auxiliary line (Figure A.1). Figure A.1
A.2 Draw the second circle with the midpoint of AC as the center C2 and half AC as the radius (Figure A.2). Figure A.2
GB16690—2008
GB16690—2008
A.3 Connect C and C to get the intersection F, and draw the third circle with the midpoint of CF as the center C3 and half CF as the radius. Connect C2 and E to get the intersection G, and draw the fourth circle with the midpoint of GE as the center C and half GE as the radius (Figure A, 3). Figure A.32
Figure 4 Chinese and English standard words on the emblem
5 Test method
5.1 The measurement of the dimensions and allowable errors of the various parts of the standard micro-area should be carried out using qualified measuring tools with an accuracy of not less than 0.5%. 5.2 Chromaticity measurement should be carried out in accordance with the provisions of GB/T3979, GB/T11186.2-1989 and GB/T11186.3-1989. 5.3 The performance of the paint film of the emblem should be measured in accordance with the provisions of GB/T1720, GB/T1733, GB/T1740, GB/T1766, GB/T1771, GB/T6739, GB/T9274 and GB/T9754. 5.4 Strength test
5.4.1 The bending strength test should be carried out in accordance with the provisions of GB/T1449. 5.4.2 Hardness test shall be carried out in accordance with the provisions of GB/T3854. 6
GB16690—2008
5.4.3 Drop ball impact: Place the area emblem sample with the front side facing up and horizontally on the cement floor, and place a steel ball weighing 112g 1m above the sample, so that the steel ball falls freely on the same plane of the emblem surface. Repeat three times, and observe whether the surface of the sample has cracks, deformation, delamination, etc. 5.5 The unevenness test of the emblem surface and micro bottom surface shall be carried out in accordance with the method 4.4b of GB/T11337-2004. 5.6 The non-roundness test of the emblem body shall be carried out in accordance with the two-point measurement method of 2.3 of GB/T4380-2004. 5.7 Appearance evaluation of the emblem surface: It shall be visually evaluated at a distance of 1m from the micro surface under bright natural light; when evaluating under light, a daylight color fluorescent lamp with an illumination of not less than 7501x shall be used.
6 Inspection rules
6.1 Inspection classification
6.1.1 Factory inspection
Each regional emblem product shall be subject to factory inspection before leaving the factory. The contents of factory inspection include the shape, pattern and dimensions of each part of the regional emblem and the quality assessment of the appearance and color of the emblem surface.
When all inspection items are qualified during factory inspection, it is judged as a qualified product, otherwise it is a non-conforming product. Non-conforming products shall not leave the factory. 6.1.2 Type inspection
When the emblem material, emblem paint formula, and production process change, a type inspection shall be carried out. When all quality requirements specified in Chapter 4 are qualified, it is judged to be qualified in type inspection and formal production is allowed. 7 Marking and packaging
7.1 Marking
The name and address of the manufacturer, product number and production date shall be indicated on the back of each regional emblem. 7.2 Packaging
7.2.1 Each regional emblem shall be packaged separately. The packaging should ensure that the quality of the regional emblem is not damaged and is convenient for transportation and storage. The outside of the outer packaging should indicate the product name, specifications, materials, packaging size, weight, name and address of the manufacturer, trademark and number of the national standard implemented, and transportation mark. The outer packaging should be accompanied by the necessary accessories for installation, installation and storage instructions and inspection certificate. The inspection certificate should indicate the regional emblem specifications, materials, product number, factory date, name and address of the manufacturer, trademark, and name (or code) of the inspector. 7.2.2 The packaging of batch regional micros should ensure that the quality of the regional emblem is not damaged and is convenient for transportation. The outside of the packaging should indicate the product name, specifications, materials, quantity, packaging size, weight, name and address of the manufacturer, and transportation mark. ?
GB16690—2008
Appendix A
(Normative Appendix)
Analysis diagram of regional microscopy production in the Hong Kong Special Administrative Region of the People's Republic of China
A1 Make AB equal to CD and intersect vertically at the midpoint. Draw the first circle with this point as the center C and half AB as the radius. Draw a regular five-pointed star inside the circle as an auxiliary line (Figure A.1). Figure A.1
A.2 Draw the second circle with the midpoint of AC as the center C2 and half AC as the radius (Figure A.2). Figure A.2
GB16690—2008
GB16690—2008
A.3 Connect C and C to get the intersection F, and draw the third circle with the midpoint of CF as the center C3 and half CF as the radius. Connect C2 and E to get the intersection G, and draw the fourth circle with the midpoint of GE as the center C and half GE as the radius (Figure A, 3). Figure A.3
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