Folks,
Boresights and Boresight Telescopes, O.P. 1449, 1949, describes the instruments used to align the gun sights with the guns they aim.
Please report any typos, or particularly annoying layout issues with the Mail Feedback Form for correction.
Richard Pekelney
Webmaster
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BORESIGHTS AND BORESIGHT TELESCOPES
O.P. 1449
TABLE OF CONTENTS
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Chapter 1 |
Page |
INTRODUCTION |
1 |
Types of Boresights |
1 |
Breech Bar Boresights |
1 |
Boresights With Self-Contained Optics |
2 |
Boresighting |
4 |
Boresighting Procedure |
6 |
Sight Alignment |
7 |
References |
8 |
Part 1 |
|
BREECH BAR BORESIGHTS |
15 |
Chapter 2 |
|
BORESIGHT TELESCOPES |
16 |
Introduction |
16 |
Design Factors |
16 |
Notes on Care and Handling |
16 |
Section 1 |
|
TELESCOPE MK 8 MOD 6 (BORESIGHT) |
18 |
Optical Characteristics |
18 |
Description |
18 |
Objective Lens and Draw Tube |
19 |
Crossline Lens and Mount |
19 |
Erecting System and Draw Tube |
19 |
Collective and Eyelenses and Eyepiece Adapter |
20 |
Disassembly, Telescope Mk 8 Mod 6 |
20 |
Routine Before Disassembly |
20 |
Reassembly, Telescope Mk 8 Mod 6 |
27 |
Routine Before Assembly |
27 |
Collimation |
31 |
Section 2 |
|
TELESCOPE MK 75 MODS 0 and 1 (BORESIGHT) |
32 |
Optical Characteristics |
32 |
Description |
33 |
Objective Lens and Body Tube |
34 |
Telescope Draw Tube |
34 |
Crossline and Erecting Lenses |
34 |
Eyelenses and Eyepiece Mount |
35 |
Telescope Mk 75 Mod 0 |
35 |
Disassembly, Telescope Mk 75 Mods 0 and 1 |
35 |
Routine Before Disassembly |
35 |
Reassembly, Telescope Mk 75 Mods 0 and 1 |
41 |
Routine Before Assembly |
41 |
Final Assembly and Collimation, Mods 0 and 1 |
43 |
|
|
Chapter 3 |
Page |
BREECH BAR BORESIGHT EQUIPMENT |
45 |
Introduction |
45 |
Notes on Care and Handling |
45 |
Installation |
46 |
4-inch Boresight Mk 20 Mod 1 |
47 |
5-inch Boresight Mk 29 Mod 0 |
47 |
6-inch Boresight Mk 36 Mod 0 |
48 |
Alignment |
49 |
Part 2 |
|
BORESIGHT WITH SELF-CONTAINED OPTICS |
55 |
Design Factors |
55 |
Notes on Care and Handling |
57 |
Chapter 4 |
|
20-MM BORESIGHTS |
58 |
Notes on Boresighting 20-mm Mounts |
58 |
Section 1 |
|
20-MM BORESIGHT TOOL |
59 |
Optical Characteristics |
59 |
Installation |
60 |
Description |
60 |
Mandrel |
60 |
Weaver Telescope #298 |
60 |
Weaver Telescope #330 |
62 |
Disassembly, 20-mm Boresight Tool |
63 |
Routine Before Disassembly |
63 |
Reassembly, 20-mm Boresight Tool |
67 |
Routine Before Assembly |
67 |
Collimation, #298 |
68 |
Collimation, #330 |
69 |
Section 2 |
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20-MM BORESIGHT MK 1 MOD 0 |
70 |
Optical Characteristics |
70 |
Installation |
71 |
Rear Sight Assembly |
71 |
Front Sight Assembly |
71 |
Removal |
71 |
Description |
73 |
Front Sight Assembly |
73 |
Rear Sight Assembly |
74 |
Disassembly, 20-mm Boresight Mk 1 Mod 0 |
74 |
Routine Before Disassembly |
74 |
Reassembly, 20-mm Boresight Mk 1 Mod 0 |
77 |
Routine Before Assembly |
77 |
Collimation |
78 |
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2
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Section 3 |
Page |
20-MM BORESIGHT MK 3 MOD 0 |
78 |
Optical Characteristics |
79 |
Installation |
79 |
Rear Sight Assembly |
79 |
Front Sight Assembly |
79 |
Removal |
80 |
Description |
80 |
Disassembly, 20-mm Boresight Mk 3 Mod 0 |
81 |
Routine Before Disassembly |
82 |
Reassembly, 20-mm Boresight Mk 3 Mod 0 |
83 |
Routine Before Assembly |
83 |
Collimation |
83 |
Chapter 5 |
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40-MM BORESIGHTS |
84 |
Section 1 |
|
40-MM BORESIGHT MK 1 MOD 0 |
84 |
Optical Characteristics |
84 |
Installation |
86 |
Breech Assembly |
86 |
Muzzle Assembly |
86 |
Removal |
86 |
Description |
87 |
Muzzle Assembly |
87 |
Breech Assembly |
87 |
Disassembly, 40-mm Boresight Mk 1 Mod 0 |
89 |
Routine Before Disassembly |
89 |
Reassembly, 40-mm Boresight Mk 1 Mod 0 |
90 |
Routine Before Assembly |
90 |
Collimation |
91 |
Section 2 |
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40-MM BORESIGHT MK 2 MOD 0 |
92 |
Chapter 6 |
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3-INCH BORESIGHT MK 30 MOD 1 |
93 |
Optical Characteristics |
94 |
Installation |
94 |
Breech Assembly |
94 |
Muzzle Assembly |
95 |
Removal |
96 |
Description |
96 |
Muzzle Assembly |
96 |
Breech Assembly |
97 |
Disassembly, 3-inch Boresight Mk, 30 Mod 1 |
98 |
Routine Before Disassembly |
98 |
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3-INCH BORESIGHT-Continued |
Page |
Reassembly, 3-inch Boresight Mk 30 Mod 1 |
104 |
Routine Before Assembly |
104 |
Collimation |
106 |
Chapter 7 |
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4.2-INCH MORTAR BORESIGHTS |
107 |
Notes On Boresighting 4.2-inch Mortars |
107 |
Section 1 |
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4.2-INCH BORESIGHT (MORTAR) MK 1 MOD 0 |
107 |
Optical Characteristics |
107 |
Installation |
107 |
Removal |
108 |
Description |
108 |
Disassembly, 4.2-inch Boresight (Mortar) Mk 1 Mod 0 |
109 |
Routine Before Disassembly |
109 |
Reassembly, 4.2-inch Boresight (Mortar) Mk 1 Mod 0 |
109 |
Routine Before Assembly |
109 |
Section 2 |
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4.2-INCH BORESIGHT (MORTAR) MK 2 MOD 0 |
111 |
Optical Characteristics |
111 |
Installation |
112 |
Removal |
112 |
Description |
112 |
Telescope Adaptor |
112 |
Telescope Body Assembly |
112 |
Eyepiece Assembly |
114 |
Disassembly, 4.2-inch Boresight (Mortar) Mk 2 Mod 0 |
114 |
Routine Before Disassembly |
114 |
Reassembly, 4.2-inch Boresight (Mortar) Mk 2 Mod 0 |
118 |
Routine Before Assembly |
118 |
Collimation |
120 |
Chapter 8 |
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5-INCH BORESIGHT MK 35 MOD 0 |
121 |
Optical Characteristics |
121 |
Installation |
122 |
Breech Assembly |
122 |
Muzzle Assembly |
122 |
Removal |
123 |
Description |
123 |
Muzzle Assembly |
123 |
Breech Assembly |
123 |
Disassembly, 5-inch Boresight Mk 35 Mod 0 |
125 |
Routine Before Disassembly |
125 |
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3
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5-INCH BORESIGHT-Continued |
Page |
Reassembly, 5-inch Boresight Mk 35 Mod 0 |
128 |
Routine Before Assembly |
128 |
Collimation |
129 |
Chapter 9 |
|
5-INCH BORESIGHT MK 38 MOD 1 |
130 |
Optical Characteristics |
130 |
Installation |
130 |
Breech Assembly |
131 |
Muzzle Assembly |
131 |
Removal |
132 |
Description |
132 |
Muzzle Assembly |
132 |
Breech Assembly |
132 |
Disassembly, 5-inch Boresight Mk 38 Mod 1 |
134 |
Routine Before Disassembly |
134 |
Reassembly, 5-inch Boresight Mk 38 Mod 1 |
137 |
Routine Before Assembly |
137 |
Collimation |
138 |
Chapter 10 |
|
6-INCH BORESIGHT MK 37 MOD 0 |
139 |
Optical Characteristics |
140 |
Installation |
141 |
Muzzle Assembly |
141 |
Breech Assembly |
141 |
Removal |
142 |
Description |
142 |
Muzzle Assembly |
142 |
Breech Assembly Housing |
143 |
Eyelens Mount |
143 |
Disassembly, 6-inch Boresight Mk 37 Mod 0 |
144 |
Routine Before Disassembly |
144 |
Reassembly, 6-inch Boresight Mk 37 Mod 0 |
150 |
Routine Before Assembly |
150 |
Collimation |
152 |
Chapter 11 |
|
8-INCH BORESIGHT MK 31 MOD 0 |
153 |
Optical Characteristics |
153 |
Installation |
154 |
Muzzle Assembly |
154 |
Breech Assembly |
154 |
Removal |
155 |
Description |
155 |
Muzzle Assembly |
155 |
Body Assembly |
156 |
Eyelens Mount |
156 |
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8-INCH BORESIGHT-Continued |
Page |
Disassembly, 8-inch Boresight Mk 31 Mod 0 |
157 |
Routine Before Disassembly |
157 |
Reassembly, 8-inch Boresight Mk 31 Mod 0 |
164 |
Routine Before Assembly |
164 |
Collimation |
166 |
Chapter 12 |
|
NOTES ON MAINTENANCE AND OVERHAUL |
167 |
Shipboard Maintenance |
167 |
Transportation |
167 |
Stowage |
167 |
Handling |
167 |
Shop Handling |
168 |
Disassembly |
168 |
Cleaning Lenses |
169 |
Reassembly |
169 |
Lubrication |
169 |
NUMERICAL LISTING OF PARTS |
170 |
Telescope Mk 8 Mod 6 (Boresight) |
170 |
Telescope Mk 75 Mod 0 (Boresight) |
172 |
Telescope Mk 75 Mod 1 (Boresight) |
173 |
20-mm Boresight Mk 1 Mod 0 |
174 |
20-mm Boresight Mk 3 Mod 0 |
174 |
40-mm Boresight Mk 1 Mod. 0 |
175 |
3-inch Boresight Mk 30 Mod 1 |
176 |
4.2-inch Boresight (Mortar) Mk 1 Mod 0 |
177 |
4.2-inch Boresight (Mortar) Mk 2 Mod 0 |
177 |
5-inch Boresight Mk 35 Mod 0 |
178 |
5-inch Boresight Mk 38 Mod 1 |
179 |
6-inch Boresight Mk 37 Mod 0 |
180 |
8-inch Boresight Mk 31 Mod 0 |
182 |
PRECAUTIONS IN HANDLING BORE-SIGHTS AND BORESIGHT TELESCOPES |
184 |
Table |
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1. Table of Boresights and Mounts With Which They Are Used |
9 |
2. Table of Gun Mounts and Boresights Used With Them |
11 |
3. Optical Characteristics, Boresight Telescopes |
13 |
4. Table of Weights and Sizes of Bore-sights When Stowed in Carrying-Cases |
14 |
5. Optical Characteristics, Boresights With Self-Contained Optics |
14 |
6. Breech Bar Boresights |
45 |
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4
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LIST OF ILLUSTRATIONS
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Figure |
Page |
1. Boresighting 3-inch Mount Mk 27 with 3-inch Boresight Mk 30 Mod 1 |
viii |
2. Telescope Mk 8 Mod 6 (Boresight) |
1 |
3. Typical Boresight Breech Bar |
2 |
4. Typical Boresight Muzzle Disc |
2 |
5. Typical Breech Bar Boresight Installation |
2 |
6. Typical Breech Assembly |
3 |
7. Typical Muzzle Assembly |
4 |
8. Effect of Range on Boresighting |
4 |
9. Mandrel Type Installation |
4 |
10. Typical Self-Contained Optics Installation |
5 |
11. Effect of Sight Misalignment |
5 |
12. Antiaircraft Machine Guns are Bore-sighted at Expected Mean Firing Ranges |
6 |
13. 16-inch Boresight Mk 2 Mod 0 in Carrying Case |
15 |
14. Telescope Mk 75 Mod 1 (Boresight) in Carrying Case |
15 |
15. Telescope Mk 8 Mod 6 (Boresight) |
17 |
16. Optical Diagram-Telescope Mk 8 Mod 6 |
18 |
17. Telescope Mk 8 Mod 6-Cutaway |
19 |
18. Telescope Assembly-Telescope Mk 8 Mod 6 |
21 |
19. Eyepiece Assembly |
22 |
20. Eyepiece Collective Tube Assembly |
23 |
21. Erecting System Draw Tube Assembly |
24 |
22. Body Assembly |
25 |
23. Crossline Housing Assembly |
26 |
24. Objective Draw Tube Assembly |
26 |
25. Adjusting Screw Housing Assembly |
27 |
26. Assembly of Body Tube, Telescope Adaptor and Adjusting Screw Housing |
29 |
27. FinalAssembly-Telescop e Mk 8 Mod 6 |
30 |
28. Telescope Mk 75 Mods 0 and 1 (Bore-sight) |
32 |
29. Optical Diagram-Telescope Mk 75 Mods 0 and 1 |
33 |
30. Telescope Mk 75 Mod 1-Cutaway |
33 |
31. Telescope Mk 75 Mod 0-Partial Cutaway |
34 |
32. Telescope Assembly-Telescope Mk 75 Mods 0 and 1 |
36 |
33. Eyepiece Assembly, Mods 0 and 1 |
38 |
34. Eye lens Mount Assembly, Mods 0 and 1 |
38 |
35. Crossline and Erecting System Draw Tube Assembly, Mod 0 |
39 |
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Figure |
Page |
36. Crossline and Erecting System Draw Tube Assembly, Mod 1 |
40 |
37. Erecting Lens Mount Assemblies Mods 0 and 1 |
41 |
38. Crossline Lens Mount Assembly, Mod 0 |
41 |
39. Breech Bar of 8-inch Boresight Mk 26 Mod 0, Installed |
46 |
40. Installation of Typical Muzzle Disc. |
46 |
41. 5-inch Boresight Mk 29 Mod 0-Breech Adaptor Installed |
47 |
42. 6-inch Boresight Mk 36 Installed for Initial Alignment |
48 |
43. 6-inch Boresight Mk 36-Final Installation for Boresighting |
48 |
44. Adjustment of Crosslines to Muzzle Disc |
50 |
45. 6-inch Boresight Mk 36 Mod 0 |
51 |
46. 3-inch Boresight Mk 18 Mod 0 |
52 |
47. 5-inch Boresight Mk 29 Mod 0 |
52 |
48. 4-inch Boresight Mk 20 Mod 1 |
53 |
49. 5-inch Boresight Mk 25 Mod |
53 |
50. 8-inch Boresights Mk 26 Mod 0 and Mk 30 Mod 0 |
54 |
51. 12-inch Boresight Mk 34 Mod 0, 14-inch Boresight Mk 2 Mod 0, and 16-inch Boresight Mk 2 Mod 0 |
54 |
52. 5-inch Boresight Mk 35 Mod 0 in Carrying Case |
56 |
53. Aligning Gun Sight Mk 14 Mounting Bracket |
58 |
54. 20-mm Boresight Tool |
59 |
55. 20-mm Boresight Tool Installed |
60 |
56. Optical Diagram-Weaver Telescope #298 |
61 |
57. Optical Diagram-Weaver Telescope #330 |
61 |
58. Cutaway-Weaver Telescope #298 |
61 |
59. Cutaway-Weaver Telescope #330 |
62 |
60. 20-mm Boresight Tool Assembly |
63 |
61. Telescope Assembly-Weaver #298 |
64 |
62. Eyepiece and Crosswire Tube Assemblies-Weaver #298 |
65 |
63. Eyepiece and Corsswire Tube Assemblies-Weaver #330 |
66 |
64. Telescope Assembly-Weaver #330 |
67 |
65. 20-mm Boresight Mk 1 Mod 0 |
70 |
66. Optical Diagram-20-mm Boresight Mk 1 Mod 0 |
71 |
67. 20-mm Boresight Mk1 Mod 0-Installed |
72 |
68. Cutaway-20-mm Boresight Mk 1 Mod 0 |
73 |
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5
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Figure |
Page |
69. Rear Sight Assembly |
75 |
70. Telescoping Tube Assembly |
76 |
71. Front Sight Assembly |
77 |
72. 20-mm Boresight Mk 3 Mod 0 |
79 |
73. Optical Diagram-20-mm Boresight Mk 3 Mod 0 |
79 |
74. 20-mm Boresight Mk 3 Mod 0-Installed |
80 |
75. Cutaway-20-mm Boresight Mk 3 Mod 0 |
81 |
76. Rear Sight Assembly |
81 |
77. Front Sight Assembly |
82 |
78. 40-mm Boresight Mk 1 Mod 0 |
85 |
79. Optical Diagram-40-mm Boresight Mk 1 Mod 0 |
85 |
80. 40-mm Boresight Mk 1 Mod 0-Installed |
86 |
81. Cutaway-40-mm Boresight Mk 1 Mod 0 |
87 |
82. Breech Assembly |
88 |
83. Eyelens Mount Assembly |
89 |
84. Muzzle Assembly |
90 |
85. Cutaway-40-mm Boresight Mk 2 Mod 0 |
92 |
86. 40-mm Boresight Mk 2 Mod 0 Installed |
92 |
87. 3-inch Boresight Mk 30 Mod 1 |
93 |
88. Optical Diagram-3-inch Boresight Mk 30 Mod 1 |
94 |
89. 3-inch Boresight Mk 30 Mod 1-Breech Assembly Installed |
95 |
90. 3-inch Boresight Mk 30 Mod 1-Muzzle Assembly Installed |
96 |
91. Cutaway-Muzzle Assembly, 3-inch Boresight Mk 30 Mod 1 |
96 |
92. Cutaway-Breech Assembly, 3-inch Boresight Mk 30 Mod 1 |
97 |
93. Eyepiece Housing Assembly |
99 |
94. Filter and Eyepiece Mount Assemblies |
101 |
95. Body Assembly |
101 |
96. Erecting Lens Mount Adaptor Assembly |
102 |
97. Muzzle Assembly |
103 |
98. Support Arm Assembly |
103 |
99. 4.2-inchBoresight (Mortar) Mk1 Mod 0 |
107 |
100. 4.2-inch Boresight Mk 1-Installed |
108 |
101. Cutaway-4.2-inch Boresight Mk 1 |
108 |
102. Boresight Assembly |
110 |
103. 4.2-inch Boresight (Mortar) Mk2 Mod 0 |
110 |
104. Optical Diagram-4.2-inch Boresight Mk 2 |
111 |
105. 4.2-inch Boresight Mk 2-Installed |
112 |
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Figure |
Page |
106. Cutaway-4.2-inch Boresight Mk 2 |
113 |
107. Telescope Assembly |
115 |
108. Sleeve Assembly |
116 |
109. Eyepiece Assembly |
116 |
110. Telescope Adaptor Assembly |
118 |
111. 5-inch Boresight Mk 35 Mod 0 |
121 |
112. Optical Diagram-5-inch Boresight Mk 35 Mod 0 |
122 |
113. 5-inch Boresight Mk 36 Mod 0-Installed |
123 |
114. Cutaway-5-inch Boresight Mk 35 Mod 0 |
124 |
115. Breech Assembly |
125 |
116. Muzzle Assembly |
127 |
117. 5-inch Boresight Mk 38 Mod 1 |
130 |
118. Optical Diagram-5-inch Boresight Mk 38 Mod 1 |
131 |
119. 5-inch Boresight Mk 38 Mod 1-Installed |
132 |
120. Cutaway-5-inch Boresight Mk 38 Mod 1 |
133 |
121. Breech Assembly |
134 |
122. Muzzle Assembly |
136 |
123. 6-inch Boresight Mk 37 Mod 0 |
139 |
124. Optical Diagram-6-inch Boresight Mk 37 Mod 0 |
140 |
125. 6-inch Boresight Mk 37 Mod 0-Installed |
141 |
126. Cutaway-6-inch Boresight Mk 37 Mod 0 |
143 |
127. Breech End Housing Assembly |
145 |
128. Eyelens Mount Assembly |
147 |
129. Dove Prism Mount and Filter Mount Assemblies |
149 |
130. Muzzle Assembly |
149 |
131. 8-inch Boresight Mk 31 Mod 0 |
153 |
132. Optical Diagram-8-inch Boresight Mk 31 Mod 0 |
154 |
133. 8-inch Boresight Mk 31 Mod 0-Installed |
155 |
134. Cutaway-Muzzle Assembly, 8-inch Boresight Mk 31 Mod 0 |
156 |
135. Cutaway-Breech Assembly, 8-inch Boresight Mk 31 Mod 0 |
157 |
136. Breech Assembly |
158 |
137. Eyelens Mount Assembly |
159 |
138. Dove Prism Mount and Filter Mount Assemblies |
161 |
139. Crossline Lens Mount Assembly |
162 |
140. Body Assembly |
162 |
141. Muzzle Assembly |
164 |
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