Rolls-Royce Archives
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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Bill of materials listing the weights required to manufacture a 40 mm gun, excluding the mounting.

Identifier  ExFiles\Box 176\3\  img105
Date  17th July 1940 guessed
  
WEIGHT OF RAW MATERIAL REQUIRED TO MAKE 1 - 40 mm. GUN.
(LESS MOUNTING.)

MATERIAL SPECIFICATION.
S/M - BSS. S77
S/N - BSS. S69
S/ZN - BSS. S67
S/NCR- 4 - S - 11
S/ZNCR - BSS S - 82
V.C.M. DTD 228
V.C.M. S.28
VIBRAC V-30 STEEL
AMT 50 - 4% C. STEEL
S/GS - DTD 5A
" " - S 65
VIBRAC - BARREL STEEL
CAST IRON
A/F - BSS L- 40
A/C - DTD 133 B.
BZ/PC - BSS - 2-B-8
BZ/G - BSS - 2-B-2
COPPER - BSS T - 7
RUBBER - OIL RESISTING
BRASS - BSS - 3 - B - 12
BZ/AF DTD.164

WEIGHT OF RAW MATERIAL.
72 lbs.
52 "
40 "
160 "
12 "
20 "
1 "
32 "
4 "
5 "
1 "
700 " (Handwritten correction: 450)
4 "
68 "
200 "
14 "
2 "
6 "
1 "
14 "
1 "

TOTAL = 1399 lbs.

Handwritten notes:
E.38. 50 Tons / ☐" MIN YIELD
Actual Wt of Barrel 450 LBS
Forging (50 Guns)
Previous 1 off forgings 400 LBS
  
  


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