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 | ||