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).
Specification sheet for enamelled and paper covered copper wire, detailing diameters and covering thickness.
| Identifier | ExFiles\Box 168a\3\ img218 | |
| Date | 1st August 1935 | |
| CONTRACTORS TO THE ADMIRALTY, WAR OFFICE, AIR MINISTRY, POST OFFICE AND COLONIAL GOVERNMENTS THE CONCORDIA ELECTRIC WIRE CO. LTD. Electrical Wire and Cable Manufacturers LONDON OFFICE & STORES 97 MILTON STREET, E.C.2 TELEPHONE METROPOLITAN 9750 TELEGRAMS "POLIANITE, LONDON" NEW SAWLEY Nr. NOTTINGHAM AUGUST, 1935. TELEPHONE LONG EATON 249 (P. B. X.) TELEGRAMS "POLIANITE LONG EATON" CODES A.{Mr Adams} B. C. 5TH EDN. & WESTERN UNION MANUFACTURES Covered Wires. SILK COTTON ENAMEL LACQUER PAPER ETC. Cables V.I.R & LEAD T.R.S. P.B.J. DYNAMO SHOTFIRING TELEPHONE Etc. BELL WIRES "CONSTANTAN" and "CONCORDIN" RESISTANCE WIRES RADIO AND BATTERY CORDS "HERCULACKER" AUTOMOBILE CABLES FUSE WIRES INSULATING MATERIALS ENAMELLED AND PAPER COVERED COPPER WIRE. DIAMETER OF BARE WIRE. TOTAL THICKNESS OF COVERING (ENAM: AND PAPER) IN MILS... .080" 14swg. 4-5 .072" 15swg. 4-5 .064" 16swg. 4-5 .056" 17swg. 4-5 .048" 18swg. 4-5 .040" 19swg. 4 .036" 20swg. 4 .032" 21swg. 4 .028" 22swg. 4 .024" 23swg. 3½ .022" 24swg. 3½ .020" 25swg. 3½ .018" 26swg. 3½ .0164" 27swg. 3 .0148" 28swg. 3 .0136" 29swg. 3 .0124" 30swg. 2¾ .0116" 31swg. 2¾ .0108" 32swg. 2¾ .010" 33swg. 2½ .0092" 34swg. 2½ .0084" 35swg. 2½ .0076" 36swg. 2½ "CONCORD" CABLES AND FLEXIBLES. | ||