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).
Extruded copper tubes for radiators, including pricing and manufacturing methods.
| Identifier | ExFiles\Box 38\2\ Scan155 | |
| Date | 8th August 1921 | |
| R.H. 135A (100 T) (S & H.{Arthur M. Hanbury - Head Complaints} 782. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 X3456 R.{Sir Henry Royce} from Wd.{Mr Wood/Mr Whitehead} c. to GJ. c. to Hs.{Lord Ernest Hives - Chair} c. to Hy.{Tom Haldenby - Plant Engineer} X 3456 (crossed out) X 3678 Wd{Mr Wood/Mr Whitehead}8/NJS.8.8.21. Re Extruded Copper Tubes for Radiators. In response to R's letter, R5/G11.4.21, to Ms., Rolls-Royce of America Inc. sent us:- 18,927 Copper Radiator Tubes .268" x 4-3/4" 149 lbs. @ dollars 0.90 per lb. = dollars 134.10 At the present rate of exchange (say dollars 3.60 per £.sterling) this price is equal to 5/- per lb. and we calculate that said tubes will actually cost us more delivered here than tubes produced in England. We are just in receipt of a letter from RR.of A,Inc. stating that these tubes have been produced by "squirting", this being a modified process of extrusion which consists of placing the metal in a crank press and forcing it over a mandrel on the inside and a die on the outside with one revolution of the crank. It is explained that this system was very successfully used during the War in producing shrapnel shell tubes and is the scheme now followed by the U.S.Cartridge Co. who have produced the copper tubes supplied to us; so far it has not been possible to employ this process for anything but copper tubes, this on account of the thin wall, but experiments are now being made with brass. RR.of A.Inc. state that the tubes they are employing for their radiators are made of brass, drawn by the cartridge process. [STAMP: RECEIVED, 8 AUG 1921] | ||