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).
Letter from Harrison Radiator Corporation regarding the composition and application of solder for Prestone radiators.
| Identifier | ExFiles\Box 173\2\ img041 | |
| Date | 16th February 1934 | |
| HARRISON RADIATOR CORPORATION LOCKPORT, NEW YORK February 16, 1934 Mr. W. A.{Mr Adams} Robotham Detroit Athletic Club Detroit, Michigan Dear Mr. Robotham: Answering your wire of February 15th, the latest, and so far, the best solder which we have used for Prestone radiators is a mixture of lead with 5% to 6% silver, the silver being .9995 fineness. This will result in a solder having a shearing strength of 1500 pounds per square inch at 350°F.{Mr Friese} This has a melting point range of from 580° to 700°F and the temperature of application should not exceed 850°F when soldering hard drawn brass or copper. The preferable bath temperature for dipping shall not be in excess of 850° and a variation of more than 15°F from the center to the outer edges of the bath will not product satisfactory results. Under no circumstances should the core be redipped. Excess solder may be removed by using a torch and small leaks that occur can be repaired by either a torch or a solder iron. Trust this is the information you desire. If not please let me know and will do my best to supply what you wish. Best wishes for a safe journey back to England. With kindest personal regards. Yours very truly L. P. Saunders L. P. Saunders LPS:C HEAT TRANSFER PRODUCTS AVIATION - AUTOMOTIVE - INDUSTRIAL RADIATORS - SHUTTERS - OIL TEMPERATURE REGULATORS - CAR HEATERS - THERMOSTATS - CONDENSERS | ||