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).
Failures of Cambridge Thermometers and comparing them to the superior Foxboro' instruments.
| Identifier | ExFiles\Box 175\4\ img005 | |
| Date | 10th February 1921 | |
| R.{Sir Henry Royce} 255A (100 T) (S. H.{Arthur M. Hanbury - Head Complaints} 798. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1047 x3897 To By from Hs.{Lord Ernest Hives - Chair} c. to EP.{G. Eric Platford - Chief Quality Engineer} Hs{Lord Ernest Hives - Chair}4/LG10.2.21. X.3565. X.3903. RE THERMOMETERS. X.13563. We have had three or four cases of failures with the Cambridge Thermometers of the soldered joint breaking away. Whilst I was in the U.S.A. they showed to me a number of Cambridge Thermometers which had failed. They are, of course, in a worse position than we are because it is impossible to get them repaired. They showed to me a Thermometer made by the Foxboro' Company which is equivalent to the Cambridge instrument. The joints on the Foxboro' Thermometer were very much better carried out, also at the point were the joints occurred, they had armoured the tubing somwhat it was impossible to kink it at the joint. They had also got, what I considered, a very good method for fixing the bulb into the water pipe. On the bulb is a coned face similar to a union. The joint was made in exactly similar way to what an ordinary union water joint is made. The advantage of this joint is that as soon as the nut is turned, the bulb is loose and there is no tendency for it to be twisted round. The Foxboro' instrument is also very good for reading deadbeat. We have had several Cambridge instruments in which the needle has vibrated. With reference to the question of fitting Thermometers to our cars again. I took this matterup with R.{Sir Henry Royce} and he thought the best way was to design a Contd. | ||