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).
Testing on thermostatically operated shutters using a bellows without a spring.
| Identifier | ExFiles\Box 39\4\ Scan241 | |
| Date | 11th April 1931 | |
| To BY.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to E.{Mr Elliott - Chief Engineer} 83499 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/MJ.11.4.31. THERMOSTATICALLY OPERATED SHUTTERS. In order to take advantage of the fact that we do not use a spring in our thermostats we have been testing out a bellows which is made up in the compressed state before being filled with fluid. The result of this is that should the bellows at any time become punctured there is a very slight load which is equal to the spring in the bellows tending to open the shutters. We send herewith a curve which shews the best results which have so far been obtained. This, we consider, is better than nothing and as it does not alter the function of the Calorstat otherwise we are asking the manufacturers to incorporate the modification into their production deliveries. We hope eventually to do better than this, but the net result of the effort is that we can say that there will be a slight tendency for the shutters to open should the bellows puncture at any time. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||