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).
Test report and critique of a sample L.P.M.A. Syringe Hydrometer.
| Identifier | ExFiles\Box 44\5\ Scan082 | |
| Date | 16th November 1925 | |
| EFC. JB.132. 16.11.25. L.P.M.A. SYRINGE HYDROMETER. This hydrometer was sent here for test as a sample from the L.P.M.A. Co. Birmingham to BY/HM{Capt. W. Hallam - Head Repairs}2/K121125. The general remarks re this instrument are as follows :- (1) The glass barrel is drawn down at the middle in the same way as the early Exide type and is notably weak at this point, in fact a very suggestive crack is eminent, if not actually one. It will be remembered that this occurred on the Exide in a number of instances. (2) The barrel at the top is drawn down to a very small dia. to permit the rubber bulb to be fitted over, when acid is drawn into the bulb or the hydrometer is inverted, and if sufficient acid is drawn into it, the float goes into this small hole at the top and jams, and of course, could be very easily broken in getting it out. (3) The rubber stopper which carries the rubber nozzel or tube is not secured in a very satisfactory way and could be improved. (4) The graduations on the float are not sufficient to enable accurate readings to be taken as it is only graduated at 1100, 1150, 1175, 1215, 1250, 1280, 1300, and any intermediate readings have to be judged, and again it only reads up to 1300, and would be much nicer if it could be read up to 1340. (5) When the acid is being released from the hydrometer the float drops and covers up the hole in the stopper and prevents the passage of acid, this necessarily needs some modification. (6) The readings are .020 low at 1.300 but are correct at 1.100. This hydrometer although it is 6d. cheaper than the present one we are having, it is not worth changing over as it has not any good points over the Exide. EFC/GJ. | ||