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).
Diagram sheet for the Hobson K-S Telegage fuel gauge, showing its components and operation.
| Identifier | ExFiles\Box 44\4\ Scan109 | |
| Date | 1st February 1930 guessed | |
| Diagram Sheet FOR THE HOBSON K-S TELEGAGE MADE BY H.{Arthur M. Hanbury - Head Complaints} M.{Mr Moon / Mr Moore} HOBSON, LIMITED Telegrams: "ASSEMBLAGE, LONDON." Telephone: "Chiswick 4231 (4 lines.) 47/55, THE VALE, ACTON, LONDON, W. 3. BRITISH MADE Fig. 1.—Tank Unit. Labels: Air Line Connection, Vent Hole, Air Cup, Hole D, Air Delivery Tube, Vent Tube, Air Tube, Air Chamber, Hole C, Bell Plate. Fig. 2.—Head. Labels: Glass Tube, Red Liquid, Air Line, Brass Tube, Lock Nut, Calibrating Wire, Flexible Metal Tube. Fig. 3. Telegage in Operation, Tank Empty. Labels: U-Tube, FULL, EMPTY, Connection, Special Red Liquid, Air Line, Air Tube, Petrol Tank, Air Chamber. Figures 3 and 4 show a simple Telegage. The Air Cup and Air Delivery Tube have been omitted as they take no part in the reading of the gauge. They are simply used as a means of supplying air to the Air Chamber to overcome any loss by absorption. Fig. 4. Telegage in Operation, Tank full. Labels: U-Tube, FULL, EMPTY, Connection, Liquid, Air Line, Air Tube, Petrol Tank, Air Chamber. If one of the connections are opened while the tank contains Petrol the trapped air will escape and petrol will rise in the Tank Unit to the same level as in the tank. Similarly the Liquid in the U-tube will fall until the same level has been reached in both sides, which should be at the “Empty” mark. Now, if the connection is again made, the gauge will still read “Empty” until the Air Chamber and Air Tube are cleared of petrol and again filled with air. This is accomplished by the surge of the petrol as explained in the “Correction Sheet” under “Check No. 1” (THIS IS NOT THE CORRECTION SHEET.) | ||