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).
Page 3 of a document detailing the operation and specifications of a recording instrument and a 'TEL' Accelerometer.
| Identifier | ExFiles\Box 113\2\ scan0166 | |
| Date | 11th November 1930 guessed | |
| -3- The length of a roll of transparent paper is about 30 metres, which, with a forward feed of, for example, 2 m/m per metre, allows of the measurement of a course of 10 km. or with a feed of 1 m/m a course of 20 km. To avoid useless consumption of paper, the winder is fitted with a clutch. The Clutch is engaged or disengaged simply by operating the lever on the front of the instrument on the left (Fig. 2). The recording stylus is automatically lifted from the chart when disengagement is effected, and, therefore, only the diagram desired is recorded. The maximum length of chart which can be wound is about 10 metres, it is, therefore, necessary to remove the recorded chart after each record has been made as the winder spool cannot contain the full length of 30 metres. To ensure the chart being securely drawn, it is necessary to fold the end of the paper twice to a length of about 2 cm. In this way, 4 layers of paper are gripped under the holder of the winder, this being absolutely necessary to secure the band. General Particulars. The "TEL" Accelerometer weighs about 8.2 lbs. Its size is - about 300 m/m high, 130 m/m wide, and 110 m/m deep. (Fig. 3). The drive is effected by means of a flexible shaft, and the maximum revolutions per minute at the driving shaft may be anything from 500 to 2,500 revolutions per minute for the maximum graduation of the dial. Normally the revolutions per minute at the driving shaft correspond to 1 revolution per metre or yard. For the revolution counters, the normal ratios are 1.1, 1.2, or 1.4, the driving shaft running at a lower speed. The direction of rotation of the driving shaft may be either way, our instrument being fitted with a change-over device. The drive is interchangeable. The most generally useful fitting is our universal joint coupling permitting the instrument to be driven from any angle. | ||