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).
Comparison of the operation and adjustments for a voltmeter, mentor, and automatic switch.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 23 | |
| Date | 27th October 1926 | |
| PC.118. 27.10.26. COMPARISON OF VOLTMETER, MENTOR, AND AUTOMATIC SWITCH. Adjustments of Units. Taking the reading of the voltmeter unit as the basis of comparison, the automatic switch, in a vertical position, was adjusted to operate at 14.5 volts when cold (18°C). The Mentor, also in a vertical position, was adjusted to operate at 15.8 volts when at a final temperature attained by prolonged running at 15.8 volts, a voltmeter being used in place of the lamp in the first instance, in order to obtain a more precise action. Observations on operation. Switch. With the above setting, and at the temperature attained by prolonged running on 17.0 volts, this unit opens at 16.1 volts, and closes again at 9.8 volts. Mentor. With the above setting this unit commences to operate (the lamp flickers) at 15.8 volts, and operates fully at 16.0 volts. It ceases to operate a short time after lowering the volts to 15.8. Voltmeter, Mentor, and Switch. When fully warmed up, and working normally, the operation of the three units taken together is as follows:- (1) Switching on. Voltmeter indicates state of charge of battery. (2) Starting up. Cutout operates and battery charges. (3) Voltmeter shews rise of volts to about 16.0. Switch and Mentor operate (the Mentor is usually a little late). (4) Operation of the auto-switch reduces the output. (5) Slowing down. Voltmeter indicates falling volts. (6) Further slowing down. Cutout comes off. (7) Finally switch closes at 9.8 volts. Contd. | ||