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Farnborough ("Farnboro") electric indicator, made by Dobbie McInnes Ltd.
Measures cylinder pressure by recording the balance point, the time at which a certain cylinder pressure balances standard air pressure. The record or diagram is obtained by rotating a sheet of paper at engine speed or one-half engine speed in the air-gap such that the spark in going to earth must perforate this paper.
Details
- Category:
- Motive Power
- Object Number:
- Y1988.128
- Materials:
- metal (unknown) and wood (unidentified)
- Measurements:
-
overall: 460 mm x 610 mm x 315 mm,
- type:
- electric indicator
- credit:
- Gift of Central Electricity Generating Board