Aeronautic Instruments. Section V : Power Plant Instruments (1923)
NASA Technical Reports Server (NTRS) · leaf 29
t is a 36-inch Veeder, Form H-4, liquid centrifugal tachometer. This instrument contains colored kerosene and has a paddle wheel in the base which, as it rotates, drives the liquid up in a vertical glass tube. The speed is determined by the position of the meniscus on a scale graduated in… … Fig. 2.—Multiple connection stands. perature, leakage, and inaccuracy in the setting of the zero, though not negligible, are of no serious consequence in the testing of airplane tachometers, which are read ordinarily to five revolutions per minute only. OTHER APPARATUS. Another method of testing…
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