Aeronautic Instruments. Section V : Power Plant Instruments (1923)
NASA Technical Reports Server (NTRS) · leaf 32
n detachable instrument boards fastened to the wall of the chamber. The rigid or flexible connections with the driving apparatus pass through a hole in the wall or door of the chamber. In the case of the instrument boards the tachometers are held in place simply by pins and wooden buttons to… … Fig. 3.—Apparatus used in vibration tests. electric heater shown in figure 4, the lower temperature by brine circulating in the radiator, A fan insures reasonable uniformity of temperature throughout the chamber. The procedure in determining the error is exactly the same as at room temperature. A…
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