MacDonald, Alexander Forsyth, 1897-1965 · Port Credit, Ont. : Aviation Service Corporation · leaf 41
of transit. The re-flected wave is combined with some of the outgoingwave in the plane receiver, and the difference, or beatfrequency, is measured by a Frequency Meter. Sincethe reading of the meter is that of the beat frequency,it is proportional to the time delay of the echo — henceto the height… … fig. H, Pioneer Airspeed Indicator. Fig. 34. Pioneer Vertical Speed Indicator. Theory of Flighl 37 The AIRSPEED INDICATOR tells the pilot the speedat which he is travelling through the air (not over theground). The dial is calibrated in miles per hour, orknots (Fig. 33). The Airspeed Indicator…
Airplanes
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