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Chronometric Type Speed Indicators
The Chronometric Type Speed Indicators are contact style instruments that measure the average number of revolutions per minute. After a short interval of 3 or 6 seconds of testing time, the pointers automatically stop at positions which indicate the measured speed.
The dial of these instruments has a black numbered scale that reads directly in revolutions per minute. Surface speeds in feet per minute are obtained by using the supplied 6-in. (152 mm) circumference wheel and dividing the scale reading by 2. An optional 12-in. (304-mm) circumference wheel is available to obtain direct feet per minute readings.
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