International Library of Technology · Scranton, International Textbook Co. · leaf 110
where a door is being continually openedand shut. Also place it where it will not be exposed todampness, an unusual amount of dust, or chemical fumes ofany kind. 114. Testing Meters.—Recording wattmeters shouldbe checked up with a standard direct-reading meter occa-sionally to see if they record… … fig. 47. chalk mark is made on the meter disk, so that the revolu-tions may be easily counted, and the revolutions are taken for40 to 60 seconds, the observer using a stop watch. Anotherobserver reads the standard instrument, and the load is keptas nearly constant as possible throughout the test.…
Electrical engineering
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