Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U. S. seacoast defenses .. (1904)
United States. War Dept · Washington, Govt. print. off. · leaf 162
153. Anemometer. MISCELLANEOUS APPARATUS. 113 To obtain the velocity from the self-register take the number of spaces andparts of spaces between the mile marks i-ecordecl in the five minutes precedingthe time of observation and multiply the result by twelve.
Electric machinery · Searchlights · Coast defenses
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
