Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U.S. seacoast defenses (1902)
United States. War Dept, Anderson, George Lucius, 1849-1934 · Washington, Govt. Print. Off. · leaf 159
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 recorded 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.
