Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 64
than if it were obscured by heavycrosslines. At the same time the outer heavy lines help to locatethe center of the field. The stadia scale in a surveyors transit isessentially a scale for establishing a constant small angle. Theobserver reads through the transit the length of the stadia rod… … B
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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