"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . No. i8.—Air Pump Complete. (Draw to a scale of 2 in. =1 ft.)in. diameter. Stroke. 42 in, Air pump stroke, o , rt- _ -^ cylinder capacityRule Air pump capacity = ?— ^ ^? Then, Air pump diameter = /Z4_254f_—: ^ 24, say 25 in, —7854 cancels out top and bottom. Rule, Diameter of pump rod

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"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . No. i8.—Air Pump Complete. (Draw to a scale of 2 in. =1 ft.)in. diameter. Stroke. 42 in, Air pump stroke, o , rt- _ -^ cylinder capacityRule Air pump capacity = ?— ^ ^? Then, Air pump diameter = /Z4_254f_—: ^ 24, say 25 in, —7854 cancels out top and bottom. Rule, Diameter of pump rod = Dieter of pump^.e. Then, „ „ „ = ^-S+.6 = 3-37 i , s»y 3* in- 9 Rule, Thickness of barrel = Diameter_of_pump + .3. Then, „ „ „ = ^ + .3 = in., say J in- Length of barrel /ns/rfe = Stroke + Bucket + Valve depth-t-Clearani = 20 + 5 in- + 3! +2 i- NnTK.—Allow, say, I in. clearance top and bottom. Then to find 4 then,Allow d»Allow pitThen, Then,.

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