Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 380
1531/. REFLECTING DRAW-ING BOARD.—A vertical plate ofglass in a frame on a drawing board.The picture on one side and a plainsheet of paper on the other side ofthe glass. On looking into theglass on one side the picture isplainly projected on the other, andcan be readily traced with a pencil. … 1531^. SELF REGIS-TERING BAROMETER.—Four aneroid disks are con-nected in series and in contactwith the lever R and linked tothe index lever L, its endholding a pencil that marksthe variation of pressure on tHe graduated paper on a drum driven by a clock. 370 DRAUGHTING DEVICES. 1531/L DOTTING…
Mechanical movements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
