The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 245
The length which I have given to the arms of the parallel motion,is just sufficient to allow the pencil to travel over the board. Thelimit of the motion to the right will be found to be that the arras Q Qwill come into contact, and thus prevent farther motion in that direction; and similarly the… … ^tSS^E^ S
Architecture · Civil engineering · Science
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