The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 321
ame supports a horizontal frame b, which is sus-pended by cords and weights c c. in such manner as to be capable of beingraised and lowered at pleasure ; at d there are two standards, supporting aplate of glass d placed at an angle, e e is also another rectangular frame sup- rting a frame ,/,/,… … Iosite direction to the frame// or at right angles to it; this frame, i?jf, alsocarries a plate of glass i, U[on which the design to be copied is placed; theobject of these moveable Irames is to bring the various parts of the subject ordesign immediately below the rays of light which pass through…
Architecture · Civil engineering · Science
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