A Treatise on Military Surveying, Theoretical and Practical: Including a Description of Surveying Instruments

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D. Van Nostrand, 1864 - 193 páginas
 

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Página 72 - A, about sixteen inches square, having its upper edge rabbeted, to receive a boxwood frame, B, which being accurately fitted, can be placed on the board in any position, with either face upwards. This frame is intended both to stretch and retain the drawing paper upon the board, which it does by being simply pressed down into its place upon the paper, which for this purpose must be cut a little larger than the board. One face of the frame is divided...

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