A text book of geometrical drawing : abridged from the octavo edition : for the use of schools in which the definitions and rules of geometry are familiarly explained, the practical problems are arranged from the most simple to the more complex, and in their description technicalities are avoided as much as possible : with an introduction to isometrical drawing : and an essay on linear perspective and shadows ... (1849)
D … PLATE VI. 29 This mode is used by workmen when they desire tomake a piece of wood round for a roller, or any otherpurpose; it is first made square, and the diagonalsdrawn across the end ; the distance of one half the di-agonal is then set off, as from G to jR in the diagram,and a guage set from H…
