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)
pitch line towardthe centre, and on the tops of the teeth describe epicy-cloids. Note.—^The circumferences of circles are directly as their di-ameters; if the diameter of one circle be four times greater thananother, the circumference will also be four times greater. Fig. 2 is another method for… … 16 In 14 I.-. 7 2 11 lO ^y f} 7 a ,-> -1- .-? 2 j /. I L /i .] .7 6 17 /;, ^V^-^
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