A text book of geometrical drawing, for the use of mechanics and schools, in which the definitions and rules of geometry are familiarly explained (1849)
rally found on the plane scale which accom-panies a set of drawing instruments, and marked C, or Ch. Note 2.—Any scale of chords may be reconstructed by using the chord of60° as a radius for describing the quadrant. Application.—Problem 31. Fig. 2. To lay down an Jingle at ¥y of any number of… … SCALES OF EOrylL FA UTS. W 9 8 7 6 5 4 3 2 10 0223456789 10 J5
