Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . The following problems are to be solvedby the use of the dividers and rule : Problem I. To bisect (cut in two) astraight line, or an arc of a circle. From tbe ends A B as centers,describe arcs cutting each other at Cand D, and draw C D, which, cuts theline at E or the arc at F. Problem II. To draw a perpendicular to a straight line, ora radial line to a circular arc, Fig. 68. Operate as in theforegoing problem. The line C D is perpendicular to A B ;the line CD i
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . The following problems are to be solvedby the use of the dividers and rule : Problem I. To bisect (cut in two) astraight line, or an arc of a circle. From tbe ends A B as centers,describe arcs cutting each other at Cand D, and draw C D, which, cuts theline at E or the arc at F. Problem II. To draw a perpendicular to a straight line, ora radial line to a circular arc, Fig. 68. Operate as in theforegoing problem. The line C D is perpendicular to A B ;the line CD is also radial to the arc A B. Problem III. To draw a per-pendicular to a straight line, froma given point in that line, With any radius from anygiven point A in the line B C,cut the line A B and C. Next, 1 — ! . «^ A (• C with a longer radius describe arcs Fig. 69. from B and C, cutting each other at D, and draw the perpen dicular D Fig. 70. 2d Method, Fig. 70. From anycenter F above B C, describe a cir-cle passing through the given pointA, and cutting the given line at D;draw D F, and produce it to cutthe circle at E; and draw the per-pendicular A E« Hand Book of Calculations. J39 3d Method, Fig 71. From A describe anarc E C, and from E with the same radius,the arc A C, cutting the other at C ; throughC draw a line E U D and set off CD equalto C E, and through D draw the perpen-dicular A D. JC/ Fig. 71.
Size: 1831px × 1364px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, bookdecade1890, bookpublishernewyorktaudel
