File:A textbook on mechanical and electrical engineering (1902) (14585688497).jpg

Identifier: textbookonmechan00inte (find matches)
Title: A textbook on mechanical and electrical engineering
Year: 1902 (1900s)
Authors: International Correspondence Schools
Subjects: Mechanical drawing Mechanical engineering Electrical engineering
Publisher: Scranton : International Textbook Co.
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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triking the part covered. At the end of thesecond minute, cover parts 2 and 1; at the end of the thirdminute, parts 3, 2, and 1, etc. When twelve minutes areup, part 1 will have been exposed one minute; part 2, twominutes, etc., part 12 having been exposed twelve minutes.Remove the frame to a dark part of the room and tear thestrip so as to divide it into two strips of the same lengthand about half the original width. Wash one of the stripsas before described, and Avhen it has dried, select a goodrich shade of blue, neither too light nor too dark; notice thenumber of the part chosen, and it will indicate the length oftime that the print >vas exposed. Examine carefully thecorresponding part of the other strip, and the correct colorof the edge of the print projecting beyond the tracing isdetermined. All prints should be exposed until this color is § 14 MECHANICAL DRAWING 83 reached, no matter how long or how short the time may be;then they should be immediately taken out and washed.
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Fig. 17 134. In Fig. 17 is shown a patented frame which can beshoved out of the window and adjusted to any angle. WhM. E. y.—i3 en 84 MECHANICAL DRAWING § U not in use. it can be folded up against the wall and occupiesbut little space. It is made in different sizes from 16 X 24to 48X TS. It is one of the best frames in the market,and is placed in such a position relatively to the window thatthe window can be lowered to the top of the main arm. whenit is desired to keep out the cold during the winter. DRAWTSG PLATE, TITLE: SIX-HOKSEPOWERHORIZOXTAE STEA3I EXGI^E 135. Instead of making a finished drawing of thisengine, as in the previous plates, from an exact copy, thestudent is given the rough sketches of the details of a six-lioi-sepoTver liorizontal steam engine, with full dimen-sions marked upon them; from these he is expected to makea general pencil drawing of the engine in two views—a planand a side elevation. The details are not to be drawn. The pencil drawing should then be

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