A Course in Mechanical Drawing

Cover A Course in Mechanical Drawing
A Course in Mechanical Drawing
John S John Simpson Reid
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Of the point a.
If another line is projected through the point a per. To the V. P. Until it pierces the V. P. In the point a", a is the ver- tical projection of the point a.
If now the V. P. Is revolved upon its axis I. L. In the di- rection of the arrow until it coincides with the H. P. And let the H. P. Be conceived to coincide with the plane of the drawing-paper, the projections of the point a will appear as shown by Fig. 108.
The vertical projection d 4" above the I. L. And the horizontal p
...rojection a h 3" below the I. L. Both in the same straight line.
In mechanical drawing the vertical projection a" is called the Elevation and the horizontal projection a h the Plan.
The projections of a line are found in a similar manner, by first finding the projections of the two ends of the line, and joining them with a straight line.
Let ab be a line in space 3^" long, parallel to the V. P. And perpendicular to the H. P. One end is resting on the H. P. 2\" from the V. P.
The points a and b will be vertically projected in the points a v and b".


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