Fig. 24. THE NEXT STEP IN ISOMETRIC PERSPECTIVE DRAWING
To show to a better advantage how isometric perspective works out look at Fig. 25 and you will see how the bearings of a crankshaft of a four cylinder gas engine stand out in a vertical line, up and down and in a horizontal line right and left as though they were real and made in three dimensions.
Fig. 25. A CRANK SHAFT DRAWN ON ISOMETRIC PAPER
How to Make Isometric Paper.—To make isometric perspective drawings you can get along without the cross-section paper described above though this is the easiest and most accurate way to get results.
But you can make these drawings on any kind of paper if you know how to use a protractor and measure of 30 degrees. To do it right you should have some drawing tools and if you are an inventor you should have them anyway.
Drawing Tools You Need.—For making drawings of any kind you should by all means have a drawing-board as shown at A in Fig. 26. As a drawing board must be perfectly square and made so that it cannot warp it is better to buy one of a dealer in drawing materials.
Fig. 26a. A DRAWING BOARD
A good board is built up of thoroughly seasoned strips of white pine glued together and fitted with end ledges; a small board say 12 by 17 inches on the sides can be bought for 50 cents or a little more and it will serve you well. A 12 inch triangular boxwood architect’s scale is shown at B in Fig. 26 and is much handier to use than a common rule.