A scale drawing makes it easier to visualize and work with objects of systems that are very large or very small. The key decision is determining the scale, i.e., the ratio between the dimensions of the object and the scale drawing.
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The advantage of taking the lowest mark on the main scale as the zero mark over the centre-zero is that it covers for all the errors that may happen.
garnish
Oh, dude, Cavalier and Cabinet Oblique Sketching are both ways to draw 3D objects on a 2D surface, like paper. The main difference is that in Cavalier, the object is drawn with true dimensions in all three axes, while in Cabinet Oblique, one axis is foreshortened to make the drawing look more realistic. It's like deciding whether to draw a pizza box straight on or at a cool angle - both get the job done, just with a different vibe.
That is extremely simple. Think about it next time if 1ft = 3cm then 18ft = 3cm x 18 which then equals 54cm so the main mast on the model sail boat will be 54cm
LC= Value of one main scale division Total number of divisions on vernier