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Excerpt from Illustrated Architectural, Engineering,& Mechanical Drawing-Book: For the Use of Schools, Students, and Artisans
IN the work on Practical Geometry, in the Series of Educational Books of which this treatise forms a part, we have given simple definitions and con structions of the various forms and figures which may be said to constitute the foundation of all drawing. We have there endeavoured to show that a knowledge of geometrical construction is necessary, before a thorough appreciation of the principles of outline sketching can be Obtained, and a ready facility acquired in performing its operations. However much this position may be controverted as regards its application to an art which is generally looked upon as independent of, rather than dependent on, strict and formal rules, there can be no doubt, we think, that it holds with all completeness in reference to that which it is now our duty to illustrate and describe. In fact, so much do the various branches treated of in the following pages depend upon a knowledge of geometry, that many class them under the generic title of geometrical drawing. Those com mencing the study of these arts - so useful to the architect and the mechanic - without this knowledge of geometry, will be disappointed as to their speedy proficiency, and will labour under great disadvantages, from not understanding the principles upon which the constructions are founded.
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