Excerpt from The Second Course of Orthographic Projection: Being a Continuation of the New Method of Teaching the Science of Mechanical and Engineering Drawing
I have to thank my esteemed friend, Mr. William Rye, the Mayor of Oldham - Messrs. Robert Wood and Sons, of Leeds - Messrs. Ormrod, Grierson, and Co., of Manchester - Messrs. Robinson, Cooks, and Co., of St. Helen's, Lancashire, and other eminent men who have kindly furnished me with details of the various methods now in use for describing the teeth of wheels, from which I have, without materially altering that form which is acknowledged to be the best, endeavoured to° introduce a form Of tooth that shall be universal.
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