Titolo: Notes on Mechanical Drawing Introductory to Machine Design Arranged for Students in the Lewis Institute Classic Reprint
Editore: Forgotten Books
Data di pubblicazione: 2018
Lingua: Inglese
ISBN 10: 133417508X
ISBN 13: 9781334175084
Rilegatura: PAP
Condizione: New
Peso: 104 grammi

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Riassunto

Excerpt from Notes on Mechanical Drawing: Introductory to Machine Design; Arranged for Students in the Lewis Institute

The T square should be slightly longer than the drawing board and without swivel head. One of good quality pear wood is quite satis factory but more elaborate ones can be had. The head of the T square is apt to swell from a true surface where it slides along the edge of the board. This may be corrected by occasionally scraping away the bowed part.

The compasses should be the large size supplied with pencil and pen legs and adjustable needle'point. Large dividers usually come with sets but are not very necessary. A set of bow instruments; bow dividers, bow pen and bow pencil, complete the necessary tools. The last two instruments may be' had combined in one instrument whose needle point remains stationary while the pen or pencil leg is twirled around it.

This instrument, well made, is, for small circles, preferable to the old type of bow instruments.

The pen usually called the right line pen should be about six inches long and with spring blade but no hinge.

The catalogs of makers of, and dealers in, drawing instruments offer considerable information regarding the construction and care of instruments.

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