Babbit, Arthur B · New York, H. Holt and company · leaf 14
roll—The scroll is made in several varieties andis used as a ruhng edge for curves where thecompasses cannot be employed.Pencils—The degree of hardnessof a drawing pencil is shown bythe number of times the letter Happears on the wooden covering,or by the numeral that precedesthe H. The larger the… … ///. J 4 MECHANICAL DRAWING Pencil-sharpener—Either a pencil file or block ofsandpaper is necessary for sharpening the lead ofthe pencil. The former is preferable. Thumb-tacks—Thumb-tacks with small headsshould be selected, as they interfere less with themovement of the T square. Drawing ink—An…
Mechanical drawing
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