. Industrial Education Magazine . in many respects superior to the old form of solidchuck generally used. After the first piece of 1board has been turned to the desired size and theface trued up, fit four or more strips of 1 stock tothe circular disk with IX or \y2 screws, allowingabout X on the ends towards the center for turn-ing to the desired size of circle. In this chuck theboy has a chance to try several times on the samepiece, as the first or large circular disk is not cut,and new strips may be added at any time to replacethe ones that are of no further use. One maindisk will serve a bo
. Industrial Education Magazine . in many respects superior to the old form of solidchuck generally used. After the first piece of 1board has been turned to the desired size and theface trued up, fit four or more strips of 1 stock tothe circular disk with IX or \y2 screws, allowingabout X on the ends towards the center for turn-ing to the desired size of circle. In this chuck theboy has a chance to try several times on the samepiece, as the first or large circular disk is not cut,and new strips may be added at any time to replacethe ones that are of no further use. One maindisk will serve a boy for the course and will provevery SECTION OF A PROPELLER OK AFRENCH AEROPLANE In building up the laminated black, silk clothwas glued in between some of the layers i woodto give added strength. CURRENT PUBLICATIONS The Universal Sheet Metal Pattern Cutter. ByWilliam Neubeaker. The Sheet Metal Publica-tion Co., 154 Nassau St., New York, N. Y., 9 x 11>^ in.; 380 pages, 681 diagrams and otherillustrations; price, $ This is Volume I of a comprehensive treatise onall branches of sheet-metal pattern begins with the use of drawing instruments,definitions and geometric problems. Then followsthe intersection of solids and the development otsurfaces treated under three divisions: (a) parallelline developments, (b) radial line developments(conical surfaces) and (c) triangulation. In eachdivision the principle is applied to sheet-metalforms. After these, marine sheet-metal work, auto-mobile sheet-metal work, guards for machinery,and articles made of heavy metal are book also includes s
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