Illustrated catalogue and price-list of drawing and tracing papers, sun print papers and equipments, drawing instruments and materials, surveying instruments, accessories, etc / Kolesch & Company. . Pig. L Pig. II Above cuts illustrate the latest improved SEL FAD JUSTING construc-tion of the Precision Slide Rule, 1 he unshaded parts denote the stripsof white celluloid, the ends of which are fastened to the wood by GermanSilver screws, insuring absolute adherence to the body of the rule. The shaded parts, as shown in cuts, denote the mahogany stock builtup in sections to prevent warping. The ru
Illustrated catalogue and price-list of drawing and tracing papers, sun print papers and equipments, drawing instruments and materials, surveying instruments, accessories, etc / Kolesch & Company. . Pig. L Pig. II Above cuts illustrate the latest improved SEL FAD JUSTING construc-tion of the Precision Slide Rule, 1 he unshaded parts denote the stripsof white celluloid, the ends of which are fastened to the wood by GermanSilver screws, insuring absolute adherence to the body of the rule. The shaded parts, as shown in cuts, denote the mahogany stock builtup in sections to prevent warping. The rule has imbedded in its interior, three concealed tempered steelsprings made of the very finest of material; one near each end of therule, and one in the center. Fig. I illustrates the saw cut through the entire length of the ruleand shows the steel spring passing through the saw cut from one side ofthe solid stock to the other. Fig. II illustrates the position of the steel spring, with the rule cutopen at the point where the central spring passes through the body ofthe rule. Each spring is fitted tightly into its respective partition, avoiding alllateral play. This simple but effective const
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Keywords: ., bookcentury1900, bookdecade1910, bookidillustratedc, bookyear1917
