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. (1907)
Kolesch & Company · Kolesch & Company · leaf 91
e construction of the stock or body of therule. The rules formerly constructed with celluloid facing on the inside of the grooveonly, are always liable under changes of temperature, climate or humidity to expand,contract or warp, as shown in illustrations below. In the Precision Slide Rule this… … Above cut illustrates the construction of the Precision Slide Rule: a is thewood stock ; b, the celluloid facings ; c, are strips of rubber underlying the scales. Bymeans of these rubber strips the rule becomes self-adjustable, and all further devicesfor adjustment are obviated. The ends of the…
Drawing instruments · Surveying instruments
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