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. . telescope, and are protected byglass covers. Ground glass shades attached to the verniers of all transitsNos. 7500 to 7673. The verniers of Solid Silver on our stock transits Nos. 7500-7673 readto 30 seconds (see cut, page 201). Other divisions to order at short notice. 200 KOLESCH <fc CO. NEW YORK. The Cross and Stadia Hairs in our telescopes are of the best web,uniform in thickness, and are re
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. . telescope, and are protected byglass covers. Ground glass shades attached to the verniers of all transitsNos. 7500 to 7673. The verniers of Solid Silver on our stock transits Nos. 7500-7673 readto 30 seconds (see cut, page 201). Other divisions to order at short notice. 200 KOLESCH <fc CO. NEW YORK. The Cross and Stadia Hairs in our telescopes are of the best web,uniform in thickness, and are reliable under all atmospheric conditions. AllStadia Hairs are set to read on a leveling rod exactly one foot for a distanceof 100 feet, but are adjustable for any other distance. Gradienter Attachments will be furnished with our instruments when-ever required. The Gradienter is a special tangent screw attached to theclamp of the telescope axis; it is divided into 50 parts, one complete revolu-tion of the screw corresponding to one foot in fifty feet distance; fractionsof one foot being easily read by the division of the screw. We use Cloth Finish on all our instruments. Other finish to Style A—The above cut represents the lower plate with the divisionsand numbering used on all of our stock transits. Numbered in two rowsfrom 0°-360° and from 360°-0°, the slant of the figures denoting the direc-tion. Inner row of figures is placed on Solid Silver, and the outer rowon the adjacent phosphor bronze of the limb plate. This arrangement makesit almost impossible to make an error in reading. Can furnish to order any of the following styles of divisions:Style B—Lower limb plate numbered on inner row 0°-180° and back180°-0°. Outer row from 190°-360°. Style C—Inner row in quadrants 0°-90°-0° right and left from row, 0°-360o. KOLESCII <fc CO. (&*lp\ NEW YORK. 2or Verniers The following types of verniers are the ones most generally used, andas they are f
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Keywords: ., bookcentury1900, bookdecade1910, bookidillustratedc, bookyear1917
