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. . iers at 30 degrees to the telescope, read-ing to 30 seconds (see page 201). Ground glass shades attached to bothverniers. Compass, divided on solid silver to half-degrees, with improved barneedle, 2 inch. With variation plate and capstan head for setting same. Vertical Circle, 4 inches, graduated on solid silver to 30 minutes, withvernier reading to 60 seconds. Weight of instrument without tripod,
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. . iers at 30 degrees to the telescope, read-ing to 30 seconds (see page 201). Ground glass shades attached to bothverniers. Compass, divided on solid silver to half-degrees, with improved barneedle, 2 inch. With variation plate and capstan head for setting same. Vertical Circle, 4 inches, graduated on solid silver to 30 minutes, withvernier reading to 60 seconds. Weight of instrument without tripod, about 9J/2 lbs. Instrument complete, in finely polished box, with plumb bob,reading glass, center key, adjusting pins, gossamer bag and tripodNo. 7400 each, $ Optional Additions to Above Transit, To Order Only. 20 seconds verniers, instead of 30 seconds $ Astronomical (inverting) eye-piece, instead of erecting Three leveling arms, instead of four arms Magnifying glasses, attached to verniers on limb plate 60 seconds verniers at same price as No. 7560. ®°OUR IRON CLAD GUARANTEE, see page 196. 21 8 KOLESCH <fc CO. &Hp^ NEW YORK, (Extra Fine Quality Transit. 7600 u Extra Fine Quality Transit. (For description see page 219.) KOLESCH «&c CO. 1STEW YORK. 219 Kolesch Transit No. 7600 Extra Fine Quality. 7600 Extra Fine Quality Transit, for high-grade work requiring ex-treme accuracy and precision. Bent Standards. With powerful achromaticterrestrial (erecting) telescope about 11 inches long. Magnifyingpower 24 diameters. Will focus 5 or 6 feet from the instrument, which is veryconvenient on short offsets. Lenses are especially made and selected by thebest European optical works. Aperture of object glass 1 3/16 inches. DustCap and Sun Shade. Improved rack and pinion movement to eye-pieceand objective. Fine bubble (4*4 in. vial) of 30 seconds sensitiveness, grad-uated on the glass and attached to the extreme end of telescope. Thisposition of the bubble
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Keywords: ., bookcentury1900, bookdecade1910, bookidillustratedc, bookyear1917
