Catalogue of Keuffel & Esser co., manufacturers and importers drawing materials, surveying instruments, measuring tapes Review
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ... in. astronomical (inverting) telescope each $ Note. Instrument No. 5003 A, made to order only. For other Dumpy Levels, see pages 314 and 319. ENGINEER'S Y LEVELS. (See also general description, page 275.) 5005. Engineer's Y Level. Telescope 15 in., achromatic terrestrial, with dust cap and sunshade. OBJECT GLASS 1T in., focused by improved rack and pinion movement. EYEPIECE, erecting, with improved microm ter focusing arrangement with resetting scale. MAGNIFYING POWER 24 diameters. Fine SPIRIT LEVEL to telescope, graduated on the glass and ground to a sensitiveness of about 20 seconds of arc per graduation. Level tube adjustable vertically and horizontally. Level Bar of gun metal, improved construction, of great strength and rigidity, shaped to offer least resistance to the wind. One Y can be raised or lowered and is provided with an ADJUSTABLE HINGED STOP for placing the telescope with the cross hairs in a vertical and horizontal position. The Y's are locked by a patented arrangement dispensing with pinbolts. Center of hard bell metal, carefully fitted. Improved CLAMP and TANGENT SCREW with counterspring. Tangent and Leveling Screws of nickel silver. Four leveling screws. Morocco Finish. Instrument complete with adjusting pins, waterproof cover, etc., in fine polished mahogany Box and with No. 5178N Split Tripod each $ Weight of instrument about lbs. Weight of tripod about 11 lbs. 5010. Engineer's Y Level, like No. 5005, but telescope 18 in., object glass 1f in., MAGNIFYING POWER 28 diameters, with No. 5178 N fiplit Tripod each f Weight of instrument about 11 lbs. Weight of tripod about 11 lbs. 5012. Engineer's Y Level, like No. 5005, but telescope 21 in., object glass If in, MAGNIFYING POWER 32 diameters, with No. 5178N Split Tripod each $ Weight of inst... Read more...
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