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Bausch & Lomb 1908 catalog of Engineering Instruments

2-A 5" Transit

The construction of an instrument of precision, with all the modem improvements, is an expensive undertaking, and the price depends upon the accuracy and perfection of the work. Believing that a large number of engineers would be glad to equip themselves with a highly serviceable instrument, supplied at a very moderate price, we introduce this new 5 inch transit No. 36. It is not to be understood that any details have been slighted, because the price is low the instrument is simply not so complete, and the aperture of the optical parts not so large as in the No. 40.

But in every particular, and point of detail, this transit surpasses the transits commonly sold today at a higher price. The construction is of the most improved type, hard bronze being the metal employed. The centers are long, all fittings are accurate, and the graduations are of extreme precision.

Our continuous variation plate, and the sensitive levels with graduations on the vials, are included, as in our other transits. The plate levels are adjustable from without, but are mounted within the com pass box for protection. The telescope is of erecting pattern, with standard eyepiece. However, our patented variable power eyepiece may be substituted if desired.

The finish of the instrument is both durable and handsome, and where price is a primary consideration, the 5 inch transit No. 36 seeks its peer. An instrument at this price duplicating the efficiency and offering the same advantages possessed by the No. 36 has never been produced.

Other Specifications

The horizontal circle has a diameter inside of graduation of 5 1/2 inches and an outside diameter of 6 1/2 inches The graduations read to single minutes by double opposite verniers. The circle is figured as in Fig. V. page 10. The vertical arc is 5" in diameter, and also reads to single minutes by one double vernier. The compass needle (see page 9) is 3 7/8" in length, mounted upon a center of selected agate. The erecting telescope is 10 1/2" long, with a power of 20 diameters, effective aperture 1 3/16", and an apparent field of view 30 degrees.

The telescope level is 4 1/2" in length and is graduated in 2 mm. divisions, each division representing 20" of arc. The plate levels are also graduated in 2 mm. divisions, each division being sensitive to 6o" of arc. The telescope axis carries a center-point which is exactly over the center when the instrument is leveled up and the telescope is horizontal. The axis is also provided with clamp and tangent screw. The range of the shifting center is 1/2". The four German silver leveling screws are provided with dust-caps.

The instrument is 11 1/2" in height and weighs approximately 13 1/2 lbs. The approximate weight in carrying case is 23 1/2 lbs., and when ready for shipment 37 lbs. The ordinary tripod weighs about 8 3/4 lbs., and when packed 23 lbs. The extension tripod weighs 10 lbs., and when ready to ship 24 1/2 lbs.

Cat No. Description Price
36 5" Transit, as specified, including vertical arc, level to the telescope, clamp and tangent screw, and split-leg tripod . . . . . . . . . . . . . . . . . .. . 180.00
38 5" Transit, as above, but without vertical arc . . . . . . . . . . . . . 165.00
39 5" Transit, without vertical arc, level to telescope and tangent screw . . . . . . . . 145.00
Gradienter, for 5" transit . . . . . . 5.00

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