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Bausch & Lomb 1908 catalog of Engineering Instruments

City Engineers' 6" Transit
with U-Standards

In many varieties of work the compass is not required, especially in city surveys, and greater lateral strength and stiffness is gained by the use of U-standards. To provide engineers with a thoroughly reliable instrument, we have designed this new transit with U-standards. The workmanship throughout is of the highest order, and every part is made with great care. The telescope can be very readily lifted from its wyes and reversed.

This transit is provided with vertical arc, or with full vertical circle with one or two verniers, or without either, as may be desired. The instrument is recommended especially for city and tunnel work, and for other operations requiring the projection of a straight line.

Other Specifications

The diameter of the horizontal circle inside of graduations is 6 3/16" the outside diameter is 7 1/8". The circle is graduated to read to single minutes by double opposite verniers. The vertical arc is 5" in diameter, and reads to single minutes by one double vernier. When the transit is furnished with an erecting telescope, it has the following specifications: length 11 1/2" power with variable power eyepiece 20 to 30, effective aperture 1 1/2" apparent field 30 degrees.

The following specifications apply to the inverting telescope, which will be supplied in place of the erecting pattern if desired: length 12", power 22 or 36, as ordered; effective aperture 1 1/2", apparent field 36 degrees.

The level to the telescope is 4 3/4" long, and is graduated in 2 mm. divisions, each division being sensitive to 20" of arc. The standard levels are also graduated in 2 mm. divisions, each division equalling 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 German silver leveling screws are provided with dust-caps. The Saegmuller solar attachment is capable of being used as an auxiliary to the telescope for vertical sighting.

The instrument is 13 5/8" in height, and weighs approximately 17 lbs.; in carrying case the approximate weight is 32 lbs., and the complete instrument ready for shipment weighs 48 lbs. The ordinary tripod weighs 11 lbs., and approximately 23 lbs. when packed for shipment. The extension weighs 1/2 lb. more than the ordinary form.

Cat. DESCRIPTION Price
72 6" Transit, with U-standards, having a full vertical circle 5" in diameter, protected by a metal cover-guard and reading to single minutes by two double opposite verniers, which are attached to the guard. With split-leg tripod . . . . . 250.00
74 6" Transit, with U-standards, and with the full vertical circle read by one double vernier placed between the standards. Including the split-leg tripod . . . . . . 240.00
76 6" Transit, with vertical arc, and with astronomical eyepiece, attached level, clamp and tangent. The vernier is adjustable concentrically with the circle by two opposing screws as illustrated. Erecting eyepiece will be supplied at the same price, the variable power eyepiece at an extra charge. With split-leg tripod (as illustrated on page 34) . . . . 230.00
78 6" Transit, with U-standards, but without vertical arc; otherwise as specified, and with split-leg tripod . . . . . 215.00
Control Level to vernier of vertical arc . . . 25.00

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