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Bausch & Lomb 1908 catalog of Engineering Instruments

Standard 6" Transit

This instrument resembles the No. 40 transit in many respects, differing principally in size. It is designed for very accurate work, and when a few pounds of additional weight are not objectionable. The large diameter of the objective particularly adapts this instrument for city surveys, since it permits work to be done under unfavorable atmospheric conditions. The magnifying power is quickly adjusted by means of the variable power eyepiece to suit the state of the atmosphere, low powers being used under unfavorable conditions, so that the objective gives a clearly defined field well illuminated. While the telescope as regularly furnished is erecting, an inverting telescope will be sup plied if desired. The design includes the continuous variation plate, and the plate levels mounted inside the compass box. All centers have long bearings, insuring great accuracy.

Other Specifications

The horizontal circle inside the graduations is 6 3/16 in diameter; outside 7 1/8". The graduations read to single minutes by double opposite verniers. The vertical arc is 5" in diameter, and reads to single minutes by one double vernier. The compass needle (see page 9) is 4 1/2" long, with a sapphire center.

When furnished with erecting telescope, the telescope has the following dimensions: length 11 1/2", power with variable power eyepiece 20 to 30, effective aperture 1 1/2" and an apparent field of 30 degrees.

Inverting telescope if desired will have the following specifications: length 12", power 22 or 36 as ordered, effective aperture 1 1/2", and an apparent field of 36 degrees.

The telescope level is 4 3/4" long, with 2 mm. divisions, each having a value of 20" of arc. The plate levels are graduated similarly, with divisions equal to 60" 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 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.; the weight in carrying case is 32 lbs., and when packed for shipment 48 lbs. The ordinary tripod weighs approximately 11 lbs., and 23 lbs. when packed. The extension tripod weighs 11 1/2 lbs., or 23 1/2 lbs. when ready for shipment.

60 Standard 6" Transit, as specified, including the variable power eyepiece and the vernier to the vertical arc, adjustable by a fine tangent screw, and the position of the vernier controlled by a very sensitive level attached to the arm. As illustrated on page 30, and including the split-leg tripod . . . . 265.00
62 Standard 6" Transit,as specified, with variable power eyepiece and with a full vertical circle 5" in diameter, with metal guard and graduated to read to single minutes by two double opposite verniers attached to the cover guard. ( See illustration on page 8). With split-leg tripod . . . . . . . 260.00
64 Standard 6" Transit, with variable power eyepiece and with the full vertical circle with guard, read by one double vemier placed between the standards, as illustrated on page 26, and with split-leg tripod . . . . . . . . . . 250.00
66 Standard 6" Transit,as specified. including variable power eye piece, vertical arc, telescope level and split-leg tripod (see illustration on page 25) . . . . . . . . 240.00
68 Standard 6" Transit, as above, but without vertical arc . 225.00

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