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Bausch & Lomb 1908 catalog of Engineering Instruments
The peculiar shape of the standards allows a much longer needle to be used than is possible with the other models of 4" transits. The needle of this instrument is 3 inches in length.
The continuous variation plate is another advantageous feature of construction. The unlimited range resulting is appreciated by all engineers. The long center gives great accuracy.
The resolving power of the telescope is in keeping with the accuracy of the graduations and the sensitiveness of the levels; it is supplied either with erecting or astronomical eyepiece, both constructions transiting through.
The level vials are very precisely ground to a uniform curvature, and the plate levels are mounted inside of the compass box, but are adjustable from without. They are thus protected from breakage, and are most efficient. The vernier of the vertical circle may be easily and quickly adjusted laterally by means of two screws, the movement of the vernier being always concentric with the circle.
The standards and cover guard of the vertical circle are finished in a handsome black leather finish. while the other parts are in heavily lacquered brass or bright black enamel. If desired, the telescope will be finished in the so-called cloth finish. The black leather finish mentioned above is strongly recommended, being durable and handsome.
Horizontal circle, diameter inside of graduations 4 1/4 inch, outside diameter 4 7/8". The circle is graduated to read to single minutes by double opposite verniers. Vertical circle, diameter 4 inches graduated to read to single minutes by one double vernier. Compass needle, (see page 9) length 3". The erecting telescope is 7 3/4" in length, has a power of 12 diameters, effective aperture of 1 inch and an apparent field of 30 degrees.
The telescope level is 3 3/8 inches long, and is graduated on the vial in 2 mm. divisions, each division being sensitive to 30" of arc. The plate levels are 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 provided with clamp and tangent screw. The range of the shifting center is 9/16 inches. German silver leveling screws with dust-caps.
The height of the instrument is 9", and the approximate weight 6 3/4 lbs. The approximate weight in carrying case is 15 lbs., and when packed for shipment 25 lbs. The approximate weight of the ordinary tripod is 7 lbs., and when packed for shipment 19 lbs. The weights of the extension tripod are 8 1/2 and 21 lbs., respectively.
|Naze||14||4" Mining and Reconnoissance Transit, as specified and illustrated on page 14, with full vertical circle, protected by an aluminum guard, and read by one double vernier mounted between the standards, including extension tripod . . . . . . . .||200.00|
|Nacre||16||4" Mining and Reconnoissance Transit, as illustrated on page 15 with vertical arc, without guard, including extension tripod . . . . . . . . . .||190.00|
|Nadder||18||4" Mining and Reconnoissance Transit, without vertical arc or circle, otherwise as specified, and including extension tripod . . . . . . . . .||175.00|
|Naggy||Gradienter, for 4" Transit.. . . . . . . .||5.00|
|Nall||Eyepiece Prism, with colored sun-glass . . . . . .||6.50|
|Neogen||Fixed Stadias, 1:100 . . . . . . . . . .||3.00|
|Nam||Adjustable Stadias, in place of fixed stadias . . . . . . . .||10.00|
|Nanga||Fixed, but Disappearing Stadias . . . . . . . . .||5.00|
|Naos||Saegmuller Quick-leveling Head (see page 2) . . . .||10.00|
|Nape||Illuminator for Cross Wires, consisting of a tube with reflector, which is used in place of a sunshade over the objective end of the telescope . .||4.00|
|If split-leg tripod is preferred to the extension tripod listed with the above outfits, $.5.oo may be deducted for it.
As noted in the specifications, the horizontal circle reads to single minutes. If graduations are desired reading to 30", add $10.00.
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