1638. Scale attachment, metallic for reading telescope

1639. Attachment for Resolving Power of Telecope comprising an optical slit which can be fitted over the Telescope objective, so as to bring the jaws in close proximity to the lens surface. Stainless steel slit with unilateral jaw movement through a Screw reading displacement Very precise and highly accurate. Without Telescope.

1640. Attachment for Resolving Power of Telescope.
The slit opening in this case is however read on a micrometer head.

1641. Astronomical Telescope
Optics-Achromatic 50 mm. dia.
Eye piece-High powered.
Focussing-Smooth rack and pinion.
Construction: The tube holding the objective and eye piece is mounted on a clamp with universal m 0 v e men t having a slow motion arrangement for horizontal & vertical plane.
Stand: A very sturdy three legged Telescopic, Magnification 40 x to 48 x .
Special features: 1. The main telescopic tube is fitted with a dummy sight tube, which facilitates in bringing theobject in focus plane- by viewing through the dummy tube-. This arrangement eliminates the wastage of time in trying to bring the object in focus. The slow motion arrangement makes the objects to be viewed from all angles.

1642. Terrestrial Telescope Same as above but with built in erector.

1643. Astronomical and Terrestrial Telescope Combined with an extra erector tube which can be screwed into the main tube after removing. Astro eye-piece and thus the astronomical telescope is used as the Terrestrial Day Telescope Complete in box as above.

1644. Stand for Astronomical Telescope
Having telescopic legs and with slow motion arrangement.

1645. Cathetometer 20cm.
This instrument consists of a brass bar mounted on an iron tripod base, fitted with a small circular spirit level. The scale is divided into half millimeters for 25cm. on one side of the bar and is read by a vernier. The slide that carries the telescope is free to move along the whole of the scale and can be clamped where required and fine adjustment is made by the Micrometer Screw at the top.
General Specification
Telescope-Rack and pinion focussing with achromatic objective and a 10x ramsden eyepiece with cross line reticule.
Range of Telescope : Without auxiliary lens in position 36 inches to infinity.
Thus the instrument has a focus of 36 es to infinity. Vernier reading. .01, .005, .002, or .001 cms (however we supply. 001 cms).


inches to infinity. Vernier reading. .01, .005, .002, or .001 cms (however we supply. 001 cms).
Cathetometer as described without auxiliary lens.

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