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Heavy cast aluminium alloy base integral with collimator tube support. Both the collimator and telescope have 175mm focal length and 25mm aperture object glass at their one ends. The collimator has precision slit and telescope an 8X Ramsden’s eye-piece at their other ends. Focusing is done by helical action device. The scale 175mm diameter is divided in degrees
and is read to 0.1 degree (6 minutes of arc) with the help of the vernier fixed to the telescope arm. The scale can be rotated through 180° and locked in any desired position. The telescope has both the coarse and fine adjustment for exact readings. The prism table, 75mm diameter, has screwed holes for fixing prism and grating holders. It has lines marked to assist placing
of prism with respect of table levelling screws. Prism holder can accommodate prisms up to 38mm high. Supplied with prism holder, grating holder and tommy bar for adjustment of optical axis. |
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