Optical Shop
Polishing Bowl
Edging Machine
Null Tester
Tube Fittings
Worm Drives
Optical Workshop Equipment
Spindle Nose & Adaptors
Slip Ring Seting Circle
Mirror Cell
Odds and Ends



This is my resign of Mirrcr Call. It ;s simple but it provides very little adjustment. As I machine the ends of the tulle square and grind the back or the mirrors to give even thickness a s not necessary. Also the mirror is located on its front face. Mirrors differed in thickness and each cell was machined to suit. A small amount of adjustment to hold the mirror against the retaining washers on the side support pillars is provided by The vinyl cads with the gruo screw behind them.

The end ring forms part of the cell and it and the top end ring are machined from the same casting. The three pillars and wasners ;hat hold and locate the mirror are machined from hard black nylon rod. The pillars are machined out 'o suit each mirror. Adjustment for alignment is by compressing the neoprene `0" nngs between the mirror holding elate and the end ring. There is very little adjustment but I have round that this was all that was necessary.

However with the mirror cell fixed in the tube. the positioning of the focussung unit is very critical. Holes cannot be cut 5y trial and error until right. I therefore made a modified cell for others to use who do not have my facilities. With provision for variation in mirror thickness and where it can be moved up the tube until the correct position is found. However a separate end ring is required to give the telescope a finished look.