| Country of Origin | United Kingdom |
|---|---|
| Sub-Type | Optical square |
| Type | Scientific Instruments |
| Period | 1800 to 1900 |
| Material | Brass |
Check the listing for details. Antique Norton & Gregory large optical square in leather case.. Condition: Used, Made in United Kingdom. Listed at 161.70 USD. There are also the initials W.R.M who was presumably a previous owner. There is a twist action to close all apertures when not in use, and the two drums can be dismantled for cleaning & adjusting the mirrors by simply unscrewing the retaining screw on the side and pulling the two halves apart.
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