This is a Broadhurst Clarkson & Co. telescope which was possibly produced in or before WW1. The telescope consists of a main brass tube with large 57mm objective lens, a single focusing brass tube, and a long eyepiece tube with lenses at both ends. This telescope is in good working order, ideal for practical use and for collection. Magnification estimated around 20x or slightly higher.
Marks on the brass eyepiece ring:
63 FARRINGDON Rd. E.C.
CLARKSON & CO
Marks on the objective lens ring:
No. 23B IOIN. E F
Objective lens diameter: 57mm
One-draw (3 sections) brass tubes.
Telescope length when extended at focus: approx. 58cm (23 in.) (Note: distant image can be focused when the focusing tube is pulled out only a short distance from the main tube, so no need to pull it furthermore).
Telescope length when compacted: 52cm (20.5 in.) (Note: the main telescope section is around 29cm. The three brass tubes can be easily disconnected when not in use).
Magnification: estimated around 20x or higher
Main body diameter at front: 7cm (2.8 in.)
Weight: approx. 1.6 kg
Wear and tear to the brass tube surfaces appropriate with age and use. There are no dents to the brass tubes and no damage to the lenses.
All internal lenses have been cleaned. The telescope gives clear images.
This telescope was probably produced before or during WW1.
Here is a brief introduction to Broadhurst Clarkson & Co.
This telescope model is very rare and so far this is perhaps the only one available in the market.
Please see photos for further details.
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