4 0 c m
31cm
actual image size: 23cm x 32cm
Description
This instrument, devised in 1954 and made by Hilger and Watts, is extremely compact in comparison with earlier designs and, at 9 pounds in weight, considerably lighter. The telescope is sufficiently short to allow it to swivel completely over from back to front, allowing a very quick method of correcting for irregularities in the circles and supports.
Image Details
Image Ref.
10280184
© Science Museum / Science & Society Picture Library