Mr W U Jones of Bushey Heath ,Herts ordered in 1866 a transit instrument from Thomas Cooke, I don't know the size of the OG but I can guess it was a 3 inch., which was a fairly standard size .
The following year 1867 he ordered 4 friction wheels and tramway for an observatory which had a 10 feet and 4.5 inch inside diameter. The wheels had to be no more than 8 inches in diameter.
www.theramblingastronomer.co.uk
No comments:
Post a Comment