W. Jones, The Warren, Bushey Heath, Herts ordered in 1866 a transit instrument from Thomas Cooke & Sons, I don't know the size of the OG.
In 1867 he ordered 4 friction wheels which had to be not more than 8 inches in diameter and tramway for his observatory which was 10 feet and 4.5 inches wide.
I assume that the observatory was for a telescope as transit were usually housed in a transit room.
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