Cooke 25 inch Tested

 

On November 5^th 1867 the 25 inch object glass which had been so long in the making by Thomas Cooke of York was completed. 

This was the largest object glass to that date. It was tested on the double star gamma 2 Andromeda and the stars were seen most distinctly divided and with the spurious disks of the three stars of the system perfectly round.