The making of circles was shortly afterwards taken up by Edward Troughton, who in 1806 constructed the first modern transit circle for Groombridge's observatory at Blackheath, but he afterwards abandoned the idea, and designed the mural circle to take the place of the mural quadrant.
The making of circles was shortly afterwards taken up by Edward Troughton. Edward Troughton in 1806 constructed the first modern transit circle for Groombridge's observatory at Blackheath. He afterwards abandoned the idea. He afterwards designed the mural circle. This was to take the place of the mural quadrant.