1. During the Second World War, the equatorial mount and transit circle were lost. 2. He possessed several valuable instruments, among which was one of Troughton's best transit circles . 3. The prime meridian passes through the transit circle ( ) of the Greenwich observatory. 4. When the observatory was built, he used a Jones Mural Circle and a Dolland Transit Circle . 5. Thereupon he rejoined the Naval Observatory, and began working in the 6 " Transit Circle Division. 6. Following the death of Martins, the Repsolds again took the lead and made many transit circles . 7. He created the Groombridge Transit Circle in 1806, which Stephen Groombridge used to compile his star catalogue. 8. Between 1967 & ndash; 69 he assisted in positional observations with the observatory's 7 " transit circle . 9. When the Airy transit circle was built, a mercury basin was used to align the telescope to the perpendicular. 10. The meridian chosen was that which passed through the Airy transit circle at Greenwich and it became the prime meridian.
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