Dent 1916; one of three identical astronomical regulators that in 1869 were ordered by Astronomer Royal George Airy for use in conjunction with transit instruments during British expeditions to observe the Transit of Venus in the years 1874 and 1882. In 1874, '1916' was used at Apua, Honolulu (station B), and is shown in the engraving mounted on its mahogany tripod stand, inside the transit hut. - Dent 1916. The original numbered winding key