[3] With a reflecting mirror 36 inches wide (91 cm) and a focal length of 4.57 meters (15 ft), it was the largest telescope in use at the Observatory in Greenwich until the late 1950s.

[1] The Yapp dome building was taken down and sent to the Royal Observatory, Cape of Good Hope to house the planned Elizabeth telescope.

[6] An example of astronomical studies done with Yapp reflector, is Spectroscopic Observations of the Be Stars η Cen, γ Cas and Φ Per.

[8] The results were published in the 1985 research paper High dispersion spectroscopy trials using an echelle spectrograph with CCD camera.

[11] This was one of the biggest at Herstmonceux until the 98-inch Isaac Newton Telescope was commissioned in 1967, which was moved to La Palma island off the coast of Spain by the 1980s.