Description: Four-prism Spectrograph
Used at the Cape Observatory on the Victoria Telescope between 1903 to 1926.
-Laing, J.D. (ed.), The Royal Observatory at the Cape of Good Hope 1820 – 1970 Sesquicentennial Offerings, pp.30.
Description: Browning Spectrograph
Edward Stone decided to try his hand at spectroscopy. He brought with him to the Cape Observatory his own spectroscope made by Browning. This instrument was fitted to the Mertz 7-inch telescope. However, the mounting on the telescope was too weak. He ordered a stronger mounting and an improved spectroscope. The stronger mounting arrived in 1874, but is unknown if the new spectroscope ever arrived at the Cape.
As for the Browning spectroscope, Stone took this instrument along on an expedition to Namaqualand to observe the total solar eclipse of 16 April 1874. He mounted the spectroscope on a 4-inch telescope that he borrowed and made the first ever scientific spectroscopic observations in Southern Africa.
-Warner, B., Astronomers at the Royal Observatory Cape of Good Hope, p.76