Copy, letter from David Gill, Royal Observatory, Cape of Good Hope, to Warren De la Rue Lays out an estimated cost of the telescope and observatory for the Cape of Good Hope. Suggests that a canvas covered observatory is unwise given the frequent brush fires and the burning down of the Magnetic Observatory nearby. Proposes a dome such as that in Vienna. Estimates costs of construction, material, labour and transport.p65. 6 June 1880