| Description | Written from 1 Hillside Crescent, Edinburgh. The letter includes a detailed and illustrated description of the instrument stand that Piazzi Smyth has developed for use at sea. The letter describes the physical and mechanical principles behind the device and is illustrated with various sketches. Following the letter is a document titled Plan of a Prec'n of Equinoxes Stand which describes in detail and with diagrams the precise components of the stand with details of their diameter and construction so that it can be replicated by Brunel's workmen. The description also details, in some cases, how the device is intended to work or be used. |