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Description: | This instrument consists of a diameter cut away and two vertical sight vanes, with a horizontal one between. The diameter has a crossbar at centre which holds a raised section to accommodate the compass spigot. the back sight vane is a wide slit; it has two spring clips attached to it. The fore sight is an open arch with a thread, which travels along the diameter. The horizontal vane has both wide and narrow slits. There are also raised and inverted V sghts on top of the vertical vanes.
A
caption: Record Shot - Do not reproduce. | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | alidades | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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