+
-
Alidade
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.
For more information about using images from our Collection, please contact RMG Images.
Object Details
| ID: | ACO0715 |
|---|---|
| Type: | Alidade |
| Display location: | Not on display |
| Creator: | L. Doignon & Malakoff |
| Date made: | 19th century |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 142 mm x 190 mm x 28 mm |
Your Request
If an item is shown as “offsite”, please allow eight days for your order to be processed. For further information, please contact Archive staff:
Email: library@rmg.co.uk
Tel: +44 (0)20 8312 6516 (during Library opening hours)
Click “Continue” below to continue processing your order with the Library team.