|
Date: |
|
Description: | W. BOOSMAN. AMSTERDAM
Dry compass
Card: Mica covered with paper, white with black markings. It is a double card with the outer rim graduated quadrantally in degrees. The inner moveable portion is graduated to half points with decorated N & E points, and is turned by a brass collar at the centre of the card to allow for the variation and show the true course, while the outer rim shows magnetic.
Needle: 7.9" (20.0 cm) long, flat bar needle painted red, with square ends and a slightly expanded centre.
Pivot: Conical brass pivot cup, with jewel at the top, screwed through the centre of the needle and brass card-turning collar at the centre of the card.
Inscription.
caption: Record Shot - Do not reproduce. | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
|
|