+
-
Open Quadrant
An open quadrant 4.25" (10.8cm) radius, mounted on a base 7" (17.8cm) long, with its apex at top and with one side vertical. A moveable pointer 3.75" (9.5cm) long is attached at the apex by a milled brass knob, a plumb line and bob is suspended from the knob. Graduations: the arc of the quadrant is graduated on the inner and one outer edge 0-90, 90-0 degs.
A level is used to determine a horizontal line. Determining a series of level lines at differing heights allows comparitive altitudes to be calculated.
A level is used to determine a horizontal line. Determining a series of level lines at differing heights allows comparitive altitudes to be calculated.
For more information about using images from our Collection, please contact RMG Images.
Object Details
| ID: | NAV1428 |
|---|---|
| Type: | Level |
| Display location: | Not on display |
| Creator: | Baradelle, Pere |
| Date made: | circa 1770 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 126 mm x 180 mm x 30 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.