Description:
- Object ID: ALSA 2013.01.02
- Made by: Unknown.
- Model: Unknown.
- Serial Number: Unknown.
- Date Made: Unknown.
- Approximate size: 12 cm long X 1.5 X 1.7 cm.
- Accessories: Unknown.
- Condition: good
Commentary:
It is also called a plane table compass or declinator. It is used to mark magnetic north on the plotting paper on the plane table drawing board. 12 cm long X 1.5 X 1.7 cm. Lever to lock compass needle on side.
Source of Object: Donated by Lou Breton, ALS.
Notes: The Society has two other Trough Compasses, ALSA 2007.28.02 (Weir) and ALSA 2012.01.01 (Frederick).
References: Visit article The Survey Instrument Captain Cook Wanted to Learn – The Plane Table and Alidade for additional information.
Description by: Entered by Ed Titanich on December 23, 2024.