Description:
- Object ID: ALSA 2006.06.01
- Made by: Hearn & Potter, Toronto, C.W.
- Model: Unknown
- Serial Number: Unknown
- Date Made: Dating from around 1850.
- Approximate size: Unknown.
- Accessories: Wooden Box, Brass Cover, Two Brass Sights.
- Condition: fair
Commentary:
The instrument sems to be designed to be set on a pole. Two bubble tubes are set at right angles on the brass plate of the compass. A removable brass plate cover protects the glass cover of the compass.
There is a brass plaque prepared by the ALSA with the compass that states:
VERNIER COMPASS
The Vernier Compass is one which allows a surveyor to adjust for magnetic variation and obtain correct bearings directly from the compass. This is made possible by the inclusion on the compass of a sliding scale which measures the parts of the divisions indicated on another stationary scale.
Dating from around 1850, this vernier compass was manufactured in Toronto by Hearn & Potter.
Source of Object: Unknown.
Notes: The Society has only one in their collection.
References: Visit article Circumferentors – Made in Canada before Confederation for additional information.
Description by: Updated by Ed Titanich, October 2, 2024.