Description:
- Object ID: ALSA 2006.05.03.01 and ALSA 2006.05.01
- Made by: Plessy Group
- Model: MRA 5
- Serial Number: 1203, 1204
- Date Made: Introduced in 1973.
- Approximate size: unknown
- Accessories: Unit 1203: Backpack, headset, battery cables, operators’ manual, checklist, antenna dish, long cable for attaching the antenna to the control unit, adopter for attaching antenna, rain cape.
- Unit 1203: Backpack, headset, battery cables, checklist, antenna dish, fuse box with 3 fuses, rain cape, canvas strap.
- Condition: Fair
Commentary:
The Tellurometer MRA5 was built to demanding British Army specifications. A feature of the MRA 5 was that the antenna could be connected either to the front of the control unit, the top of the control unit, a tripod, or using a long cable to an adaptor at the top of a mast up to 25m from the control unit.
The diagram in the top image shows the antenna mounted on the top of a tripod. The bottom mage shows the adopter for attaching the antenna, a long cable for connecting the antenna to the control unit, cables for attaching a 12 volt car battery to the control unit, and headphones.
This pair of tellurometers was used by the Alberta Director of Surveys for control surveys in Alberta.
Source of Object: Donated by the Director of Surveys
Notes: This is the only pair of MRA 5s in the Societies collection..
References: Visit article “The Skill of Chaining would be lost” – The Tellurometer and Sturman and Wright, The History of Tellurometer. for additional information.
Description by: Ed Titanich, October 29, 2024 and gordon Olsson on December 2, 2025..