Description:
- Object ID: Unit 1: ALSA 2015.04.04. Unit 2: ALSA 2015.04.04.
- Made by: Tellurometer (PTY) Limited – Plessy Group
- Model: MRA 3
- Serial Number: Unit 1: s/n1637, Unit 2: s/n1636.
- Date Made: Introduced 1963.
- Approximate size: 30.1 cm (l) [including dome] X 30.1 cm (w) X 30.5 (h) [including leather handle]
- Accessories: Unit 1: Canvas backpack. A small black plastic psychrometer. Operating Instructions in a green binder. Unit 2: Canvas backpack. A headset that has a microphone and speaker attached. A cable for hooking an external battery to the instrument and a small box of fuses. A small black plastic psychrometer. Operating Instructions in a green binder.
- Condition: Good
Commentary:
These two MRA3’s work together to measure distances. As for the MRA2 the MRA3’s incorporated both the Master function and the Remote function in one instrument. It had an improved accuracy of +/- 15mm + 3ppm.
A metal tag on both units reads: “MICRO-DISTANCER TELLUROMETER MADE IN SOUTH AFRICA BY TELLUROMETER (PTY.) LTD.CAPE TOWN”.
Source of Objects: Both Units were donated by Hamilton & Olsen Surveys Ltd.
Notes: These are the only MRA3’s in the collection.
References: Visit article “The Skill of Chaining would be lost” – The Tellurometer for additional information.
Description by: Ed Titanich, October 29, 2024. and gord Olsson, December 17, 2025