Tellurometer MRA1

The Tellurometer was invented by Dr. T.L. Wadley, of the South African National Institute for Telecommunications Research, and the first instrument, the MRA1 was introduced in Canada in 1957.

The first one arrived with the simple terse instruction, "if anything goes wrong, kick the power pack." The first power packs had a vibrator, which occasionally stuck, so kicking the power pack was effective and was the recommended practice."

Donated by Director of Surveys Office, 1999.