Such jackets were (are?) a common product provided for newly hired miners on the South African gold mines on which I worked, until they became aclimatised. 45 deg C and plus 100% humidity was not uncommon at some places I knew.

I remember the mine manager at my first monthly technical meeting demanding to know from the ventilation officer what the temperature was in a certain working place. After much obfustication, the ventilation officer had to admit that he did not know as his man had passed-out before obtaining a reading. [Linked Image]

After two years working down there, I felt that I wasn't operating at maximum efficiency until it was steamy hot and I was sweating like the proverbial! [Linked Image]

[This message has been edited by Hutch (edited 01-09-2003).]