The Making of the Glencairn Methuselah Window: Page 11

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MODELLING CLAY BACKING
Put material in about 10 o’clock - within a few minutes raised the Rheostat to 8 points there it is to remain until 1660°F is reached
Reached 1660°F at 12:15 P.M.

Front crucible removed lid removed
wire removed

Material poured out at 12:15 into an iron pan with a little water in it. Smashed in an iron pot, but this should not be as the iron coming off would make the color a little blackish

The best way is to smash up material in porcelain mortar with porcelain pestle

GRINDING

Modelling Clay Backin	<large left bracket “{“ with 3 lines of test to right of bracket>	481 grammes Modelling Clay flux described above
		43.700 grammes puntied <sp?>
		Burnt Modelling Clay

I added to this for grinding 262 grammes of water for grinding in the pebble mill

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