linotype pot temp

Trying to remember temperature of Linotype pot.When we found thermometer was faulty,we put a folded piece of newsprint into type metal; a definite yellow colour was about right,brown was too hot.The thermostat of a machine stuck just before lunch-break,a piece of paper in the metal after lunch burst into flames.
We had prob with gas-fired pots about 4 p.m., when housewives started cooking and reticulated(coal-gas) mains pressure fell off.

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535 to 550 degrees, haven’t seen the paper trick in a while, when smelting the lead in the furnace that is how we always checked the lead temp.