In a muffle, in heated sand, with hot pieces of flat iron, and in boxes heated to the requisite temperature in an oven, the temperature being indicated by a pyrometer or heat-gauge.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
The degree of temper is regulated by the temperature to which the saws are heated, which is ascertained by a pyrometer.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
He distinguished himself by his own contributions to science, and his name is still identified with the pyrometer which he invented.
"Self Help"
Samuel Smiles