Platinum resistance thermometry at high temperatures . Two of these thermometerswere made of pure palladium wire mm diameter, while theother 9 were of platinum. Three types of thermometer were used, which may be brieflydesignated as a. Compensated lead type. b. Potential terminal type. c. Combined compensated lead and potential terminal three types are illustrated diagrammatically in Plates I and II. In the compensated lead type, due to Callendar,18 two fairlylarge platinum leads (preferably over mm diameter), asnearly identical as possible with the leads to the coil, run do
Platinum resistance thermometry at high temperatures . Two of these thermometerswere made of pure palladium wire mm diameter, while theother 9 were of platinum. Three types of thermometer were used, which may be brieflydesignated as a. Compensated lead type. b. Potential terminal type. c. Combined compensated lead and potential terminal three types are illustrated diagrammatically in Plates I and II. In the compensated lead type, due to Callendar,18 two fairlylarge platinum leads (preferably over mm diameter), asnearly identical as possible with the leads to the coil, run down thestem of the thermometer, and are connected at their lower these leads are put into the arm of the Wheatstone bridgeadjacent to the arm in which the thermometer coil is inserted thethermometer is compensated for variations in temperature of theleads to the coil, due to variable depth of immersion. To com-pensate for the effects of heat conduction from the coil along theheavier platinum leads, the ends of the compensating leads are LLl. ^=
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