Method of determining temperature of A-C. generators and motors, and room temperature

In this paper, attention is called to various methods of determining temperature of apparatus, recommendations being made for the use of a definite covering for thermometer bulbs, based on the results of experiment. Measurement of temperature by resistance is confined to the rotor windings of machines on which thermometers cannot be applied; the inaccuracy of this determination for stators is pointed out. Temperature measurement by special coils inserted in the windings is recommended for machines of fairly high capacity, wound for 6600 volts and above. For room temperature determination in general, a metal cylinder covering for thermometer bulbs is recommended. Room temperature determination is shown to be of primary importance and a fair room temperature must be arrived at, in different ways, depending on the method of ventilation used.