Everyone who has used rheostats of the sliding-contact type has experienced inconvenience in obtaining the desired values of current and voltage. If the rheostat is connected in series with the load, small currents cannot be obtained. If the load is shunted across a portion of the rheostat on the potentiometer principle, part of the winding carries a double load and consequently only a fraction of the full current capacity is available. To secure the advantages of both methods of connection there must be a complete rewiring of the circuit. This requires time and attention and especially in the case of students affords an opportunity for injury to the rheostat and other apparatus. These difficulties have been eliminated in a new design in which the line and load terminals are completely differentiated and properly labeled and the change from series to shunt connection is made by closing a simple knife switch.
Proceedings of the Iowa Academy of Science
©1917 Iowa Academy of Science, Inc.
Dodge, H. L.
"Certain Features of Rheostat Design,"
Proceedings of the Iowa Academy of Science, 24(1), 183-187.
Available at: https://scholarworks.uni.edu/pias/vol24/iss1/28