Metal rectangular kilowatt meter. No glass cover. Contains a paper rolling graph measuring kilowatt usage in red ink. A demand meter is capable of measuring two distinctly different values: energy and demand. This type of demand meter or Kilo watt hour (kWh) meter records power usage averaged over a half hour period (1 increment). It then resets itself to zero and begins to record again. A paper tape graph is fed (records) each increment of 0-100 kilo watts over a period of a month. The consumer is then billed for the power used. This meter was one of two installed at the Whakatane Board Mills in 1939. (Make unknown possibly Westinghouse)
Kilowatt Meter, 1980.44.1. The Museum of Transport and Technology (MOTAT).