For determining the electrical equivalent of heat. The cover contains a mounted heating coil of about 1.5 ohms resistance with standard binding posts for electrical connections. When connected to a 6-volt battery, this coil will cause a temperature rise of about 5 degrees centigrade in 10 minutes. The supporting posts and coil are coated to prevent electrolysis. Provided with an insulated handle, stirrer, and a single-hole rubber stopper. Device measures 4" x 4" x 7".