
Callendar's apparatus for the mechanical equivalen

Callendar's apparatus for the mechanical equivalent of heat, with two 2kg weights, set of slotted weights, silk belt and bent thermometer, by The Cambridge Instrument Co. Ltd.
Callendar's apparatus for the mechanical equivalent of heat, with two 2kg weights, set of slotted weights, silk belt and bent thermometer, by The Cambridge Instrument Co. Ltd.