Tasimer

[Sarah]

An instrument for detecting or measuring minute extension ormovements of solid bodies. It consists essentially of a small rod,disk, or button of carbon, forming part of an electrical circuit, theresistance of which, being varied by the changes of pressure producedby the movements of the object to be measured, causes variations inthe strength of the current, which variations are indicated by asensitive galvanometer. It is also used for measuring minute changesof temperature. T. A. Edison.