English: A conceptual model of J. H. Sharp's patented torque measuring wrench.
Patented in 1931, this was the first of its kind. This type of wrench is known as an indicating torque wrench. In order to be used correctly the dial must be visible and directly in the line of sight of the operator.
The wrench end of the tool is held in equilibrium by two calibrated springs. Application of torque overcomes the resistance of the springs causing the wrench end to rotate about its pivot. This rotation is transferred to the dial pointer which in turn indicates the measured torque on the dial face.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.