Kistler Group, sensors and sensor electronics for measuring pressure, force, torque and acceleration.
Forty five years later, this essentially remains the method of measuring torque although the electronics are now based on single-board computer technology with such features as colour display and touch sensitive screen.
In order to measure power one needs to measure torque or force and speed.
The dynamometer measures the thrust and torque of the propeller.
The term "brake horsepower" is one measurement of power derived from this method of measuring torque.
Most cycling power meters use strain gauges to measure torque applied, and, combined with angular velocity, calculate power.
A dynamometer consists of an absorption (or absorber/driver) unit, and usually includes a means for measuring torque and rotational speed.
A dyno that can measure torque and power delivered by the power train of a vehicle directly from the drive wheel or wheels (without removing the engine from the frame of the vehicle), is known as a chassis dyno.
The actual useful power of any traction engine can be calculated using a dynamometer to measure torque and rotational speed, with peak power sustained when transmission and/or operator keeps the product of torque and rotational speed maximised.
However, some engineers present at the test, loyal to Edison, claimed that the turbine was a failure based on a misunderstanding of how to measure torque in the new machine.