The force \ mathbf { f } ^ { 0 } in a momentary inertial frame measured by a comoving spring balance can be called proper force.
22.
Vanderweyde stated the spring balance used in Crookes'experiment was unreliable as it was easy to manipulate by deception and suggested he should repeat the experiment by using a chemical balance.
23.
We suggested several cures, but Rich from Newton e-mailed us this info : " Could the hum be caused by a harmonic vibration in the spring balances of the windows?
24.
One of his experiments utilized a board and spring balance, the other involved the movement of a table at which a medium sat caused a pointer to indicate letters on a wheel.
25.
The observers kept watch day and night just as on board a ship, and periodically tested the revolution counters and spring balances to ensure that the engines were always running under full load.
26.
The sash weight is connected to the window by a braided cotton sash cord, or a chain, that runs over a pulley at the top of the frame, although spring balances are sometimes used.
27.
If two or more spring balances are hung one below the other in series, each of the scales will read approximately the same, the full weight of the body hung on the lower scale.
28.
In order to infer that the labeled mass values are correct, an object must be hung from the spring balance at rest in an inertial reference frame, interacting with no other objects but the scale itself.
29.
In its simplest form an engine is connected to a rotating drum by means of an output shaft . A friction band is wrapped around half the drum's circumference and each end attached to a separate spring balance.
30.
If they got weak or out of tension, try this : Look at the bottom edge of the bottom sash; there should be a hole at each end of the bottom edge, where the spring balances are located.
