Movement of the switch control lever applies tension to a spring until a tipping point is reached, and the contacts suddenly snap open or closed as the spring tension is released.
42.
The primary disadvantage of any double-action trigger is the extra length the trigger must be pulled and the extra weight required to overcome the spring tension of the hammer or striker.
43.
The potential energy at maximum axle yaw may be increased by including an elastic constraint on the yaw motion of the axle, so that there is a contribution arising from spring tension.
44.
However, these older focal-plane shutters wiped the exposure fairly slowly, even under the highest available spring tension, because the delicate curtain was too fragile to survive the necessary accelerative shocks to move faster.
45.
These were held under spring tension for automatic balance in gusts, but were also connected through cables to the pilot s seat so they could be operated mechanically by the pilot for roll control.
46.
It is lowered manually into the light pass behind the camera lens and held in position against spring tension by pushing a small knob on the side of the periscope to its down position.
47.
Similarly, when the weight is rotating back and forth, each twist of the weight in the direction that unwinds the spring also reduces the spring tension slightly, causing the weight to sag a little lower.
48.
Their most common 4? inch shutters had four slit widths ranging from 1?to [ ! inch and up to six spring tensions for a speed range of 1 / 10 to 1 / 1000 second.
49.
Cams that have excessive valve lift, running at high rpm, can cause what is called " valve float ", where the valve spring tension is insufficient to keep the valve following the cam at its apex.
50.
Langley realised that sustained powered flight was possible when he found that a 1 lb . brass plate suspended from the rotating arm by a spring, could be kept aloft by a spring tension of less than 1 oz.
