Then to the paying-out drum P, from it to the dynamometer D, and finally to the stern pulley, over which it passes into the sea.
Using these buoys to guide the direction of tow, a grapnel, a species of fivepronged anchor, attached to a strong compound rope formed of strands of steel and manila, is lowered to the bottom and dragged at a slow speed, as it were ploughing a furrow in the sea bottom, in a line at right angles to the cable route, until the behaviour of the dynamometer shows that the cable is hooked.
This corrected pull is then divided by the weight of the vehicles hauled, in which must be included the weight of the dynamometer car, and the quotient gives the resistance per ton of load hauled at a certain uniform speed on a straight and level road.
The best way of deducing r„ is to select portions of the dynamometer record where the speed is constant.
[[[Magnetic Measurements]] introduced the method of measuring hysteresis by means of an electro-dynamometer used ballistically.
The fixed and suspended coils of the dynamometer are respectively connected in series with the magnetizing solenoid and with a secondary wound upon the specimen.
Baron Prony's dynamometer (Ann.
Morin's dynamometer is shown in fig.
In a dynamometer used by F.
The spring of the dynamometer car used by W.
In the Ayrton and Perry transmission dynamometer or spring coupling of this type, FIG.
In a belt dynamometer built for the Franklin Institute from the designs of Tatham, the weighing levers are separate and arranged horizontally at the top of the apparatus.
See also DYNAMOMETER for illustrations of the use of what are essentially friction-straps of different forms for the measurement of the brake horse-power of an engine or motor.
The useful residue, known as the "actual," "effective" or "brake" horse-power, can be directly measured by a dynamometer; it amounts to about 80% of the indicated horse-power for good condensing engines and about 85% for non-condensing engines, or perhaps a little more when the engines are of the largest sizes.
In., and the dynamometer showed a thrust of more than 2100 lb.