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Hand skipping rope equipment is developed with braking trundles which can count. With the help of trundles people can move the machine to a right place. The right and left circle diameter are 2100mm. Distance of the two circles can be changed. Mechanical counter is installed on the handle . Turns can be moved to the left circle and the drive shaft by the counting handle. Meanwhile the counter begins to count. The shaft move turns from the chain to right circle. Four identical chain wheels are designed, the right and left circle can drive rope rotate at the same time. When the speed is 0. 5r/s, centrifugal force of rope is 12. 26N. When the acceleration was set with 3 valve the simulation shows the acting force of revolving axle is 64N, 11. 8N, 23N, which is similar with calculation.

A variety of standard hardware has been developed to link the Sigma 2 control computer to the Indiana University cyclotron. Monitoring of analog signals is accomplished by using dual ramp, integrating analog to digital converters of the 11 bit or 14 bit variety. Up to 16 channels may be multiplexed to each converter. The control of power supplies is accomplished by using 12 bit or 16 bit digital to analog converters, which may be optically isolated if required, or by motor-driven potentiometers. Movement of probes or slit assemblies is accomplished via stepping motors with feedback obtained from a mechanical counter with electrical readouts or from potentiometers. A standard on/off circuit has been developed which is applicable to power supplies as well as to solenoid operated devices such as beam stops and valves.

Much current neuropharmacological research describes drug site of action and effect in terms of rotational behavior in rats. Such studies at the National Institutes of Health led to the development of required instrumentation capabilities. The method developed for quantifying rotational behavior to the exclusion of other locomotor activity is presented. Such full turns counts can be output as mechanical counter inputs, computer inputs, user-selected time interval subtotals, summary totals, or a voltage proportional to cumulative count which provides turning-rate data when recorded on strip-chart. The latter two options are described herein.

A simple large range digital readout micromanometer has been designed and fabricated. The innovative feature is a suitable gear train which transmits the rotational motion of the lead screw to a 5‐digit reversible mechanical counter. The digital readout makes the data collection easier, convenient, and less liable to reading errors.

The counter uses a loud-speaker movement in conjunction with a stop-watch mechanism. It has a greater resolving power than a telephone call counter, and its lower inductance makes it very suitable for operation from a thyratron.