Abstract: A timer system (10,110,210) of two or more timers (10,110,210) measures the response time between an initiating event and a dependent event. The initiating and dependent events may be physically separated or electrically isolated. The timer system (10,110,210) permits recording of associated initiating and dependent events for a response time test followed by the recording of additional associated initiating and dependent events for additional response time tests while the timers remain separated. Thus, the timer system (10,110,210) permits serial recording of information for a large number of response time tests. The timers (10,110,210) may be identical. The timers (10,110,210) are interconnected and synchronized, then disconnected and separated to record the time of occurrence of the physically separated or electrically isolated events. The timers (10,110,210) are then again interconnected for a simultaneous recording of the elapsed time on each timer.

Abstract: A method for synchronizing a master clock and a remote slave clock which nominally has the same pulse frequency but may be out of time-phase comprising transmitting a master pulse to the slave, measuring the time delay, .DELTA..tau., between the received pulse and the nearest succeeding (in time) slave pulse, delaying the latter slave pulse by .DELTA..tau. to provide a conjugate slave pulse, transmitting the conjugate pulse to the master station and measuring the time difference .DELTA. between time of reception of the conjugate pulse and time of generation of the original master pulse. The time .DELTA. is equal to twice the error between the master and slave pulses. The process can also be done at the slave station if the slave pulse is transmitted to the master and a conjugate-phase master pulse is retransmitted to the slave where the measurement is accomplished. The phase of the slave pulse can then be adjusted by .DELTA./2 to synchronize it with the master pulse.

Abstract: A programmed digital secondary clock which functions as a master clock, a sub-master clock or a slave clock. The master clock maintains an updated real time count based on a 50 hz or 60 hz ac line or digital oscillator signal, displays the count, and serially transmits digital information representative of the updated real time count for use by a slave clock. The sub-master clock, receives an hourly or twice-a-day correction signal from a conventional master clock or a conventional electronic receiver, corrects the real time count, displays the corrected count, and serially transmits digital information representative of the corrected real time count for use by a slave clock. Identical programmed digital secondary clocks can be connected in daisy chain. The first clock can operate as a master clock or as a sub-master clock. The following clocks can be operated as slave clocks.

Abstract: A device for adjustment of an electrical clock with a clockwork train, the latter having an hour pointer driven via an hour gearwheel and via an hour intermediate wheel, a minutes pointer which is driven by means of a minutes gearwheel (the hour intermediate wheel being coupled in clock drive operation with the minutes gearwheel) and a minutes intermediate wheel, as well as having additional gearwheels with a first transmission ratio, the minutes intermediate wheel being coupled with a motor via the additional gearwheels. The minutes gearwheel is decouplable from the minutes intermediate wheel for the coarse adjustment of the minutes pointer and, by means of at least one additional gearwheel with a second transmission ratio which is more direct than the first transmission ratio, the minutes gearwheel is coupleable with the motor.

Abstract: A portable, self-contained, cummulative elapsed time recorder unit for personal use which records and stores data representing time spent by an individual working on each of a number of different work assignments, to provide a time record for billing purposes. The recorder unit includes a counter which is incremented when the unit operates in a timing mode to record a time element representing time spent working on an assignment, and a memory having a plurality of data storage locations, each assigned to a different work assignment for storing the time elements, the data storage locations being individually addressable by manually operable select switches. The recorder unit includes a display unit which provides a numerical display of the data stored at a selected memory location while the unit is operating in the display mode.