. Scientific American Volume 92 Number 04 (January 1905) . ledupon to time automobileraces should record varia-tions of an entire secondor more. The need of anautomatic errorless timingsystem is thus plainly madeapparent. Such a sys- Cars Amle ISiUii. KMilc Milt station. Atthe start allthe watchesare set run-n i n g, andthereafter, un-der the controlof a distribu-t o r, thewatches ares uccessivelystopped as thedifferent tim-ing points ofthe course arereached by themachines. The distributor consists of a metal arm adapt-ed to be moved over a distributor plate provided withradially-disposed rows
. Scientific American Volume 92 Number 04 (January 1905) . ledupon to time automobileraces should record varia-tions of an entire secondor more. The need of anautomatic errorless timingsystem is thus plainly madeapparent. Such a sys- Cars Amle ISiUii. KMilc Milt station. Atthe start allthe watchesare set run-n i n g, andthereafter, un-der the controlof a distribu-t o r, thewatches ares uccessivelystopped as thedifferent tim-ing points ofthe course arereached by themachines. The distributor consists of a metal arm adapt-ed to be moved over a distributor plate provided withradially-disposed rows of perforations. Contact pins arefitted into these perforations in any desired combina-tion, and the rows of pins are successively engagedby contact fingers projecting from the distributor contact pin of a row has electrical connectionwith a solenoid, which operates one of the stop watches,so that as the distributor arm is moved around by theclosing of the line circuit at the timing stations, the Watth SnienouU DIAGRAM OF THE ELECTRIC IMPROVED APPARATUS FOR TIMING AUTOMOBILERACES. different watches will be started and stopped accordingto the positions of the pins in the distributor this brief outline of the system in mind, wemay proceed to a more detailed description of theoperations. The wire at each timing station is stretch-ed at the proper tension across the course,and held down by chains to within a fewinches of the ground. One end of the wireis fixed, while the other end is attached toa latch which holds open a switch. Whena car in passing over the wire trips the latch,the switch is closed by action of the spring,and at the same time a time-switch is set inoperation, which opens the circuit again amoment later. The switch may then bereset if it is desired to time a second carat that station. When the circuit is closed,the course of the current may be tracedalong wire, A, through switch, B, strap,G, key, D, switch, E, to the battery, F, then
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