Dewar Trophy

The Dewar Trophy was a cup donated in the early years of the twentieth century by Sir Thomas R. Dewar, M.P. a member of parliament of the United Kingdom (UK), to be awarded each year by the Royal Automobile Club (R. A .C.) of the United Kingdom "to the motor car which should successfully complete the most meritorious performance or test furthering the interests and advancement of the [automobile] industry".

Some of the trophy winners include:

On Saturday, 29 February 1908, three Model Ks from the 1907 Cadillac production were released from the stock of the Anglo-American Motor-car Company, the UK agent for Cadillac automobiles, at the Heddon Street showroom in London (these were engines Nos. 23391, 24111 and 24118). The three cars, all registered in London under the numbers A2EO, A3EO and A4EO, were driven 25 miles to the Brooklands race track at Weybridge. There, the cars completed ten laps of the track, or approximately 30 miles, before being locked away until Monday, 2 March 1908, when they were released and disassembled completely, using only wrenches, screwdrivers, hammers, and pliers. Each car was reduced to a pile of 721 component parts, which were then scrambled into one heap by the RAC. Eighty-nine parts requiring extreme accuracy were withdrawn from the heap, locked away at the Brooklands club house and replaced with new parts from Anglo-American's showroom stock. The parts were then sorted into three piles, each with all the parts needed to assemble a car. A mechanic - Mr. E. O. Young - reassembled the cars with the help of his assistant - Mr. M. M. Gardner. Sometimes they had to work ankle-deep in water, using only wrenches and screwdrivers. The third car was re-assembled by Thursday morning, 12 March. With the painted parts on the original cars not being identical in color or style, the reassembled cars were mismatched in appearance, gaining the nickname "harlequin cars". By 2 p.m. on Friday 13 March the three cars had completed the mandatory 500-mile run with singular regularity. Only one point was lost owing to a broken cotter pin in the ignition lever (promptly replaced from stock). During the event, it was reported that one of the sheds where the parts were stored became partly flooded during a heavy storm and some parts became rusted. Only oily rags could be used to remove all traces of the immersion. On completion of the test, one of the cars was locked away until the start of the 2000-miles reliability trials in June 1908. It came out the winner of the R.A.C. Trophy for its class. Parts interchangeability had been publicly demonstrated and field tested.

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