Clayton tractor and bomber

  As a controlled establishment under the Munitions of War Act Dorman's other activities were manifold. Dorman engined tractors helped construct military camps amidst roadless moorlands, towed giant bombers across French airfields and hauled ploughs to exploit the nations agricultural resources for the Food Production Department of the government. Dorman engined rollers made roads for the armies and Dorman engined generating sets, static or mounted on the back of lorries, supplied lighting and other services for barracks, hospitals and ships and Dorman engined vessels cruised the seas.
 Perhaps the Company's most vital contribution to the war effort emerged at about its beginning when Mr.

Walter Haddon, the Chairman became financial backer and half-owner of the invention of a youthful looking rock drilling engineer living in England as a Rumanian expatriate, Mr. George Constantinesco.
   Mr. Constantinesco whose grasp of mathematics was as assured as his command of English was fractured, had quite simply pioneered a new means of transmitting power; through columns of liquid, not by hydraulic means but by what Constantinesco called sonic wave transmission, which as its name suggests was comparable to the passage of sound waves through the air, ripples through a pond, or shock waves through the earth.
    With the onset of aerial warfare, Constantinesco's

brainchild was applied to overcome the problem which beset contemporary fighter aircraft; the ideal location of the aircraft's guns was on the nose directly ahead of and in line with the cockpit, so that to aim the pilot had simply to fly toward his adversary — the snag being that this placed his own propeller between gun and target. Various types of deflector and interruptor gear were used by both sides, until finally Constantinesco assisted by Major G. C. Colley, devised a method using his wave transmission to interrupt the fire of the guns for the split second that the propeller blades blocked the line of fire. This worked with such greater precision than any of the purely mechanical means which had formerly been designed to the same

end, that Allied aircraftcould from then on, at 2000 rounds per minute, quite simply pour out more firepower than the Germans, as our interruptor gears were required to come into play for far briefer periods. It is quite possible, that this, for the Allies, won the war in the air; the earliest aircraft to be equipped with Colley-Constantinesco gear were the D.H.4's of No. 55 Squadron R.F.C. who went to France in 1917.
   Haddon and Constantinesco were each to receive a substantial financial reward from the grateful Government for their joint contribution to the war effort; Dorman's role had been to manufacture, in the course of the war, a number of Constantinesco's interruptor gears, well in excess of 30,000.

Mr. Constantinesco

Interruptor Gear

Mr. G. Constantinesco, inventor of the machine gun synchronising gear for aircraft.

Dorman-engined Clayton tractor towing a bomber, during the 1914-1918 War.



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Dorman Centenary CB 6-7 CB 10-11

General layout of the Constantinesco synchronising gear.

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