718 



The Lincoln Tractor Trials, 1920. [Nov., 



earlier years; a complete change of design has been adopted 

 in several instances where the old name has been retained. 



In Class 1 the new machines were the British Wallis, the 

 new Saunderson, the Case and the Samson — ^two British and 

 two American. 



The British Wallis is a modified and considerably improved 

 pattern of the old three-wheeled American Wallis. The most 

 obvious alteration has been the addition of another wheel, 

 making it a four-wheeler, but there are many other detailed 

 modifications, which add to its usefulness. The other British 

 machine, the Saunderson, is, as regards the general principles 

 of its design, a replica on a smaller scale of the standard model 



G " tractor of the Saunderson Company. It has the same 

 two-cylinder vertical engine and arrangement of clutch, gear- 

 box and final drive. 



The Case comes from a well-known American firm, and the 

 machine is very original in detail design from front to rear. 

 One-piece cast frames have been used previously, but never on 

 the style of this machine, in which an extremely strong cast- 

 iron member runs from front to rear, carrying on its front end 

 the radiator; the engine is disposed midway across the frame 

 which, at the rear, serves also to support a gear box and axle 

 case. The Sylphon Thermostat is a useful feature of the Case. 

 It is a device, controlled directly by the heat of the engine and 

 cooling water, which operates to bring the engine itself, when 

 starting from cold, rapidly to the temperature at which it will 

 best vaporise fuel, and maintains it at that temperature 

 throughout the whole period of its working. This effect is 

 attained by means of a valve, which is opened or closed as 

 the temperature of the cooling water rises and falls, and which, 

 when closed, throttles the circulating water pipe between 

 engine and radiator, and thus controls the amount of cooling 

 water w^hich passes to the engine. 



The other new American machine in Class 1, the Samson,, 

 resembles externally the Fordson. An interesting feature in 

 this machine is the lubricating arrangement. There are only 

 a couple of holes through which oil need be poured occasionally ; 

 no other attention of that kind is necessary. The Samson is 

 of the type of machine in which the engine and transmission 

 case are bolted together to form one complete unit which a<?ts 

 as the frame of the chassis. 



In Class 2 there were twenty-one machines, and of these 

 no fewer than eight were making their first appearance in 



