1920.] The Lincoln Tractor Trials, 1920. 119 



trials in this country. Of the eight, three were of British 

 manufacture, one was Canadian and the remaining four were 

 American. 



The British machines were the British Wallis, the Peter- 

 boro and the Pick. The first has already been referred 

 to in Class 1. The Peterborough is designed and constructed 

 on excellent lines. The Pick resembles, in general design, 

 the Austin and Fordson types. The most noticeable feature- 

 is the overlapping strakes which are embodied in the back 

 wheel construction. This arrangement is cast solid with the 

 main body of the wheel. So designed, the wheel, even on 

 sticky soil, remained unchoked. 



The Canadian machine, the Chase, has several interesting 

 features. It is three-wheeled, without the disadvantages 

 usual in that class of machine: it is easily manoeuvred on 

 the headlands by eliminating the differential gear and putting 

 the drive on the two rear wheels under the control of th© 

 operator, who can, therefore, when turning the headlands, 

 declutch the inside wheel and drive only on the outer. 



Among the American machines, the Case is a larger edition 

 of the model entered in Class 1. The Hart Parr is entirely 

 new. The principal point of interest is in the engine, which 

 is a two-cylinder, slow-running horizontal unit, transmitting 

 through a clutch and series of plain spur wheels to the 

 differential on the rear axle. The frame of this machine is 

 also, in the main, a casting made extremely strong with the 

 object of eliminating any risk of distortion. 



The Twin City, another new machine, is an American 

 product with an unusual feature in the engine; it has four 

 valves to each cylinder, two for induction and two for exhaust. 

 In designing the frame the manufacturers have made an 

 interesting departure; the frame serves as a casing for the 

 transmission gear, but does not actually form a part of the 

 engine, which is suspended within it. 



The Parrett tractor attracted considerable attention, mainly 

 on account of its somewhat unusual appearance, caused by the 

 large diameter and the wide spread of its wheels. This' con- 

 struction has a decided advantage at the headlands, since it 

 considerably facilitates the turning operation. 



Performance. — A detailed review of the trials must 

 necessarily await the report of the Judges, but the present 

 opportunity may be taken to give the impressions that were 

 received in watching the machines at work. 



