]0 Dec, 1918.] Motor Tractor Trials. 729 



(c) Mr. William Ross's Refort on Ploicghing. 



The character of ploughing was judged by Mr. Wm. Ross, and his report 

 is here incorporated, so that it can be read in conjunction with the foregoing 

 tabulated results : — 



Steel Mule Tractor, pulling one six-furrow Mitchell low mouldboard 

 plough, did very good work, especially on one side of, and, where there were 

 no stones. This lot was nearly all stiff clay, and was well down to the 

 required depth of 4^ inches. The plough was handled by one man. 



McDonald's E.A.A. Tractor, pulling one five and one four furrow Mitchell 

 mouldboard plough. This cut was also mostly in stiff clay and some very 

 large stones. It was a very good job in that kind of land, and well down 

 to the required depth. The plough was handled by two men. 



Waterloo Boy Tractor, pulling one five-furrow mouldboard plough 

 (Mitchell and Co.). This tractor and plough were handled by one operator ; 

 seemed to get along slowly at the start, but improved as time went on. Did 

 good work in that kind of land — stiff clay at one end in particular — and 

 was well down to the depth. 



McKay Tractor, Sunshine " A," pulling a four-furrow mouldboard 

 McKay plough. By the time this lot was reached there was less clay. This 

 cut was neatly ploughed, and a very good job generally, and well down to 

 the depth. One man on the plough. 



International Tractor, pulling one three-furrowed mouldboard imported 

 plough. The clay had disappeared from the surface of the land. This 

 tractor and plough were handled by one man, and seemed to be very easy 

 to manage. The plough made a very useful job, and was well down to the 

 depth. 



Imperial Tractor (light), pulling two four-furrow McKay disc ploughs. 

 These two disc ploughs made a really good job (as disc work is done). The 

 plough was managed by two men, and was well down to the depth. 



Jelbart Bros.' Tractor, pulling one three-furrow disc, one four-furrow 

 disc, and one six-furrow disc, or thirteen discs in all. of T. Robinson and 

 Co. They made a very good job until half finished ; after that they worked 

 too shallow. Worked by two ploughmen. 



McKay Tractor, Sunshine " 0," pulling two three-furrow discs. These 

 ploughs practically worked too shallow all the time. Worked by two 

 ploughmen. 



2. EngineJPerformances. 



Tests were conducted at the Engineering School, University of Melbourne, 

 from 1st to 7th October, 1918, for the purpose of determining efficiency of 

 the engines under'normal and maximum load conditions. 



The engines were belted to a dynamo, the output was measured with 

 standardized instruments, and the generator loss was separately determined, 

 and has been allowed for, as shown in Tables III. and IV. 



