1921.] Lincoln Tractor Trials, 1020. 350 



These give the minim uin, the average of the five lowest, and 

 the maximum in each chiss for hea.vy and light land, and under 

 the head " Total cost of labour and fuel per acre " give the 

 minimum and the average for the whole class. A note warns 

 us that " the figures for minimum time and minimum fuel 

 consumption per acre do not necessarily apply to the same 

 tractor " and that " the same is the case for the maxima," 

 and we are left in complete doubt as to the bearing of these 

 figures on the awards. 



If the object were to institute a comparison between classes 

 of machines these figures would doubtless be of value, although 

 we may express a doubt whether the classification adopted for 

 the purposes of this competition has the highest scientific value. 



Tt appears that in Class I (two-furrow tractor) the minimum 

 time to plough an acre on Hght land was 1.58 hours, the 

 maximum 2.33 hours; on heavy land 1.75 hours and 2.61 hours, 

 respectively. In Class TI (three-furrow tractor) the times 

 were, for Hght land, minimum. 1.09 hours, and maximum 1.99 

 hours; for heavy land, 1.30 hours and 4.00 hours respectively. 

 In Class VTI (motor ploughs) on light land, minimum 1.46 

 hours and maximum 2.42 hours; on heavy land 1.30 hours 

 and 3.22 hours respectively. 



The consumption of fuel in gallons per acre was as follows: — 



]\Iin. "Max. 



Class I.— Two-furrow tractors, light land ... 2"G3 5'41 



heavy „ ... 3*42 5*51 



Class II. — Tliree-furnnv tractors, light land ... 2 06 4'12 



heavy „ ... 2-96 6-51 



Class VIL— Motor ploughs, hght land ... 2-21 4-4H 



lieavy ,, ... 2*27 G-21 



On the basis of 18d. per hour for each attendant, the wages 

 worked out in pence per acre are as shown below. In the last 

 two columns are given the total cost of labour and fuel per 

 acre. The prices taken for the purpose of the table were: — 

 Paraffin, Is. lid. per British gal.; petrol, 3s. 5d. net. per gal. 



Class I. — Two-furrow, light ... 



heavy 



Class II.— Three-fmrow. h'lrht ... 



li.avy 



Chiss VII.— Motor ploughs, light 

 heavy 



The figures for the total costs given in the table were taken 

 on the actual acres plouglied, and represent the total per acre 





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