886 



EXPEKIMENT STATION RECORD. 



Tests made on an eight-macliine milking equipment driven by a 3-horsepower 

 motor indicate that the power cost is about 2 mills per cow with electricity at 

 10 cts. per kilowatt-hour. The average load on the motor was 2.3 horsei)ower 

 and the vacuum maintained by the pump was 15 in. A test of a feed grinder 

 running at 650 revolutions per minute and driven by a 5-horsepower motor 

 showed the power consumi)tion when grinding corn to be 0.433 kilowat-hour 

 per bushel. Tests on another grinder driven by a 15-horsepower motor showed 

 a current consumption of 0.411 kilowatt-hour per bushel. 



Results secured with a small thresher having a 2S-in. cylinder and a 42-in. 

 sepai'ator and driven by a 15-hor.sepower electric motor showed that the ix)wer 

 consumption incident to threshing a ton of oat straw averaged about 2.G2, of 

 barley 2.36, and of wheat 2.27 kilowatt-hours. The power consumption per 

 bushel of oats averaged 0.07, of barley 0.108, and of wheat 0.16 kilowatt-hour. 



The sizes of motors suggested to be used for different farm operations are 

 given in the following table : 



Sizes of )notors to use on different machines. 



Machine. 



Household machines: 



Sewing machine 



Buffer and grinder. . . 



Vacuum cleaner 



Ice-cream freezer 



Washing machine 



Meat grinder 



Water pump 



Dairy machines: 



Water pump 



Cream separator 



Churn 



Milking machine, 

 vacuum system.. . . 



Refrigeration 



Farm machines: 



Feed grinders (small) . 



Feed grinders (large). 



Silage cutters 



Shredders and busk- 

 ers 



Threshers, 19-in. 

 cylinder.... 



Horsepower of motor. 



Mini- 

 mum. 



Maxi- 

 mum. 



Size 

 most 

 com- 

 monly 

 used. 



Both. 



hi 



i 



hi 



15 

 15-20 



Horsepower of motor. 



Machine. 



Mini- 

 mum. 



Farm machines— Contd. 

 Threshers, 32-in. 



cylinder 



Corn shellers, single 



hole 



Power shellers 



Fanning mills 



Grain graders 



Grain elevators 



Concrete mixers 



Groomer, vacuum 



system 



Groomer, revolving 



system 



Hay hoists 



Root cutters 



Cordwood saws 



Wood splitters 



Hay balers 



Oat crushers 



30 



2 



Maxi- 

 mum. 



Size 

 most 

 com- 

 monly 

 used. 



rarm experience with the tractor, A. P. Yerkes and H. H. Mowry ( U. S. 

 Dept. Agr. Bui. 174 (1915), pp. U). — This bulletin reports data based on the 

 experience of a large number of both successful and unsuccessful u.sers of 

 tractors west of the Mississii)pi River, as well as replies to a circular sent out 

 to bankers in that section. 



Attention is called to the fact that the data represent a record of a machine 

 in the process of development and not of a completed and perfected outfit. 

 " Most of these tractors have been operated by men who were not properly 

 trained and equipped to handle them efficiently, and during the first few years 

 of the development of the gas tractor the machines placed on the market were 

 mainly large outfits, which were necessarily expensive, and failure meant a 

 heavy financial loss. 



" It is generally recognized that the gas tractor was of great value in rapidly 

 breaking up large areas of prairie sod in the West at a time when horses were 



