390 EXPEEIMENT STATION KECOED. 



' Owing to the intermittent character of the loading only gasoline as fuel gave 

 satisfactory results. The total average cost for pulling and removing 1.246 

 trees from 3 to 8 in. in diameter was 6.49 cts. per tree. 



The Port Elizabeth farm, tractor and plow trials (Impl. and Mach. Rev., 39 

 (1913), No. Jf57, pp. 76-78, figs. 2). — The results of recent tractor and plow 

 trials to determine the best farm tractor hauling itself and plow attached 

 thereto and the best disk and moldboard plow suitable for direct haulage are 

 reported. 



Ten steam and internal combustion tractors were entered in the preliminary 

 elimination trials, in which a 50 h. p. 8-J ton steam tractor of English manufac- 

 ture hauling 2 4-furrow moldboard plows gave the best results by plowing 2 

 acres of tough land 8 in. deep in 1^ hours, using 152 lbs. of coal and 100 gal. 

 of water. This steam tractor competed with a 56 to 60 h. p. oil tractor and a 

 60 h. p. oil tractor, both of American manufacture, in the final trials and again 

 achieved the victory by plowing, with a 6-furrow moldboard plow, 2 acres of 

 bad ground in 1^ hours, using 151 lbs. of coal and 99 gal. of water. 



The fuel costs for plowing 2 acres were as follows: By the steam tractor 3Si 

 cts., by the 56 to 60 h. p. oil tractor $2.37^, and by the 60 h. p. oil tractor 

 $1.70s. The 6-furrow moldboard plow used in the trials and the 6-furrow disk 

 plow were awarded the plow honors. 



The 6-furrow disk plow can be converted into a 5- or 4-furrow plow. Each 

 furrow turned is 9 in. wide up to 10 in. deep and by using larger diameter disks, 

 which are provided with the plow, it is claimed a depth of 12 in. can be obtained. 



Test of a centrifugal hand separator, I. Rezek and W. Winkler (Osterr. 

 Molk. Ztg., 20 {1913), No. 8, pp. 115-118, figs. 4).— A description ol the mechan- 

 ical details of this cream separator is followed by the results of 17 service te.sts. 

 The machine was driven by an electric motor equipped with a dynamometer to 

 indicate the power consumed in operation. 



The results indicate that under normal conditions of operation an average of 

 only 0.12 per cent of fat remained in the skim milk. By decreasing the speed 

 20 per cent the quantity of fat remaining was raised to an average of 0.22 per 

 cent. The average power required for operation was 6.77 kilogram meters per 

 second, which amounted to 3.02 kilogram meters per second per hundred liters of 

 milk separated per hour. 



It is claimed that this separator is simply constructed, and easily and quickly 

 taken apart, cleaned, and the parts reassembled. On the basis of the test results 

 obtained it is classed as an efficient, durable, and economical machine. 



[Rope], some knots and splices, J. M. Drew (Irrig. Age, 28 {1913), No. 7, 

 pp. 212-220, figs. 82). — This article illustrates and describes several methods of 

 making some of the knots and splices considered to be most useful to farmers 

 and ranchmen. 



A general purpose barn, L. W. Chase {Canad. Thresherman and Farmer, 18 

 (1913), No. 5, pp. 34, 36, 37, figs. 6).— The author advocates the use on small 

 and average-sized farms of a general purpose barn in which the horses, cattle, 

 and young stock are housed practically as a unit with respect to each other and 

 in which the same feedway, haymow space, litter carrier, and track may be used 

 for all. In this connection he gives detailed plans and specifications for the 

 construction of several different arrangements of barn. 



The elements of heating and ventilation, A. M. Greene, Jr. (New York and 

 London, 1913, pp. VI+324, figs. 223). — This book gives in comprehensive form 

 the information and data considered necessary in the proper design of heating 

 and ventilating systems for both large and small buildings. The data are drawn 

 from the experimental work of the author, from the previous works of other 



