188 



EXPERIMENT STATION RECORD. 



Twenty-first annual report of the Massachusetts Highway Commission 

 (Ann. nj)t. Mass. nUjhway Com., 21 (1913). pp. 21.',, pis. 6, figs. 7).— This report 

 covers finances, administration, construction, and maintenance for the year 

 ended November 30, 1913. 



Permanent construction (Scatle, Wash., 1911,, pp. 5 J,, figs. 37). — This pam- 

 phlet deals in a popular manner with the selection, testing, and measuring 

 of cement, sand, gravel, or crushed rock, and gives information as to methods 

 of mixing them in the proper proportions for the manufacture of concrete. 

 It points out also how to improvise tools and build the mixing board, measuring 

 boxes, and forms for a large number of permanent improvements around the 

 home and on tlie farm. 



The use of Iowa g'ravel for concrete, T. R. Agg and C. S. Nichols (loioa 

 Engin. Expt. Sta. Bui. 34 {191J,), pp. 29, figs. 9; al)S. in Good Roads, n. ser., 7 

 {191J,), No. 23, pp. 326, 321 ) . — The contents of this bulletin comprise the results of a 

 survey of deposits of concrete materials made by the Iowa Highway Commission. 



A table to figure brickwork {Brick and Clay Rec, 1,5 (1911,), No. 5, p. 1,13, 

 fig. 1). — A table is given by means of which one may calculate the number of 

 bricks required for any common types of brickwork. 



Pocketbook of useful formulas and memoranda for civil, mechanical, and 

 electrical engineers, G. L. and H. B. Moles worth {Nexo York, 1913, 27. ed., 

 pp. 9U, figs. 800; rev. in Engin. Rec, 69 {191J,), No. 7, p. 202).— A revision of 

 this handbook. 



Agricultural machines and implements, J. Hagmann (Jahresher. Landic, 

 28 {1913), pp. 1,97-532, figs. 20). — A number of reports on tests of agricultural 

 machinery are briefly reviewed. 



Motor-plow tests, 1913, G. Fischer (Ar6. Deut. Landw. Gesell., No. 260 

 (1914). pp. 55, figs. 23). — This is a detailed report of trials of 9 mechanical 

 plowing outfits, including one 2-engine and cable system, 5 tractors, and 3 motor 

 plows. The total trials included preliminary, general, duration, and brake tests. 



The mechanical details of each machine and the methods of testing are 

 described in full, and the test results reported in tabular and graphic form and 

 discussed for each engine. The machines were tested on level ground and on 

 ground with a heavy grade. The more important results obtained are sum- 

 marized in the following table : 



Results of motor-plow tests. 



Type of outfit. 



Two engines and cable 

 plow. 



Tractor and plow 



Do. 



Do. 

 Do. 

 Do. 



Motor plow. 



Do 



Do 



Normal 



brake 

 horse- 

 power. 



24.1 



64.7 

 46.3 

 65.3 



25.2 

 45.5 

 5L2 

 60.2 



Drawbar 

 horse- 

 power. 



19.0 



36.2 

 29.6 

 44.4 



17.0 

 28.2 

 34.6 

 39.3 



Plowing 

 depth. 



Inches 

 10. 



lo! 



7. 

 10. 



8. 

 11. 



7. 



8. 

 10. 



9. 

 12. 



7. 

 10. 



Plowing 

 width. 



Inches. 

 45.0 



95. 



40.0 



87. 

 72.0 

 34.2 



65.0 



82.0 

 68.0 



88.0 



Hourly 

 capacity. 



Acres. 

 1.05 

 1.04 



1. 7S 

 1.94 



.82 

 1.28 

 1.68 



2. IS 

 .99 

 .68 

 .74 



1.48 

 1.53 

 L29 

 L39 

 L35 

 1.62 



Typo of fuel and 

 "heat units per 

 pound. 



jCrude oil (4,200)... 



jcitin (4,325) 



JBenzol (4,360) 



JBenzine (4,5.50).... 



Benzol (4,360) 



|....do 



....do 



....do 



....do 



Fuel con- 

 sumption 

 per acre. 



Pounds. 



17.5 



15.0 



27.8 



21.8 



22.8 



26.4 

 18.3 

 33.4 

 34.1 

 26.5 

 24.8 

 19.2 



2L2 



23.7 

 18.3 



