492 EXPERIMENT STATION RECORD. (Vol. 38 



volved showed less resistance than tests ... in which the surface was on 

 plank." 



The tests were made under the supervision of the agricultural engineering 

 division of the University of California in cooperation with the California 

 Automobile Association. 



Charts for the use of road-oil inspectors, E. E. Glass (West. Engin., 8 

 (1917), No. 9, pp. 350, 351, figs. 5). — These five charts give data on volume of 

 cylinders, contents of partly filled horizontal tanks, spread of | and i gal. per 

 square yard, and thermal corrections for road oil. 



A kerosene carbureter, T. C. Menges (Oas Engine, 19 (1911), No. 7, pp. 

 31G-31S, fig. 1). — This article describes a kerosene carbureter for a throttle- 

 governed engine and gives a mathematical discussion of the design for a particu- 

 lar size of engine. Experiments are also described to determine the proper loca- 

 tion of the kerosene nozzle in the inlet pipe. 



It is concluded that In order to operate successfully on kerosene it is neces- 

 sary to heat up the mixture and keep it hot until it is exploded. Water must 

 be admitted to the mixture in proportion to the work being done, and the en- 

 gine must be throttle governed. The inlet orifice should be as small as possible 

 in order to break up the liquid kerosene, and means must be provided for 

 starting the engine on gasoline and gradually switching from gasoline to 

 kerosene. 



A laboratory manual in farm machinery, F. A. Wirt (New York: John 

 Wiley d Sons, Inc., 1917, pp. XXII +162, figs. ^2).— This manual is intended as 

 a laboratory guide which will not be affected to an appreciable extent by ordi- 

 nary changes in farm machinery construction. It is considered suitable for 

 university students, and is arranged with the idea in mind that the questions 

 a.sked will lead students to draw their o^vn conclusions as to which machines 

 are best adapted to the various agricultural conditions. 



Part 1, Farm Field Machinery, contains chapters on machinery used in 

 preparing the soil, seeding, cultivating, grain and corn harvesting, hay harvest- 

 ing, pumping, and miscellaneous work. Part 2, Power Farming Machinery, 

 contains chapters on power drawn and belt driven machinery. Part 3, Farm 

 Mechanics, contains chapters on rope, belts, babbitting, soldering, and pipe 

 cutting. The largest section on a single subject is that devoted to rope, which 

 includes discussions of methods of preventing the untwisting of rope ends, loops 

 at the rope ends and between the ends, knots for tying ropes together, hitches, 

 halters, and block and tackle. 



Instructions to students and exercises are also included. 



Markets for agricultural implements and machinery in Chile and Peru, 

 F. H. voN MoTz ( U. S. Dept. Com., Bur. Foreign and Dom. Com., Spec. Agents 

 Ser., No. 142 (1917), pp. 48). — This report deals with the markets for agricul- 

 tural implements and machinery in Chile and Peru. It is stated that the 

 west coast markets are distinctly less promising than those of the farming 

 countries in the eastern part of South America. 



Heat losses through buildings and building materials, R. S. Hawley 

 (West. Engin., 8 (1917), No. 9, p. 344, fiff- !)■ — Graphic data are given on hciit 

 loss through building materials which may be of value in designing farm 

 buildings and their heating systems. 



Fire prevention and fire fighting on the farm, H. R. Tolley and A. P. 

 Yeekes (U. S. Dept. Agr., Farmers' Bui. 904 (191S), pp. 16, figs. 2).— The pre- 

 ventable nature of most farm fires is pointed out, and means of fire preven- 

 tion and fire fighting are described. 



