188 EXPERIMENT STATION RECORD. [Vol.40 



figs. 6). — The general conclusion from the results of two years' observations on 

 a well in proximity to the River Thames is that the river " is not only the pre- 

 dominating factor in deciding the movements of subsoil water, but also that 

 every variation of level in the river, whether periodic or casual, must to some 

 extent affect the water level." 



Graduated slope gauge and movable stilling box, W. G. Steward (Reclam. 

 Rec. [U. 8.1, 9 (1918), No. 11. pp. 538-540, figs. 4)-— A combination of gauge and 

 stilling box is described, which has given the best results for general use of 

 any of the several forms tested by the author during many years of work on 

 canal measurements. 



Calaveras Dam slide. — Report on failure of hydraulic fill dam during con- 

 struction, D. C. Hen-ny ami G. H. Swigakt (Reclam. Rec. [V. g.], 9 {1918), No. 

 9, pp. 433-435, figs. 2). — The general conclusion of this investigation is that a 

 sliding factor of about 0..""> for the dry mixed rock and earth till used in the 

 dam is safe, but that when this factor reached 0.8 sliding took pli 



Hydraulic sluicing for blanketing porous canal banks. Sun River project, 

 R. B. Stevens Reclam. Rec. [U. S.], .'' (191S), No. 3. pp. 225-127, figs. .',).— This 

 is a report of experiments in which electrically driven pumping plants were 

 installed at various points on the upper slope of a canal, where suitable mate- 

 rial was found and ground-sluiced into the canal in such a manner that it 

 was carried down the canal in suspension and gradually deposited as a blanket 

 over the sides and bottom. Oosl data are included. 



Pumping on irrigation projects, J. M. GATLOBD (Reclam. Rec. [U. 8.]. 9 

 (1918), No. ... pp. 75-79, figs. 4). — The author deals with centrifugal pumps 

 screw pumps, SCOOP wheels, hydraulic rams, and boosters, and gives data OH 

 costs. He concludes in general that the success of a pumping plant depends 

 upon accurate determination of the physical data, the selection of apparatus 

 adapted to the conditions, and systematic attention to details of operation and 

 maintenance of equipment 



Pumping from wells, J. M. GATLORD t Rcelam. Rre. [U. S.]. .'' [1918), No. 10, 

 pp. 485-4S7. figs. 2). — This article gives data bi ly on Irrigated an 



of southwestern United States, and calling attention particularly to the use of 

 an automobile online for power pumping. 



Control of algas by copper sulphate. R. K. Tiffany [Reclam. Rec. [U. 8.], 

 9 (1918). No. 11. p. 581). — Experiments on the Tieton canal of the Yakima 

 project are reported. The designed capacity of the canal when clean was ." 

 see.-ft., with a freeboard of 7 in., based on a value of Kutter's »=0.012. The 

 growth of algee for a certain time was found to raise the value of Kutter's 

 n to 0.014. 



Copper sulphate to the amount of 2"<> lbs. was suspended in burlap sacks In 

 the water near the head of the canal, the entire quantity being dissolved in 

 three or four hours. The canal was cleared of alg« within a week, and no 

 deleterious effects were noted upon vegetation supplied with water thus 

 treated. 



Terracing farm lands, C. E. RAMSEB [U. 8. Dept. Agr., Farmers' Bui. 997 

 (1918). pp. 40, fig.s. 38). — Systems of terracing farm lands to prevenl erosion are 

 described, including the bench and the narrow and broad base ridu'e tyi 

 The methods employed in building terraces and their subsequent care are out- 

 lined. A more technical treatment of the subject has been presented in a ] 

 vious publication (E. S. R., 37, p. S7). 



Public Roads (I '. 8. Dept. Agr.. Public Roads. 1 [1918), No. 5. pp. .}S. figs. 

 SO). — This number of this publication Includes the following articles of special 

 engineering interest: Utilizing Local Stone, by G. E. Lack! ; Maintaining Earth 



