644 



Journal of Agricultural Research 



Vol. X, No. 12 



SPLASH FROM AN ELEVATED HORIZONTAL SURFACE 



The total impetus of the splash drop is not expended in the experi- 

 ments described above as is shovv^n by the results obtained when the surface 

 of impact is elevated above the counter. These observations were made 

 with drops falling i6 feet upon a glass plate and a wet blotting paper sur- 

 face elevated 24 inches above the counter, and the results are tabulated 

 in Table III. In the case of the 0.02-c. c. drop falling onto the glass 

 plate data are given for elevations of 3, 4, and 7 feet. 



Table III. — Distance {in inches) of splashes from horizontal surfaces, drops falling 



16 feet 



Size of 

 drop. 



Surface of impact. 



Maximum distance after many (100+) 

 drops had fallen. 



Elevation of surface above counter inches . . 



36 



C.c. 

 O. I 



.06 



.04 



. 02 



f Blotting paper. 

 1 Glass plate .... 

 f Blotting paper. 

 [Glass plate .... 

 f Blotting paper. 

 \Glass plate .... 

 (Blotting paper. 

 \ Glass plate .... 



56 

 48 

 46 

 40 

 40 

 38 

 34 

 34 



64 

 72 

 56 

 64 

 54 

 56 

 36 

 40 



42 



42 



SPLASH FROM AN INCLINED SURFACE 



The orientation of the splash drops from a glass plate inclined 45° at 

 the level of the counter differed from those from the level plate. With 

 the semicircles of the counter divided into one central quadrant and two 

 bordering octants and the centers coinciding with the point of impact, 

 the splash drops arranged themselves in greatest numbers over the 

 octants at the sides. Fewer drops fell just within the limits of the quad- 

 rant, while more fell along the median line. The latter never attained 

 the distance of those at the sides. When leaving the point of impact, 

 they ascend very little, if at all, but travel outward and downward. 

 Those going to the sides ascend at first and then fall, similarly to the 

 splash drops from a level surface. 



As in this case, too, the total impetus is not expended when the surface 

 is at the level of the counter. With the elevation of the inclined surface 

 the net result of the glancing blow of the falling drop is observed. Those 

 splash drops traveling along the median line of the counter — that is, at 

 right angles to the inclined surface — increase in extreme distance until 

 the optimum elevation is reached, where they exceed the distance of 

 those going to the sides. The results of the 0.02-c. c. drop falling 16 

 feet upon the glass plate level and inclined 30° and 45° at various eleva- 

 tions above the counter are given in Table IV. It is to be noted that 

 the maximum distance of splash is least from the level plate and greatest 

 from that inclined 30°. 



