A MODIFIED BOERNER SAMPLER. 7 



in a shallow sheet and is divided into as many streams as there are 

 spaces between the partitions at the base of the cone. As every 

 alternate stream falls into one pan, and the intermediate streams are 

 diverted into the other pan, the sample will be divided into ap- 

 proximately equal parts. In order to further divide the sample, it 

 will be necessary only to close the gate and pour the contents of one 

 of the pans — the lower pan will be found to be more convenient to 

 use for this purpose — into the hopper, replace the pan, open the gate, 

 and let that half of the original sample run through the device 

 again. This action can be repeated, pouring always from the same 

 pan, until the quantity of the sample deposited in one pan is the 

 amount desired for analysis. By various combinations, pouring from 



Fig. 4. — A, Botton view of lower cylinder, showing spout at bottom of funnel and 

 shield surrounding this spout. B, Bottom view, upper cylinder, showing bottom of 

 hopper with gate open. 



the same pan every time, as described, or by sometimes using the 

 other, almost any desired size of sample can be obtained, 1 provided 

 the entire contents of the pan being emptied are poured into the upper 

 hopper each time. 



For instance, if the weight of the original sample is 1,000 grams, 

 and it is desired to obtain approximately 30 grams for analysis, the 

 sample should be poured through, or " cut " as it is commonly called, 

 five times. The first cut starts with 1,000 grams, giving 500 grams 

 in each pan; the second cut starts with 500 grams, giving 250 grams 

 in the pan just emptied, and 750 grams in the other; the third cut 



1 U. S. Department of Agriculture Bulletin 574 will be found convenient for use in 

 grain gradiug in connection with this apparatus, as it contains tables of the conversion of 

 the weights of mechanical separations of grains into percentages. 



