68 BULLETIN L216, CJ. S. DEPARTMENT OF AGRICULTURE. 
passing the sample through such of the following sizes of screens 
having circular openings as are required or called for by the speci- 
fications, screens t<> be used in order named: SI inch (8.89 centi- 
meters). 3 inch (7.<Y2 centimeters), 21 inch it;.:;.", centimeters), 
2 inch (5.08 centimenters), H inch (3.81 centimeters), 1] inch 
(3.18 centimeters), i inch (2.54 centimeters), three-quarter 
inch (1.09 centimeters), one-half Inch (1.27 centimeters), one- 
quarter inch (0.64 centimeters) ; (3) determining the percentage 
by weight retained on each screen; and 1 4 1 recording the me- 
chanical anaylsis in the following manner: 
Per cent. 
Passing one-quarter-inch screen 
Passing one-half-inch screen and retained 
on a one-quarter-inch screen 
Passing three-quarter-inch screen and re- 
tained on a one-half-inch screen 
Passing 1-inch screen and retained on a 
three-quarter-inch screen 
Passing U-inch screen and retained on ;i 
1-inch screen 
100. 00 
MECHANICAL ANALYSIS OF SAND OR OTHER FINE HIGH- 
WAY MATERIAL, EXCEPT FINE AGGREGATES USED IN 
CEMENT CONCRETE. 
(A. S. T. M. standard method, serial designation D 7-18, slightly 
modified.) 
The method shall consist of (1) drying at not over 110° C. 
(230 F.) to constant weight a sample weighing 50 grams; (2) 
passing the sample through each of the mesh sieves (American 
Society for Testing Materials standard sieves) specified in 
Table 3; 1B (3) determining the percentage by weight retained 
on each sieve, the sifting heiug continued on each sieve until 
less than 1 per cent of the weight retained on each sieve shall 
pass through the sieve during the last minute of sifting; and 
(4) recording the mechanical analysis in the following man- 
mer : 
Per cent. 
Passing 200-mesh sieve 
Passing 80-mesh sieve and retained on 
200-mesh sieve 
Passing 40-mesh sieve and retained on 80- 
niesh sieve 
Passing 10-mesb sieve and retained on 10- 
mesh sieve 
100.00 
«The order in which the sieves are to lie used in the process of sifting 
is immaterial and shall be left optional; but in reporting results the order 
in which the sieves have been used shall be stated. 
