SAMPLING AND TESTING HIGHWAY MATERIALS. 
25 
(49) The time of setting shall be determined by the Gillmore needles. The Gill- 
more needles should preferably be mounted as shown in figure 12 (b). 
(50) The time of setting shall be determined as follows: A pat of neat cement paste 
with about a 3-inch diameter and one-half inch thick, with a flat top, mixed to a 
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normal consistency, shall be kept in moist air at a temperature maintained as nearly 
as practicable at 21° C. (70° F.). The cement shall be considered to have acquired 
its initial set when the pat will bear, without appreciable indentation, the Gillmore 
needle one-twelfth inch in diameter, loaded to weigh one-fourth pound. The final 
