Determining the Liquid Limit of Soil - Soil Properties: Testing, Measurement, and Evaluation - page 76

Figure 7-3 Grooving Tool (Optional Height-of-Drop Gage Attached) [5]

Figure 7-4
Height of Drop Gage [5]

(1) Wet Preparation —Except where the dry method of specimen
preparation is specified, prepare specimens for test as described in
the following sections.

(1.1) Material Passes the 425- µ m (No. 40) Sieve:

(1.1.1) Determine by visual and manual methods that the speci-
men obtained according to the first paragraph in this section has
little or no material retained on a 425-µm (No. 40) sieve. If this is
the case, prepare 150 to 200 g of material by mixing thoroughly