CEXTBAL SCIENTIFIC CO., CHICAGO, U. S. A. 



457 



No. 12444. 



No. 12448. 



No. 12454. 



No. 12445. No. 12434, 



12430. TENACITY OF SOILS APPARATUS, for determining the tenacity of moist soils. In this new 

 and improved design, which has been daveloped from the original in use at the University of 

 Illinois, the inaccuracies due to friction, caused particularly by a collection of dirt on the 

 moving parts of the- instrument, have been completely obviated, and constant conditions 

 thereby assured. Two brass soil containers are supported on a hinged frame which in turn 

 is securely clamped to the table top. The soil containers are removable from the frame and 

 are so constructed that they may be immediately replaced in exactly the same relative posi- 

 tion. In use, the containers are'held firmly together by means of the metal stirrup shown in 

 the illustration; the moist soil is compacted in the containers and smoothed level with the top, 

 thus leaving one square inch section for testing. Weights are now placed in the hanger suf- 

 ficient to pull the soil apart. Complete, as illustrated, with canvas hanger, but without 



weights $12.00 



THERMOMETERS, Soil, see general heading Thermometers. 



12434. TRAY, Color, for testing effects of color of soils on temperature. Waterproofed wooden tray, 

 6 ft. x 3 ft. x 6 inches deep, with drainage 15-00 



12436. TRAYS, Drainage, for showing effects of drainage on temperature of soils. Two water-proofed 

 wooden travs, each 3 ft. x 4 ft. x 6 inches deep, one made water tight, the other provided 

 with drainage Per set 25.00 



12438. TRAY, Puddling, for mixing and working soils. Water tight, waterproofed wooden tray, 2 

 inches x 25 inches x 2% inches. ' Will not warp 3.50 



TUBES, SOIL, ALL KINDS 



12444. TUBE, Capillarity, McCall. with side tubes for studying the distribution of moisture in vertical 



columns of soil; also for determining the lateral movement of capillary moisture. Of brass, 

 36 inches long by 2 inches in diameter, with perforated bottom and small lateral tubes at 

 definite intervals 3.75 



12445. TUBE, Sampling, for use in obtaining samples from the side openings of No. 12444 Capillarity 



Tube as suggested by Prof. John A. Slipher of Purdue University. A brass tube with diam- 

 eter slightly contracted at the sharpened end is provided with a plunger by which the sample 



of soil may be ejected 90 



12448. TUBE, Capillarity, McCall, for determining the rate of the capillary rise of water in soils. Of 

 brass, 36 inches long by 2 inches in diameter, with perforated bottom. Running lengthwise of 

 the tube is a slot fitted with a window of thin celluloid through which the moisture height 

 may be noted. The construction of this tube is such that an additional length, which the 

 illustration shows in place, may readily be attached. Without additional length 4.50 



12450. TUBE, Extension, with coupling for studying rise of moisture to greater height than is possi- 



ble with Xo. 12448 alone. Of brass, 36 "inches long. 

 With coupling 5.00 



12451. CELLULOID STRIP, 36x3 inches, for either Xo. 12448 or Xo. 12450 60 



12454. TUBES, Capillarity, of celluloid protected by wire gauze. These tubes consist of a cylinder of 



galvanized iron wire gauze 2 inches in diameter, surrounding a cylinder of thin transparent 

 celluloid formed of a strip of celluloid sufficiently wide to go 1% times around the tube. 

 These tubes are soil tight, transparent, and durable, and are very satisfactory for studying 

 the distribution of water in capillary *ise experiments, since the inner tube may be with- 

 drawn and unrolled, exposing the soil for easy sampling. 



Length, inches ." 12 24 36 48 



Each . 66 1.00 1.50 2.80 



