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



459 



No. 8386. Nos. 12500-6. 



No. 12479. 



Nos. 12487-8. 



No. 1876. 



12476. 

 12478. 



12479. 



12484. 



124S6. 

 12487. 



12488. 

 8386. 



12492. 



12494. 

 12496. 



1876. 

 12500. 



For ORGANIC MATTEB, TUBES, see Xo. 12464. 



TUBE, Percolation of Air, for comparing the rate of the flow through soils. Made of brass, 

 18 inches long by 2 inches in diameter, with outlet tube near bottom $2.00 



TUBE, Percolation of Water, for determining the rate of percolation of water through soils. Of 

 brass, 18 inches long by 2 inches in diameter, with lateral inlets and drainage tube, and with 

 solid bottom below and perforated bottom above drainage tube 2.00 



SUPPORT BLOCK, for use with Xo. 12478 Percolation Tube. This block is necessary when 

 several soils are to be compared 1.75 



For CLEANING BRUSH, see Xo. 1876. 



TUBE, Specific Gravity, for determining the apparent specific gravity of surface soils under 

 field conditions. Of steel, 12 inches long by 3 inches outside diameter, with cutting edge 2.75 



TUBE, Specific Gravity, same as Xo. 12484, but 4 inches inside diameter 5.00 



DRIVING HEAD, of cast iron, for use with Xo. 12484 Specific Gravity Tube to prevent bat 

 tering the upper edge when the tube is driven into the ground 50 



DRIVING HEAD, same as Xo. 12487, but for use with Xo. 12486 Tube 1.50 



MAUL for driving Xo. 12484 Specific Gravity Tube. Substantially made of iron with hardwood 

 faces. The handle is two feet long, and the Maul is sufficiently heavy for its purpose, with- 

 out being clumsy net 1.40 



TUBE, Volume Weight, for determining volume weight and pore space. Of brass, 12 inches 

 long by 2 inches in dameter, with solid bottom, and crease one inch from the top 1.25 



TUBE. Volume Weight, for elementary work, of brass, 1^x3% inches 40 



TUBE, Water Holding Capacity, brass, 12 inches long by 2 inches in diameter, with perforated 

 bottom, !*>? mm perforations, and crease one inch from top 1.25 



TUBE BRUSH, for cleaning soil tubes of 2 inch diameter; has a wooden handle 3 feet long and 

 is provided with a tuft of bristles at the end for reaching the bottom corners of the tube .60 



TUBES, Soil, so constructed that one style of tube may be used for all experiments. They are 

 made from brass tubing 10 inches long and 2 inches in diameter. A cast brass base, which is 

 corrugated on its upper surface, is soldered into the bottom of the tube. On the lower sur- 

 face of this casting is a connection for rubber tubing. A brass disk with circular perfora- 

 tions, and somewhat smaller than the inside of the soil tube, is dropped to the bottom of the 

 tube and rests on the corrugated surface of the brass base, allowing free passage of air or 

 water through the tube. The tubes are so constructed that they can be connected in series 

 bv means of rubber tubing so that a constant water level may be obtained in all the tubes. 

 ' Each 1.50 



