452 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 



Nos. 12342-3. 



Nos. 12346-8. 



No. 12350. No. 12351. 



No. 12354. 



SOIL SAMPLING APPARATUS 



12342. 



12343. 

 12346. 



12348. 

 12350. 



12351. 

 12352. 

 12354. 



SOIL AUGER for obtaining soil samples. Length 36 inches with graduations every 6 inches; 

 handle detachable; steel cutting edge 1% inches in diameter. The length may be increased 

 to 72 inches by the insertion of No. 12343 Extension. Complete with handle but without 

 additional length $3.50 



EXTENSION of 36 inches for use with No. 12342 1.00 



SOIL AUGER, improved form with stem and handle of smooth finished steel. The handle is 

 attached by means of a lock nut of new design which entirely does away with the loosening 

 and tightening up at the joint which has caused so much difficulty in the earlier types of Soil 

 Augers. This Auger has been made 24 inches long for convenience in carrying when in the 

 field. For use at greater depths extensions 2 feet long and 4 feet long have been provided. 

 (See Nos. 12351 and 12352.) The auger bit is 1% inches in diameter and the stem is gradu- 

 ated every 6 inches. This is a thoroughly high-grade tool for the most exacting service 7.50 



SOIL AUGER, same as No. 12346 but with auger bit 2 inches in diameter 9.00 



SOIL AUGER, with Sleeve, for use in dry soils. This Auger is the same as No. 12346 except 

 that it is provided with a steel sleeve wh.ch fits over the auger bit, resting on a projection at 

 the lower end so that the diameter of the cutting edges is larger than the outside diameter 

 of the sleeve. This sleeve is held firmly in position at the upper end by an ingenious lock- 

 ing device and serves to hold in position the dry soil which otherwise would not cling to the 

 Auger when removed from the ground. 2 feet long, graduated every 6 inches. Complete with 

 sleeve and handle 9.00 



EXTENSION, for use with Nos. 12346 to 12350 Soil Augers. Complete with lock nut. Exactly 

 24 inches long and graduated every 6 inches 3.00 



EXTENSION, for Nos. 12346 to 12350 Soil Augers. Same as No. 12351 but exactly 48 inches 

 long 4.00 



SOIL AUGER, Nebraska Design, designed for general work in soil investigation; especially 

 adapted to work where samples at exact depths are desired, since with this instrument it is 

 possible to secure samples of soil one inch in thickness to a total depth of two feet. This type 

 of auger has been used with satisfactory results by the Nebraska Agricultural Experiment 

 Station in securing samples of soil for chemical analysis and soil moisture studies. The auger 

 is also well adapted for use in making determinations of the apparent specific gravity of 

 soils under field conditions, since a definite volume of soil may be removed without the neces- 

 sity of digging around a tube and cutting the soil off even with the lower edge. 



In use the auxiliary tube is driven into the soil to such a depth that when the auger blade 

 is just resting on the surface of the soil, the adjustable gage may be set in the first notch on 

 the auger stem, and at the same time rest on. the top of the tube. The gage is then raised 



