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



445 



No. 12228. 



No. 12234. 



SOIL ANALYSIS APPARATUS 



INCLUDING APPARATUS FOR PHYSICAL PROPERTIES OF SOILS 



(Arranged Alphabetically.) 



12220. ABSORPTION APPARATUS, Heat, for absorption of heat by soils, as described by Steven- 

 son & Schaub. This apparatus is nsed to compare the temperatures of various soils at differ- 

 ent depths when the soils are exposed to the direct rays of the sun, and consists of four zinc 



boxes 4x4x8 inches deep, enclosed in a wooden box open at the top $5.00 



12222. ABSORPTION APPARATUS, Moisture, for determining the power of dry soils to absorb hygro- 

 scopic moisture from a saturated atmosphere. A water-tight, water-proofed substantial 

 wooden box with heavy cover so designed that it may be clamped air-tight to the box. (A 

 metal box is not satisfactory, because it is so affected by temperature conditions that the 

 results obtained have little or no value.) Wooden strips, not shown in the illustration, sup- 

 port the soil pans and have a device for holding the strips of absorption paper which by 

 capillary action absorb water, keeping the air within the box in a saturated condition. Com- 

 plete with six soil pans 17.50 



SOIL PAN of zinc, 6%x6%xl% inches, as used in Xo. 12222 Absorption Apparatus. These pans 

 are water-tight and will be found convenient for use in drying ovens. Each 30 



ASPIRATOR, McCall, for studying the rate of the flow of water through soils of different tex- 

 tures. This aspirator has no moving parts to cause errors from friction and the method of 

 operation is exceedingly simple. The bottle is first filled with water to a definite mark on 

 the scale and connections are made as shown in the illustration. The pincheock is then 

 opened and water allowed to run from the bottle until it stands at a much lower level. By 

 noting the time required with different soils, the relative rate of flow is readily determined. 

 Complete as illustrated, with metal support, but without soil tube or beaker 8.00 



SUPPORT only of No. 12228 3.00 



ASPIRATOR BOTTLE only of No. 12228. Complete with rubber stoppers, rubber tubing, and 

 pincheock 5.00 



ASPIRATOR, for determining the comparative porosity of soils by measuring the rate of flow 

 of air through them under constant pressure. This apparatus consists essentially of a closed 

 pressure chamber formed by a rubber diaphragm or bag placed between a movable weight 

 and a wooden base 15 inches in diameter. To the weight is attached a graduated rod, by 

 reference to which definite quantities of air may be forced through the different soils under 

 consideration. The pressure chamber is enclosed in a suitable casing for protection.. 17.50 



12223. 



12228. 



12229. 



12230. 



12234. 



