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



449 



No. 12278. 



No. 5644. 



No. 12282. 



No. 12286. 



No. 12276. 



DRAINAGE AND WATER TABLE APPARATUS, Continued. 

 Some Things Which the Apparatus Will Show: 



Tile drains do not remove capillary water. A deep drain removes the first water. 



Xo water is removed until the soil at the drain line is beyond the point of saturation. 



The volume of soil available for plant food is greater in a drained soil. 



The volume of soil retaining capillary water is greater where the drains are deep. 



Plant food would not be wasted by leaching from a barnyard having a tight floor of elay or 

 cement and some kind of retaining wall around the outside $7.50 



DRYING OVENS, see general heading Ovens. 

 5644. ELUTRIATING FLASK, Benningsen's. The bulb has a capacity of about 400 cc, and the neck 



is graduated to 40 cc in 1 ce divisions 1.50 



12270. EVAPORATION GAGE, micrometer screw form, for measuring rate of evaporation, as described 

 in Bigelow's "Manual for Observers in Climatology and Evaporation" (TJ. S. Weather Bu- 

 reau Xo. 409). A micrometer screw is mounted on a cap suitable for supporting it on the 

 top of a still well 3 inches in diameter. The screw proper is 5 inches long with 20 threads to 

 the inch. The micrometer head is graduated in 50 divisions so that readings may be taken to 

 *iooo f an inch. For convenience in reading a linear scale graduated in 20ths of inches is 

 provided. The total distance from the head to the end of the pointer, which is of incorrod- 

 ible material, is 12 inches. The pointer may be unscrewed and a hook screwed in its place, 

 thus making the instrument serve as a hook gage. Complete as described, with pointer and 



hook 12.00 



1227S. EVAPORATION TANK for use with Xo. 12276 Evaporation Gage, of heavy galvanized iron 

 6 feet in diameter by 2 feet deep. A still well 3 inches in diameter is firmly attached to one 

 side of the tank and connected with the tank at the bottom by a galvanized pipe of sufficient 

 size to allow free flow of water between the tank and still well 50.00 



Note. Tanks of different dimensions can be furnished if desired. 



12282. EVAPORIMETER, for determining the amount of water evaporated from the surface of various 



soils in a given time; for determining the effect on evaporation produced by different fertil- 

 izers, and different methods of cultivation. It consists of a brass tube 4 inches in diameter 

 and 9 inches long having a perforated metal bottom to allow free ingress of water. This tube 

 fits" into a water-tight spun brass base. 



In operation the tube is filled with soil which is compacted by means of the Soil Compacting 

 Machine (Xo. 12256). It is then placed in position in the base. Water of known weight is 

 placed in the base whence it passes through the perforated bottom of the tube to the soil 

 and is evaporated from its surface. 



The apparatus is entirely of brass, durably made, highly polished and lacquered 5.00 



12283. EVAPORIMETER, same as Xo. 12282, but with brass tube 18 inches long 5.50 



12286. EVAPORIMETER, for finding the co-efficient of evaporation from soils. The soil container is 



of copper with brass bottom perforated with one millimeter circular openings. This container 

 is placed in a copper water jacket 3x8 inches 3.50 



