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



441 



No. 12090. 



No. 12096. 



No. 12102. 



!^AL SCIENTIFIC 



No. 12104. 



No. 12098. 



No. 12110. 



No. 7398. 



12090. SIEVES, Brass Frame, seamless, having sheet brass bottom with circular perforations. Exten- 



sively used in soil analysis and seed testing. Diameter, 5 inches. 



Diameter of perforations, mm % 1 2 3 5 



Each f $1.40 1.35 1.30 L30 L30 



12091. SIEVES, complete set of five of No. 12090, with brass cover and bottom pan 8.50 



12092. SIEVES, set same as No. 12091, with 3 mm and 5 mm sieves omitted 7.25 



For Cover and Bottom Pans see Nos. 12102 and 12104. 



12096. SIEVE FRAME, same as No. 12090 without bottom pan, but with brass ring for holding bolt- 

 ing cloth. Diameter, 5 inches - 1.00 



12098. BOLTING CLOTH, Silk, for making sieves, etc., of standard weight, 40 inches wide. 



No 2 5 7 9 11 13 15 18 20 25 



Mesh per linear inch.. 52 64 80 96 116 130 148 168 173 200 

 Per linear foot 2.40 2.80 3.00 3.20 3.80 4.60 5.40 7.20 10.00 11.00 



12102. COVERS for Nos. 12084 to 12096. 



Diameter, inches 8 



Each 50 .60 



12104. BOTTOM PANS for Xos. 12084 to 12096. 



Diameter, inches 5 8 



Each 50 .60 



12110. SIEVES, Bureau of Soils Type, as employed in the Laboratories of the Bureau of Soils, Washing- 

 ton, D. C., for mecuanical analysis. Set of four sieves turned from heavy brass castings with 

 bottom pan and cover, each about 2 inches in diameter by 1 inch high, perfectly fitted, so that 

 the set may be well shaken without coming apart. Shaped so that there is no loss of the 

 sample, a great advantage where small samples are being tested. Sieves proper are readily re- 

 placeable; upper two of brass, with perforations 1 mm and 0.5 mm in diameter; lower two of 



bolting cloth 64 and 130 mesh per set 10.00 



For Shaker for Xo. 12110 Sieves, see Xo. 12148. 



12114. SIEVES, Cement, Bureau of Standards Typa, Brass Frame, seamless, of woven brass screen, 20 

 cm in diameter and 6 cm high, with certificate of the United States Bureau of Standards. 



No A B 



Mesh 100 200 



Size of openings, inches 0.0055 0.0029 



Each 8.00 15.00 



7398. SIEVES, Corn Test, according to specifications of the United States Department of Agriculture. 

 The set consists of one sieve with 14/64 inch round holes, and one bottom pan, of aluminum, 

 13 inches in diameter by 3 inches deep .- 4.50 



12120. SIEVES, Sand, Bureau of Standards Type, Brass Frame, seamless, of woven brass screen, 20 cm 

 in diameter and 6 cm high, with certificate of the United States Bureau of Standards. 



No A B 



Mesh 20 30 



Size of openings, inches 0.0335 0.0223 



Each 6.25 6.25 



