438 



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



No. 12000. No. 12001, 



No. 12026. 



11996. 



14 



SCREW HOOKS, of bright wire. 



No 



Length over all, approx., inches 



Per dozen $0.06 



SCREW PITCH GAGE, see No. 6486. 

 12000. SCREW TAPS, standard. 



. A 

 2 



No. 12032. 



12 



11/3 



.08 



10 



2 



.09 



8 



2V* 

 .12 



B 



4 



C 

 I 



D 

 6 



E 

 8 



G 

 10 



H 

 12 



%2 

 24 



.26 



J 



14 



20 

 .45 

 N 

 % 

 10 

 1.20 



No 



Screw gage No 



Approx. diam., inches % 4 %4 % 4 %4 % 2 %, % 6 



No. threads to inch 56 36 32 40 32 40 32 



Each 44 .30 .26 .26 .26 .26 .26 



No K L M 



Diameter, inches 14 % % 



No. threads to inch 20 16 12 



Each 45 .55 .70 



12001. SCREW TAP WRENCH, for taps %-inch and smaller 1.50 



12002. SCREW TAP WRENCH, for taps % to %-inch 2.00 



12010. SEA SAND for cleaning platinum ware per pound .10 



SEALING WAX, see Wax, Sealing. 



SELENIUM CELLS, see Catalog F of Physical Apparatus. 



F7365. SEXTANT, Metal Model, full size, with which quite accurate work is possible. The main scale 

 is graduated in 20 minute divisions and may be read to 30 seconds by means of the vernier on 

 the index arm. Complete with mirrors, mirror mountings, sight tube, handle and logs for 

 support 22.50 



SHAKING APPARATUS 



12026. SHAKING APPARATUS, Camp's (Patented), used extensively by the United States Steel Cor- 

 poration and other steel and iron laboratories for the rapid precipitation of phosphorus by the 

 molybdic acid method, and for dissolving steel or pig iron for carbon combustion. The disk 

 is made to hold six flasks, Erlenmeyer or Florence shape, from 6 to 24 ounces capacity. Power 

 required to operate, about i^ 5 h. p.; diameter of pulley, 6 inches; proper speed of operation, 

 100 to 140 r. p. m 27.50 



12028. SHAKING APPARATUS, Camp's, same as No. 12026, but with wooden disk and clamps for 

 twelve volumetric flasks of 100 cc capacity. Widely used in sugar analysis 35.00 



12032. SHAKING APPARATUS, Chest of Drawers Design, with polished hardwood chest containing 

 six drawers, with a capacity of eight 250 cc bottles each. Requires % h. p. motor to operate. 

 Complete on hardwood base with enclosed gear but without motor 75.00 



