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



163 



No. 3182. 



Nos. 3178, 79 and 80. 



3178. COMBUSTION TUBES, Clay, Vitrified, C. M. Johnson's, for use in carbon determinations in 



iron and steel. (See Journal of Industrial & Engineering Chemistry, VoL V, No. 7, for July 



1913, page 581.) 



No A B 



Length, inches 23% 27% 



Diameter inside, inches % 1^6 



Diameter outside, inches lUr. 1*4 



Each $4.25 5.25 



3179. TAPEEED CLAY CONNECTORS, for Combustion Tubes Xo. 3178, wi^iout rubber sleeve. 



For tube A B 



Each 1.75 2.00 



3180. BXTBBER SLEEVES for use with Nos. 3178 and 3179. 



For tube A B 



Each 1.75 2.00 



3182. COMBUSTION TUBES, of Best American Porcelain, glazed inside and outside, 60 cm long. 



Thickness of wall, about 3 mm. Diameter inside, mm 15 18 25 



Each 3.25 4.10 4.75 



Note: For special lengths add or subtract 1/100 of price for each em of difference from stock 

 lengths. 



COMBUSTION TUBES, Opaque Fused Silica, melting point about 1500 degrees C.; unaffected 

 by sudden changes in temperature. Length, 60 cm; thickness of wall, 2 mm. 



No A B C 



Diameter inside, mm 15 18 22 



3184. Each unglazed 438 5.25 5.75 



3186. Each glazed 5.63 6.00 7.00 



3187. COMBUSTION TUBES, Pyrex Glass, for use in oxidation and reduction experiments, etc. 



No A B C 



Length, mm 200 300 450 



Diameter inside, mm 5 10 19 



Each 16 .22 .60 



3188. COMBUSTION TUBES, Pyrex Glass, 100 cm long. Thickness of wall, 2 to 3 mm. 



Diameter inside, mm 12 18 20 25 



Each 90 1.50 1.80 2.00 



For COMBUSTION TUBING see No. 7206. 



COMBUSTION TUBES, Transparent Quartz. These tubes can be furnished in any length and 



with wall of three different thicknesses; thin (0.5 mm), medium (0.75 mm) and heavy (1 

 mm). The prices given are per 10 cm of length. 



Bore, mm 1 2 3 5 10 15 20 30 40 50 



3190. Per 10 cm, thin wall. 42 .60 .90 1.20 1.92 2.82 3.90 5.70 9.00 12.00 



3191. Per 10 cm, medium wall 60 .90 1.20 1.80 2.88 4.20 5.70 8.52 13.50 18.00 



3192. Per 10 cm, heavy wall 90 1.20 1.50 2.40 3.90 5.70 7.50 11.40 18.00 24.00 



No. F521. 



No. F523. 



F521. 



F523. 



COMPASS, Eagle Pencil. The most universally used school compass. Pen, pencil, divider and 

 compass combined. Provided vrith set nut. Size 5% inches over all. Complete with extra 



leads Each .30 



Per dozen 3.00 

 COMPASS, Pencil. Easily attached to a common pencil. Solid steel leg, durable and accurate. 



Without pencil Each .15 



Per dozen 1.50 



