LABORATORY SUPPLIES AND CHEMICALS 



The valuable optical properties of quartz crystal, recognized for hundreds of years, 

 were responsible for the earliest attempts to fuse this material into a homogeneous 

 glass. Although most entirely without success for many years, these early efforts 

 revealed the special physical qualities of Quartz Glass, which have since secured for 

 it such an important position among laboratory apparatus. Its melting point lies 

 800C (1400F.) higher than that of common glass, and it may be subjected without 

 misgiving to the greatest and most sudden temperature changes. The coefficient of 

 expansion of Quartz Glass, between 0-1000 C is 0,00000054; i. e., a rod of Quartz 

 Glass 1 meter long at 0C expands 0.54 mm. when heated to 1000C. 



3711(b) BEAKERS (with or without lip). 



Capacity, cc ............... ____ ........... 25 50 100 200 250 



$5.00 7.50 12.50 18.00 21.00 



3711 (c) BOATS, Combustion. 



r 



50x8x5 millimeters .................................................. $3.75 



. 05x8x5 millimeters .................................................. 5.00 



75x8x5 millimeters ................................................. 6.50 



3711 (d) CRUCIBLES. The dimensions in list below refer to crucibles of the (tall. 

 narrow) Platinum shape, which is always furnished unless Berlin Porcelain 

 shape (low, wide) is specified. Prices are the same, capacity for capacity, 

 in either shape. 



Capacity Diameter at Top Price, each Price of lid Price of Rose lid 



cc. mm. (without lid) (for tall shape) with delivery tube 



10 28 $3.60 $1.25 $3.00 



20 35 6.00 1.75 3.75 



30 40 8.40 2.50 



40 45 9.25 2.75 



50 50 12.00 3.00 



60 54 13.75 3.50 



80 58 16.75 3.75 



100 65 20.00 4.00 



Prices for lids for Berlin porcelain shape are as for next larger size in tall shape. 

 Gooch crucibles having 7 holes, 2 millimeter diameter in bottom can be supplied at 

 50 per cent increase on above prices. 



3711(e) FLASKS can be furnished of ihe Standard shape as illustrated with long, 

 narrow or short wide necks, an.d with round, or flat bottoms, as may 

 be specified. Made also in Erlenmeyer shape. 



Capacity, cc 15 25 50 100 150 200 250 500 750 1000 



$3.30 4.50 6.00 10.75 14.50 19.25 24.00 30.00 37.50 43.50 



Extra for side neck.. 2.00 2.00 2.10 2.50 2.65 3.00 3.00 3.25 3.40 4.00 

 Extra for ground-in 



stopper 1.50 1.80 2.50 3.00 3.60 4.25 4.80 6.00 7.80 9.60 



We call your attention to the sections on the various types of 

 Electric Furnaces and also to the section on Furnace Cements. We 

 are prepared to furnish in from one pound to barrel lots. 



