500 



SCIENCE 



[N. S. Vol. LIV. No. 1403 



The electrolytic oxidation of hydrochloric acid to 

 perchloric acid: H. M. Goodwin and E. C. Walker. 

 The investigatioa and data present the effect of 

 acid concentration, current density, duration of 

 electrolysis and temperature on the yield of per- 

 chloric acid. A cell yielding- 800 grams of 60 per 

 cent, acid per 24 hours is described. 



Graphic control of electrolytic processes: B. G. 

 Worth. A graphic method of maintaining fixed 

 conditions in potassium chlorate production is pre- 

 sented. Of the three factors which influence the 

 yield, two represent concentrations of 2 compounds 

 one of which is controllable by addition agents, and 

 the third is temperature. 



Friday morning was devoted to a Symposium on 

 Non-ferrous Metallurgy. The papers included were : 



The influence of the electric furnace on the metal- 

 lurgy of non-ferrous metals: H. M. St. John. The 

 use of the electric furnace in brass foundries and 

 refining plants for melting purposes has revolution- 

 ized metal handling methods; a more uniform 

 quality of product is obtained with less labor and 

 less metal wastage. The attainments are better 

 than have been previously possible and the secre- 

 tiveness which has been characteristic of the non- 

 ferrous industry is gradually being done away with. 



Modern developments in tlie British brass indus- 

 try: E. A. Smith. The actual condition of the 

 British brass industry is presented with a discus- 

 sion of electric brass furnaces, hot pressing and 

 forging in brass, rolling mill practice, annealing, 

 etc. 



Hesistance type of electric furnace in the melting 

 of brass and other non-ferrous metals: T. P. Baily. 

 The various features to be considered in making an 

 electric furnace installation for melting non-ferrous 

 metals are discussed. 



Comparison of electric furnace practise with fuel- 

 fired furnace practise: N. K. B. Patch. The 

 author's experiences are that the cost of metal 

 melted, the melting losses, and the solution of gases 

 in metal, are substantially the same in the electric 

 and the fuel-fired furnace, providing intelligent oper- 

 ation is pursued. 



Electric silver melting: H. A. DeFries. De- 

 scribes advantages of electric furnace melting of 

 silver and relates how a more ductile and tougher 

 silver results upon introducing an iron block into 

 the bath. 



Electric furnace melting of nicJcel-silver : F. C. 

 Thompson. Advantages of melting nickel-silver in 

 the externally heated electric furnace are discussed. 



Aluminum-copper alloys: E. J. Anderson. A 

 discussion of the manufacture, properties and uses 

 of the commercial aluminum-copper alloys employed 

 in the United States. 



Secent developments in electric furnaces of the 

 muffled arc type: H. A. Winne. Several types of 

 mufiJed arc melting furnaces are described with 

 their features and adaptabilities. 



Electric furnace purification of zirTcite: J. G. 

 Thompson. The arc type furnace used in this in- 

 vestigation made it possible to remove 90-95 per 

 cent. Si as an impurity from the zirkite ore; the 

 amount of carbon introduced being only sufficient 

 to transform the silicon to the carbide. 



Physical characteristics of specialized refrac- 

 tories. Cross breaking strength at S0° and 1350° 

 C. : M. L. Hartman and W. A. Koehler. The tests 

 were carried out on each of ten refractory materials 

 at the temperatures indicated. 



An Electrodeposition Symposiimi was the feature 

 of the morning of the closing day of the meeting, 

 Saturday, October 1. The papers discussed were: 



.471 electric steam-generator for low voltage: F. 

 A. LiDBURT and F. a. Stamps. An inexpensive 

 form of apparatus for the generation of steam by 

 means of an alternating current of voltages from 

 100 to 500. 



The effect of pressure on overvoltage: H. M. 

 Goodwin and L. A. Wilson. The values of over- 

 voltage of hydrogen against copper, nickel and mer- 

 cury electrodes were determined at pressures vary- 

 ing from one atmosphere to a few centimeters of 

 mercury. 



Researches on the electrodeposition of iron: W. 

 E. Hughes. The results of several experiments and 

 those obtained by the author are related in the 

 electrodeposition of iron from (1) sulphate solu- 

 tions, (2) chloride solutions and (3) sulphate- 

 chloride solutions. 



Electrolytic solution and deposition of copper: 

 T. K. Briggs. 



Electrometallurgy of zinc: W. E. Ingalls. The 

 developments in the electrolytic zinc extraction 

 process and the progress, in Scandinavia, of electro- 

 thermic smelting are set forth. 



Deposition of zinc from the zinc cyamide solvr 

 tion: C. J. Wernlund. This research was carried 

 out vrith the intention of obtaining a zinc cyanide 

 plating solution which would operate successfully 

 under the most trying commercial conditions. 



The electrodeposition of lead-tin alloys: Wm. 

 Blum and H. E. Harinq. That a finer grained de- 



