PHYSICS — BURGESS. 225 



melting now in use is described in Electrochemical and Metallurgical In- 

 dustry for July, 1906, by Dr. O. P. Watts. 



A large number of alloys and ingots of iron have been prepared, and these 

 have been forged and machined for test bars for examination of physical 

 properties. These tests are not sufl&ciently advanced to enable them to be 

 reported. 



The following publications deal with various phases of the work carried 

 on during the past year : 



Structure of electro-deposits. By C. F. Burgess and O. P. Watts. Trans. Amer. Elec- 

 trochemical Soc, vol. IX, 1906. 



Peculiarities of physical structure of iron deposits are discussed, and the 

 resemblance is shown between electrolytic iron deposits and deposits of 

 various minerals formed in natural processes. 



Observations on the corrosion of iron by acids. By C. F. Burgess and S. G. Engle. 

 Trans. Amer. Electrochem. Soc, vol. IX, 1906. 



It appears that the physical structure, perhaps more than the purity, 

 influences the rate at which iron corrodes. It is shown that unheated 

 electrolytic iron dissolves in dilute sulphuric acid at a rate greater than 

 does zinc, and this fact, together with the greater purity of the resulting 

 hydrogen, appears to make electrolytic iron a useful material for hydrogen 

 generation. 



An electric furnace for heating crucibles. By O. P. Watts. Electrochemical and Metal- 

 lurgical Industry, July, 1906, p. 273. 

 Iron and Calcium. By O. P. Watts. Journal of American Chemical Society, Sept., 1906. 



It is shown that it is difficult, if not impossible, to alloy calcium with iron, 

 at least without the aid of some other element. It does not appear practi- 

 cable to employ calcium for the removal of phosphorus from molten iron. 



Magnetic properties of electrolytic iron. By C. F. Burgess and A. Hoyt Taylor. Trans. 

 Amer. Inst, of Electrical Engineers, vol. xxv, 1906. 



The remarkable influence of heating on the magnetic properties of elec- 

 trolytic iron is shown. Curves are given indicating the magnetic properties. 



Limitations of the ballistic method for magnetic induction. By A. Hoyt Taylor. Phys- 

 ical Review, vol. xxiii. No. 2, August, 1906. 



In Studying the magnetic behavior of an electrolytic iron ring it was found 

 that serious discrepancies occurred when different methods were employed. 

 It was found that a large error was introduced by the step-by-step method, 

 an error which, while present in other forms of soft iron, is especially notice- 

 able in the electrolytic iron tested. This error was found to be due to the 

 magnetic viscosity, and the above paper describes a modified ballistic method 

 of measurement which was devised by the author to eliminate the error 

 ordinarily introduced by this property. 



15— YB 



