ABSTRACTS OF RECENT TECHNICAL BOOKS 371 



Rapid Evaluation of Baked Japan Finishes}^ E. M. Honan and 

 R. E. Waterman. The service life of a japan film baked on metal 

 can be evaluated by determining the rate of decomposition of the 

 film when it is placed in an 8.5 per cent phenol-water solution. The 

 effect of the time and temperature of baking the film and the cleanness 

 of the metal previous to applying the japan can also be evaluated. 

 The 8.5 per cent phenol solution is a desirable testing solution because 

 its composition is quite constant at ordinary room temperatures and 

 is not changed by the evaporation of the water. 



Magnetostriction. L. W. McKeehan.^ This paper contains the 

 principal part of three lectures given at the Franklin Institute in 

 April 1926. The history of investigations on the changes in dimensions 

 which accompany magnetization and the changes in magnetization 

 which accompany forcible changes in dimensions is sketched and a 

 classification of the rather complicated cases which have been examined 

 is offered. The bearing of magnetostriction on theories of ferro- 

 magnetism is emphasized and a number of new experimental results 

 are described. A representative bibliography is appended. 



'1 Ind. and Eng. Chem., Oct. 1926, Vol. 18, pp. 1066-1068. 

 1 Journal of the Franklin Institute 202, 737-775 (1926). 



