446 
Technical Problems.—tThe study of track fastenings, including common 
and screw spikes, and tie plates, and the relation of these to the strength 
of ties is in progress. Laboratory tests are supplemented by service tests 
in tracks of railroads under operation. 
TECHNIQUE OF THSTS AND THE ORGANIZATION OF THE LARORATORY WORK. 
The methods and recerds and organization are now well developed. 
The results of experience for the past six years are contained in Circular 
38, (Revised), entitled “Instruction to Engineers in Timber Tests.” Re- 
cently a department of microscopic examination of wood has been added to 
study manner of failures in the tissues, changes in structure resulting from 
heat treatment, location of preservative fluids and allied problems. 
Purdue University. 
Lafayette, Ind. 
