384 NOTES ON DOCKS AND DOCK CONSTRUCTION. 



According to another set of experiments made by Mr. 

 Tscharner, in the testing laboratory of the University of Illinois, 

 U.S., the holding power of a 1-inch round bolt driven into a 

 j- J-inch hole in pine, was 6000 Ibs. per lineal foot. 



In oak, under the same conditions, the holding power was 

 found to be 15,600 Ibs. per foot lineal. If the bolt is driven 

 parallel to the grain, the holding power is reduced almost exactly 

 one-half. 



Holding Power of Spikes. The following table gives the 

 results of experiments on the holding power of railway spikes in 

 ordinary wooden sleepers : 



Wire-rope Fastenings. 1 Experiments made by Mr. W. Hewitt, 

 on the strength of different forms of wire-rope fastenings, gave 



the following results : 



1 Pro. A merican Society of Mechanical Engineers. 

 vol. xlvi. p. 52. 



Extract from Engine* ring. 



