52 



W. H. WARREN, 



special form of vertical Buckton testing machine, carry 

 the knife edges upon which the concrete beam rests. 



Fig. 1. 



r.- 



■A 





r^ — i 



«i 



Ar-ran&emenl- of Apparatus 



Nos. 1-8, Martens' Mirrors. Nos. 9 - 12, Sectors. Nos. 13, 14, Dials. 



Fig. 2. 



