122 



HORSESHOEING. 



8. Hollow wedge-calks of Arnstein & Martin, Berlin S., Stall- 

 schreiberstrasse, No. 60 (Fig. 115.) 



9. Perforated screw-calks of A. Lungwitz, of Dresden (Fig. 

 116). 



10. Springing calks of Sickert, of Dresden ; and many more. 



Fig. 113. 



Fig. 114. 



Fig. 115. 



Fig. 116. 



Comer calk (Winkel- 

 stoUen) of Branscheid 

 & Philippi. 



Star calk of Gotz 

 &Co. 



Hollow calk of Arn- 

 stein & Martin. 



Perforated calk of 

 A. Lungwitz. 



There is no doubt that the grip that these calks take upon the 

 ground and their durability depend upon the diameter and 

 the arrangement of their surfaces of friction. From all experi- 

 ments made thus far it is shown that those calks which have 



Fig. 117. 



Universal screw-calk key. 



narrow and comparatively few surfaces of friction are the least 

 durable. 



To introduce and remove the calks we use a calk key or 

 wrench. For the shop, the ordinary fork key (Fig. 117), the jaws 

 of which are tempered, is recommended. It fits all calks. 



