GENEKAL OBSEEVATIONS 63 



Fig. 05. 

 I. Electric Bell with Dry Element. 



a, Under part, with box, for the dry element ; h. roller for winding np the 

 conductiut; -wires ; c, dry element, with screw-clamp for attachment of 

 the conducting-wires ; c', conducting- wire leading to the screw-clanip, 

 with contact-spring in c , Fig. 2, or to the wall in Fig. 3 ; d, upper part, 

 witli bell ; r/', conducting-wire to the shoe J' in Figs. 2 and 3 ; c, strap 

 for slinging the apparatus around the body of the assistant or rider ; 

 /, connecting- wire between bell and dry element. 



II. Hoof Shod with Shoe provided with Toe-piece and Calkins ; 

 Wall of the Hoof covered with Tinfoil. 



a, Heel angle, with 6, the contact-screws ; c, screw-clanip, with contact- 

 spring (isolated from the shoe) ; c' conducting-wire from the same ; 

 (/, screw-clamp, with conducting-wire {d') screwed into the edge of the 

 shoe ; c, nails, isolated by cutting a small window in the tinfoil. 



III. Hoof Shod with Plain Shoe ; Horny Wall covered with 

 Tinfoil. 



a. Toe and heel angle, with b, the contact-screws ; c, couducting-wire 

 passing from the tinfoil on the wall ; d, conducting-wire passing from 

 the shoe ; c', d', ends of the conducting-wires, which must be imagined 

 connected with the ends c', (/', passing from the ap})aratus. 



unconsciously, two separate observers were simultaneously 

 arriving by almost identical means at an equally satis- 

 factory answer to the question. Prior to the publication of 



