GENERAL OBSERVATIONS 63 
fice 
Fie. 35. 
I. Evecrric Bett with Dry ELement. 
u, Under part, with box, for the dry element; b, roller for winding up the 
conducting-wires ; 36, dry element, with screw- clamp for attachment of 
the condueting- wires ; e, conducting-wire leading to the screw-clamp, 
with contact-spring in c’, Fig. 2, or to the wall in Fig. 3; d, upper part, 
with bell; d’, condueting- «wite to the shoe d’ in Figs. 2 and 3; ; e, strap 
for slinging the apparatus around the body of the assistant or rider ; 
J, connecting- wire between bell and dry element. 
II. Hoor SHop witH SHOE PROVIDED WITH TOE-PIECE AND CALKINS; 
WALL oF THE HOOF COVERED WITH TINFOIL. 
a, Heel angle, with b, the contact-screws ; e, serew-clamp, with contact- 
spring (isolated from the shoe); ¢’ conducting-wire from the same ; 
d, serew-clamp, with conducting-wire (d') screwed into the edge of the 
shoe ; ; é, nails, isolated by cutting a small window in the tinfoil. 
III. Hoor Sxuop witH Puiain SHor; Horny WALL COVERED WITH 
TINFOIL. 
a, Toe and heel angle, with }, the contact-screws; c, conducting-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 ce’, d', passing from the apparatus. 
unconsersusly, two separate observers were simultaneously 
arriving by almost identical means at an equally satis- 
factory answer to the question. Prior to the publication of 
