150 
A. ZONDEL. 
is dt rest, <is wlicn lie is at work it soon becomes loosened \ 
besides which it is difficult to make properly. 
Holland lias contrived an articulated shoe, in three pieces, the 
two latcial pieces being kept apart by double steel springs, which 
press upon them from the toe on their internal border, and thus 
effect the desired dilatation. Hatin has a simpler shoe (fig. 17). 
It is a light shoe, with nail-holes distant from the heels, and pro¬ 
vided on the internal border with a small clip upon which rests a 
V spring, fixed by its point upon the toe of the shoe. The 
branches of the spring lodge in the hollows of the sole and of the 
frog, and press upon the shoe, and thus produce a slow dilatation. 
Steinhoff has also invented a shoe with springs. It has recently 
