F.. A. P. Barnard on the Pendulum, 187 
sufficiently novel in a clock in which the pendulum does abso- 
utely no work at all (not even in making battery connections), 
to deserve attention. There have probably been as many varie- 
ties of electric clocks as of escapement clocks—conceived, at 
least, if not constructed. All of these known to the writer, in- 
volve as much friction as the dead-beat escapement—most of 
them a great deal more—or else are otherwise objectionable. 
That which seems to be least so, is a contrivance described in 
the third volume of Becquerel’s Electricity, and attributed to 
Mr, Vérité, in which two light balls are suspended by metallic 
threads to a horizontal lever oscillating on pivots placed just 
above the point of suspension of the pendulum. Two arms from 
Wath two hooks (as shown in perspective at the bottom of the — 
hooks, to prevent liability to displacement. _ 
pendulum-rod is furnished with two semicireular arms, to 
eir extremities, are attached two parallel plates of 
h 
metal which pass between the hooks of the remontoir lever, and 
esp the weights, at the proper moments from the hooks, 
8 also slightly notched. or indented, to secure uniformity in 
They are also provided with adjustable weights at their extremi- 
