197 
November 28, 1870. 
The Prestpent (PROFESSOR CAYLEY) in the Chair. 
Communications to the Society : 
(1) Ona model of an electro-motive machine. 
(2) On a model for transferring rotatory motion to a 
distance by means of a single wire. 
(3) On a method of describing ellipses and (4) of draw- 
img in perspective. 
(5) On a steam-ship for conveying trains from Dover to 
Calais. By J. C. W. Exits, M.A. Sidney. 
The following are abstracts of Mr Ellis’s explanations : 
i. Electro-motive machine. 
Consisting of three springs acted upon by electro-magnets 
successively. The springs, or elastic levers, are easily bent by 
the at first feeble magnetic influence, and as they approach the 
magnets resist with greater force but are overcome by the in- 
creased power of the magnets, and so the effect of the magnets 
is equalized and prolonged. 
ii. Rotation conveyed to a distance by means of a single wire. 
The original motion may be either one of rotation or a recti- 
linear backwards and forwards motion. Upright posts revolving 
about hinges at the foot carry the wire, which may be very fine 
and light by using leverage. The wire may be turned through 
any angle by applying a stay-wire to the post. The wire is 
finally applied to a wheel carrying a rachet, which drives a 
heavy fly-wheel. The rachet-wheel is drawn back by a spring. 
The advantage of this method consists simply in the ease with 
which it may be put up, its cheapness, and from its requiring 
no alteration or oiling. It is suitable for conveying power from 
a water-wheel to a farm for churning, gorse and chaff cutting, 
&e. 
