angle has been determined, the angle, E C D, is rendered invariable by
means of a set screw, and the apparatus is maneuvered by imparting to
the double winch, H C I, an alternating circular motion.

The iron cylinder weighs 23 kilogrammes; but, when the current has an
intensity of 43 amperes and traverses 15 sections, the stress developed
may reach 70 kilogrammes; that is to say, three times the weight of the
hammer. So this latter obeys with absolute docility the motions of the
operator's hands, as those who were present at the lecture were enabled
to see.

I will incidentally add that this power hammer was placed on a circuit
derived from one that served likewise to supply three Hefner-Alteneck
machines (Siemens D{5} model) and a Gramme machine (Breguet model P.L.).
Each of these machines was making 1,500 revolutions per minute and
developing 25 kilogrammeters per second, measured by means of a
Carpentier brake. All these apparatus were operating with absolute
independence, and had for generator the double excitation machine that
figured at the Exhibition of Electricity.

In an experiment made since then, I have succeeded in developing in each
of these four machines 50 kilogrammeters per second, whatever was the
number of those that were running; and I found it possible to add the
hammer on a derived circuit without notably affecting the operation of
the receivers.

It results from this that with my system of double excitation machine I
have been enabled to easily run with absolute independence six machines,
each giving a two-third horse-power. The economic performance, e/E,
moreover, slightly exceeded 0.50.