Pacinotti's Inductor.
The Pacinotti or Gramme Ring. (See Pacinotti's Ring.)
Pacinotti's Ring.
A ring of iron wire wound with coils of insulated wire at right angles
to its circular axis, and used as the armature of a dynamo or motor. A
number of connections are taken from the coils to a central commutator.
Fig. 254. PACINOTTI'S MACHINE, WITH RING ARMATURE.
If such a ring with its coils is rotated in a field, current can be
taken from points of the commutator on a line at right angles to the
lines of force entering the ring.
The ring was discovered in 1862 by Pacinotti, and later was
independently discovered by Gramme. It is often known as the Gramme
ring.
Pacinotti Teeth.
Projections on a cylindrical or drum armature, between which in the
grooves formed thereby, the wire is wound. The teeth being of iron tend
to diminish the reluctance or magnetic resistance of the interpolar
space, or interval between the poles of the field magnet.
Synonym--Pacinotti Projections.
Paillard Alloys.
Non-magnetic palladium alloys, invented by Paillard, of
Switzerland, used in anti-magnetic watches. The following are given as
the compositions of several such alloys:
I. II.
Palladium, 60 to 75 parts 50 to 75 parts
Copper, I5 to 25 " 20 to 30 "
Iron. 1 to 5 " 5 to 20 "