707
Mahogany baseboard and platform with pillars. The solenoid primary
circuit is attached to a battery. The interrupter at the top is turned by a
crank, so inducing a high frequency current in the secondary coils. This
current is to be taken off to a pair of brass hand grips. Part of the very
large 1843 purchase, see 691. Hackmann (1989), “The Induction Coil
in Medicine and Physics 1835-1877”.
708 ELECTRO-MEDICAL INDUCTION COIL (696) 1855
Signed: RUHMKORFF Mécanicien, 15 Rue des Maçons
Sorbonne, Paris.
Case 262 x 116 x 37
Mahogany case with internal tray lined with red chamois leather.
Two coils are covered by silvered metal protectors which pull out
through a hole in the back of the case; brass scale between them, marked
0-7 by halves to indicate power of charge. Two zinc cells to left of coils.
Two silvered cylinders attached to black-painted handles for patient to
hold, attached to insulated, green-covered wires; also pads to be used
with cylinders. Accessories include: contact with brass wire brush; bent
contact, rubber covered; glass botde containing mercury bisulphate
crystals; small glass measure. On front of casé, interrupter knob, and
contact breaker. In bottom of case instruction sheet in French. Inset on
top of lid is an ivory signature panel. In May 1855 was purchased for
Dfl. 68.40 from W.M. Logeman, Haarlem: “een Ruhmkorff inductie
apparaat”. Deschanel (187§||, 778, fig. 562; Guillemin (1891), 926-
927, fig. 566.
j i ' v :i< B
1/ /: r . l B—W i
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|.l¡tris. '
708 708
709 ELECTRO-MEDICAL COIL (697) 1855
Signed: W. LADD 11 & 12 BEAK STREET, REGENT ,
STREET W.
Box 365 x 180 x 140 high
The mahogany box is on bun feet and has a glazed top to show the magnet.
There is a leather strap attached to the sides for carrying. The
horseshoe magnet is composed of seven laminations. In front of the
poles are two bobbins (electromagnetic coils). Two leads covered with
green cotton attach to contacts with wooden handles. Physiological use
requires high voltages, therefore the wire in the coils must be fine and
very long. It was believed that this sort of electrification could releave
nervous disorders. Purchased through W.M. Logeman in October 1855
for Dfl. 146.70. For an explanation, see Deschanel (1877), 777^w8]
Negretti & Zambra||880], 415-419; Guillemin (1891), 402.
710 ELECTRO-MEDICAL CHAINS (573) 186.6
Unsigned; by O. Hempel, Paris
Box M0 x 128 x 60
Brass plaque on lid: CHAINES HYDROELECTRIQUES MEDICA-
LES PULVERMACHER BREVETES S.G.D.G. J.L. Pulvermacher
INVr & Fc fJ^'ICHAINlS HYDRO-ELECrPWUso reference to
Exposition of 1855:
Wooden case, covered with black leather on top and black cloth on
sides, holds two chains. Each chain is 1,350 in length, and 32 in width,
and is folded between protective leaves of pitch-covered paper. Each