An Unusual Induction Coil,

An Unusual Induction Coil, English, c.1900, engraved on the coil, 'P HARRIS & Co. Ld. BIRMINGHAM', the coil mounted on a French polished mahogany plinth base with all lacquered brass fittings and term

Very Large Induction Coil by Max Kohl, c. 1915 Max Kohl, Chemnitz, Germany. Coil length 12 ¼ in., length of the spark gap approx. 6 in., with mercury and platinum interrupters and Ruhmkorff's commuta

English Laboratory Induction Coil, c. 1900 James Morris, Bolton. Coil length 12 in., length of the spark gap approx. 4 in., with Ruhmkorff's commutator, on polished mahogany base, size 21 x 11 in. - T

Large Induction Coil According to Ruhmkorff, c. 1910 Manufactured by AEG, Berlin. For spark length up to 10 in., overall size 34 x 10 5/8 x 18 ¼ in., good original condition. Großer Funkeninduktor n

Large Induction Coil with Mercury Interrupter, c. 1910 Coil length 19 5/8 in., spark length up to 9 7/8 in., on wood base, size 32 1/3 x 14 1/5 in. An impressive exhibition item! Großer Funkenindukto

3 Induction Coils and 5 Leyden Jars 1) 10 ½ in. induction coil by Griffin & George, Great Britain. With commutator and spark gap, on mahogany base, 18 x 11 in. - 2) 6-inch induction coil, unmarked, w

Large 16-Inch Induction Coil According to Ruhmkorff, c. 1910 No. 997, manufacturer: "Watson & Sons (Electro-Medical) Ltd.", London, for spark lengths up to 16 in., overall size 34 x 13 1/3 x 18 ¼ in.

Large Induction Coil According to Ruhmkorff, c. 1910 Manufactured by Siemens & Halske. For spark length up to 6 in., with commutator, length of the coil 15 2/5 in., overall size 30 x 10 5/8 x 16 ½ in

Large Induction Coil According to Ruhmkorff, c. 1900 No. 7934, manufactured by Fr. Klingelfuss & Co., Basel. Coil length 16 ½ in., Ø 8 ¾ in., on walnut base. Großer Funkeninduktor nach Ruhmkorff,

'Large Induction Coil by Siemens & Halske, c. 1910 For "Gesellschaft für drahtlose Telegraphie", type RF ms2, 17 ¾ x 9 7/8 x 11 2/5 in. 'Großer Funkeninduktor von Siemens & Halske, um 1910 Für "Ge

English, c.1900, unsigned the secondary coil with vulcanite separator and supported on wooden uprights, on large French polished mahogany base with brass lacquered terminals, tall upright insulators t

A Very Large Induction Coil, English, c.1900, unsigned the secondary coil with vulcanite separator and supported on wooden uprights, on large French polished mahogany base with brass lacquered termina

Large "Nivoc" Laboratory Induction Coil, c. 1930 W. and J. George and Becker Limited, Birmingham and London. Coil length 13 in., length of the spark gap approx. 5 in., with Ruhmkorff's commutator, on

A Large Induction Coil, English, c.1890, with plaque for 'F. E. BECKER & CO 33-37 HATTON WALL LONDON', on a large French polished mahogany plinth base with Ruhmkorff switch large adjustable interrupte

Cast Iron Kettle with Gate Mark & Unusual Coil Spring. Cast iron tea kettle with attached tiler and handle. This piece has a gate mark on the bottom and the small lid has a gate mark on top of it

Laboratory Induction Coil, English, c.1950, with lable for Griffin & George, on plinth base with spark gap to front, width 32cm

Norwegian Wall-Mount Switchboard, c. 1890 By Wingers Elektriske Værksted. Walnut case, 15 lines, 3-part induction coil, 6 plugs with weights (wiring renewed), handset with speaking horn, lightnin

French Experiment Box for Demonstrating Electricity, c. 1910 Electricité, with 2 chromic acid cell batteries, induction coil, 2 Geissler tubes, magneto-electro motor with mount for tubes, 2 lamps

Telephone Switchboard, c. 1910 With plugs and flaps, five-part induction coil, crank, handset with speaking horn, and mahogany case, height 22 ½ in. Telephonzentrale, um 1910 Mit Stöpseln und Kl

Nikola Tesla (July 10, 1856 – January 7, 1943) signed typewritten letter cut. After emigrating to the U.S. in 1884, Tesla invented the induction coil or Tesla Coil a device essential to sending

Early Wall Telephone by L.M. Ericsson, c. 1890 Stockholm, model 325, fixed carbon microphone, Bell-type handset, 3-part induction coil, double bell, lightning protection, ornate walnut case, writing d

Early Wall Telephone by L.M. Ericsson, c. 1890 Stockholm, model 301 (new no. AB 210), fixed carbon microphone no. 570 on arm, Bell-type handset, 3-part induction coil, double bell, lightning protectio

German Wall Telephone Model M1903 Manufacturer "P.Z. & Co.", no. 1143, moveable mouthpiece, Siemens & Halske receiver, 3-part induction coil, wood case. Deutsches Wandtelephon Modell M1903 Herstell

12 Precision Measuring Instruments, c. 1870-1900 1) Kohlrausch's universal bridge, no. 1822, Hartmann & Braun, with comparative resistors from 0.1 to 1000 ohms, induction coil and slide resistor, on m