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Experimental microphones with carbon pencils and cups, 1878-1890

1878-1890

Granular microphone in glass tube, 1878-1890

1878-1890

Carbon water filter

1890-1915

Powdered graphite microphone, 1878-1890

1878-1890

Experimental microphone using steel needles and gas carbon, 1878-1890

1878-1890

Granular microphone in bamboo tube, 1878-1890

1878-1890

Hughes microphone detector, 1865-1875

1865-1875

Five watt carbon resistor

Trimmed test piece of carbon

Cured blank of carbon

Leclanché cell, 1957

1957

"Proplast" implant material

1980

Experimental wood-charcoal microphones, 1878-1890

1878-1890

Experimental microphones using steel needles and gas carbon, 1878-1890

1878-1890

for use in restaurant cars only

4 test pieces of carbon

Leitz Microscope Lamp

1905-1915

Box of carbon electrodes for use with an arc lamp

1900-1910

Telephone operator's pencil

1950-1980

Cardiophone used to demonstrate auscultation

1889-1890

One box of Cura-Heat 12-hour pain relief for period pain

2010-2018

High frequency turret attenuator unit type A63

1957

Callendar Electrical Temperature Indicator, 1894

1894

Jablochkoff Candle on Stand, c. 1876

1876-1877

Carbon arc lamp

Bichromate battery - zine and carbon plates surpended from the woodenlid into a glass jar

1890-1900

Pen and case made with captured carbon

c. 2020

Very early Edison carbon filament lamp.

1879

Dolan Precursor Bicycle

2009

Experimental microphone in sound box, consisting of two small blocks of wood-charcoal pressed upon each other by a spring, probably made by David Hughes, England, 1878-1890

Experimental microphone in sound box, 1878-1890

1878-1890

Six bichromate cells of carbon and zinc contained in case with brass fittings, European, 1880-1920

Six bichromate cells of carbon and zinc contained in case with brass fittings

1880-1920

Electrotherapeutic machine in large wooden box, for both galvanic and induced current 18 cell battery, coil galvanometer, made by Malaquin and Poulignier, Paris, 48 Rue Monsieur-le-Prince, French, 1880-1890

Electrotherapeutic machine in large wooden box

1880-1890

Electromagnetic machine in walnut(?) box, containing battery, induction coil and 2 electrodes, made by Legendre, Paris, French, 1880-1890

Electromagnetic machine in walnut(?) box, containi

1880-1890

Original Fleming diode, 60 S16, (RMW/A1A - McVitie Weston number), by The Edison and Swan Electric Light Company Limited, c.1904, invented by Sir (John) Ambrose Fleming and used by Fleming in October 1904.

Fleming diode

1904

Four granular microphones, three in glass tubes, one in bamboo tube, probably made by David Edward Hughes, 1878-1890

four granular microphones, 1878-1890

1878-1890

Bichromate or Poggendorf cell; glass bottle with long narrow neck and brass collar. Into brass collar fits a stopper with two terminals and screw for locking central zinc plate at any height. Zinc plate is flanked on either side by carbon blocks, which in this case are made in two halves so they can be replaced.

Poggendorf or bichromate cell

Bottle of ‘Battersea Carbon Granules’, No. 24 used to re-fill and repair early carbon microphones.

Bottle of Carbon Granules

1925-1935

Pair of bichromate cells, - zinc and carbon plates suspended from wooden slot into glass jars, probably English, 1890-1900

Pair of bichromate cells

1890-1900

Granular microphone in glass tube, probably made by David Edward Hughes, England, 1878-1890

granular microphone in glass tube, 1878-1890

1878-1890

Granular microphone in glass tube, probably made by David Edward Hughes, England, 1878-1890

granular microphone in glass tube, 1878-1890

1878-1890

Pifco carbon arc lamp with original box and carbon rods. Made by Pifco, England, 1945 - 1955. Used for UV light treatments at home, made of carbon and metal

Pifco carbon arc lamp with original box and carbon rods

1945 - 1955

Four rectangular wooden boxes full of spare carbon rods for Dr. Riviere's lamps, Siemens and Co., maker, Lichtenburg, South African, 1890-1910

Four rectangular wooden boxes full of spare carbon rods for Dr. Riviere's lamps

1890-1910

One experimental microphone in sound box, consisting of two small blocks of wood-charcoal pressed upon each other by a spring, probably made by David Edward Hughes, England, 1878-1890

One experimental microphone in sound box, 1878-1890

1878-1890

Motorcycle gloves that belonged to Carl Fogarty, 1996.

Motorcycle gloves that belonged to Carl Fogarty

1996

Vibrating bar designed to supply current at 50Hz to time-marker used with electrocardiograph, by Cambridge Instrument Company Ltd., England, 1934

Vibrating bar designed to supply current at 50Hz to time-marker used with electrocardiograph

1934