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Experimental carbon pencil microphone, 1878-1890

Experimental carbon pencil microphone, 1878-1890

1878-1890
Hughes microphone detector, 1865-1875

Hughes microphone detector, 1865-1875

1865-1875
Experimental microphone, 1878-1890

Experimental microphone, 1878-1890

1878-1890
Experimental carbon block microphone, 1878-1890

Experimental carbon block microphone, 1878-1890

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

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

1878-1890
Powdered graphite microphone, 1878-1890

Powdered graphite microphone, 1878-1890

1878-1890
Powdered graphite microphone, 1878-1890

Powdered graphite microphone, 1878-1890

1878-1890
Granular microphone in bamboo tube, 1878-1890

Granular microphone in bamboo tube, 1878-1890

1878-1890
Experimental microphones with carbon pencils and cups, 1878-1890

Experimental microphones with carbon pencils and cups, 1878-1890

1878-1890
Granular microphone in glass tube, 1878-1890

Granular microphone in glass tube, 1878-1890

1878-1890
Powdered graphite microphone, 1878-1890

Powdered graphite microphone, 1878-1890

1878-1890
Cell used in interruptor circuit, 1875-1890

Cell used in interruptor circuit, 1875-1890

1875-1890
Hughes' printing telegraph, 1860.

Hughes' printing telegraph, 1860.

1860
Hughes' printing telegraph, 1860.

Hughes' printing telegraph, 1860.

1860
Three-nail microphone, 1875-1880

Three-nail microphone, 1875-1880

1875-1880
Experimental microphones using steel needles and gas carbon, 1878-1890

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

1878-1890
Home-made Bell telephone receivers, 1875-1890

Home-made Bell telephone receivers, 1875-1890

1875-1890
Experimental wood-charcoal microphones, 1878-1890

Experimental wood-charcoal microphones, 1878-1890

1878-1890
Experimental microphone, 1878-1890

Experimental microphone, 1878-1890

1878-1890
Fragments of a Three-nail microphone, 1875-1880

Fragments of a Three-nail microphone, 1875-1880

1875-1880
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
French-nail microphone used by D.E. Hughes together with one small gauze-covered box, probably made by David Edward Hughes, England, 1875-1880

Three-nail microphone, 1875-1880

1875-1880
One of a pair of home made Bell telephone receivers, probably made by David Edward Hughes, England, 1875-1890.

one of a pair of home made Bell telephone receivers, 1875-1890

1875-1890
One of a pair of home made Bell telephone receivers, probably made by David Edward Hughes, England, 1875-1890.

one of a pair of home made Bell telephone receivers, 1875-1890

1875-1890
Granular microphone in glass tube, probably made by David Edward Hughes, England, 1878-1890

granular microphone in glass tube, 1878-1890

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

granular microphone in glass tube, 1878-1890

1878-1890
One experimental microphone consisting of steel needles suspended in contact with blocks of gas carbon, probably made by David Edward Hughes, England, 1878-1890

experimental steel needle and gas carbon microphone, 1878-1890

1878-1890
Experimental microphone consisting of carbon pencil in carbon cups, probably made by David Edward Hughes, England, 1878-1890

Experimental carbon pencil microphone, 1878-1890

1878-1890
Spare weight for Hughes typewriting telegraph instrument, unknown maker, 1860. Invented about 1855 by David E Hughes (1829/31-1900), US patent numbers, 14,917, 1856; 22,531, 1859 and 22,770, 1859; British patent number 938, 1858.

Spare weight for Hughes' printing telegraph, 1860.

1860