Search Results
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Passage of current between London and York
- 1870 – 1900
Diagram depicting the passage of current between the cities of London and York in a needle telegraph system. One of the two main types of electromagnetic telegraphs, needle telegraphs use indicating needles moved…
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Passage of current in needle telegraph system
- 1870 – 1900
Diagram depicting the passage of current in a needle telegraph system. One of the two main types of electromagnetic telegraphs, needle telegraphs use indicating needles moved electromagnetically as a means of displaying…
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Steinhael's [Steinheil's] Galvanic Telegraph
- 1853
Diagram depicting various components of the galvanic telegraph system designed by German physicist, inventor, and engineer Carl August von Steinheil (1801-1870).
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House printing telegraph system
- 1853
Text and two illustrations from page 118 of the 1853 volume The Electro Magnetic Telegraph detailing the printing telegraph system invented by Royal Earl House (1814-1895) in 1846. An example of a synchronous data…
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Morse telegraphic characters
- 1853
Text and accompanying table from page 73 of the 1853 volume The Electro Magnetic Telegraph detailing the Morse code alphabet and numerals used to communicate via telegraph.
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Diagram of electro-chemical telegraph
- 1853
Text and woodcut diagram from page 35 of the 1853 volume The Electro Magnetic Telegraph detailing the primary components of an electro-chemical telegraph, including the indicator (a) and communicator portions (b),…
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Brett's Electric Printing Telegraph
- 1853
Two illustrations depicting components of the electric printing telegraph system patented in 1845 by English telegraph engineer John Watkins Brett (1805-1863). Brett's design consists of a piano-style keyboard linked…
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Exterior view of Welsbach Gas Light Company facility
- 1920s
Photographic reproduction of an artist's rendering of the Welsbach Gas Light Company site located along the Delaware River in Gloucester City, New Jersey. From 1888 to 1940, the Welsbach Gas Light Company held…
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Phosphorescent Flower Emitting Light in a Dark Room
- 1870 – 1900
Illustration depicting a flower temporarily illuminated through the use of phosphorescent powder.
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Artificial Flower Coated with Phosphorescent Powder, Exposed to the Light of Magnesium Wire
- 1870 – 1900
Illustration depicting an experiment in which an artificial flower coated with phosphorescent powder temporarily becomes luminous and shines in the dark when exposed to magnesium wire.
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Experiment of Instantaneous Crystallization
- 1870 – 1900
Illustration depicting an experiment in the instantaneous formation of salt crystals.
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55 items
Welsbach Gas Light Company photograph album
- 1920s
Album containing 52 black and white photographs documenting various aspects of the production process at the Welsbach Gas Light Company site located along the Delaware River in Gloucester City, New Jersey. From 1888 to…
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Seltzer-water Manufactory
- 1870 – 1900
Illustration depicting the manufacture of seltzer or soda water by use of a wheel to force gas into bottled water.
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Snow Crystals
- 1870 – 1900
Illustration depicting a magnified view of an assortment of snowflakes, also known as snow crystals.
- Author Ward, Lock & Co.
- Subject Scientific illustration, Science--Study and teaching, Snowflakes, Ice crystals
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Dial Telegraph Manipulator
- 1870 – 1900
Illustration depicting the manipulator component of a dial telegraph. Devised by French watchmaker Louis-François Breguet, the dial telegraph used electric current to rotate the needle around the dial of a receiver,…
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Dial Telegraph Receiver
- 1870 – 1900
Illustration depicting the receiver component of a dial telegraph. Devised by French watchmaker Louis-François Breguet, the dial telegraph had both the appearance and working mechanism of a clock. When activated by an…
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Morse Alphabet and Numbers
- 1870 – 1900
Text and table detailing the Morse code alphabet and numerals used to communicate via telegraph.
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Handles and Needles of Telegraph
- 1870 – 1900
Illustration depicting the handles and needles used to operate a needle telegraph. One of the two main types of electromagnetic telegraphs, needle telegraphs use indicating needles moved electromagnetically as a means…
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Telegraph Wires and Insulator
- 1870 – 1900
Two illustrations depicting a general view of telegraph wires and a close-up view of the glass or porcelain insulator used to insulate the electrical wires.
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The Needle Telegraph
- 1870 – 1900
Illustration depicting a man using a needle telegraph. One of the two main types of electromagnetic telegraphs, needle telegraphs use indicating needles moved electromagnetically as a means of displaying messages.
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Medico-galvanic Battery
- 1870 – 1900
Diagram depicting a medico-galvanic battery, a type of portable shock-producing electrotherapeutic device commonly in use between 1870 and 1920. Such devices provided both direct and alternating current and were thought…
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Galvanometer
- 1870 – 1900
Illustration of a galvanometer, a device used to detect and measure small amounts of electrical current through the use of a magnetic needle or a coil in a magnetic field.
