Portable double-needle telegraph and test set, 1850

Made:
1850 in United Kingdom
maker:
Unknown
Portable twin needle telegraph terminal. General three quarter view. Grey background Portable twin needle telegraph terminal. General three quarter view. Grey background Portable twin needle telegraph terminal. Detail view of face. Portable twin needle telegraph terminal. Detail view of terminals on back of unit.

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Portable twin needle telegraph terminal. General three quarter view. Grey background
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Portable twin needle telegraph terminal. General three quarter view. Grey background
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Portable twin needle telegraph terminal. Detail view of face.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Portable twin needle telegraph terminal. Detail view of terminals on back of unit.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Portable double-needle telegraph and test set, with removable wooden cover, unknown maker, possibly British, 1850.

This small instrument is both a telegraph instrument and a test set. It was compact enough to be carried by the telegraph lineman when inspecting and repairing telegraph wires. It worked using two pairs of press-buttons at the back of the case. When the instrument was required to work as a galvanometer (an instrument for detecting electric currents), a lever inside the case withdraws the needle stops, allowing the needles to swing fully across the dials. With the ivory stops in position the needles were used to send and receive messages using the standard double-needle code.

Details

Category:
Telecommunications
Object Number:
2004-123
Materials:
glass, metal (unknown) and wood (unidentified)
type:
telegraph and electric
taxonomy:
  • component - object
credit:
Donated by BT Heritage and Archives