Next year
a second cable was laid from the Capital to Cologne, Aix-la-Chapelle,
and Verviers.
In 1847 the, subject of our memoir had, along with Mr. Halske, founded a
telegraph factory, and he now left the army to give himself up to
scientific work and the development of his business. This factory
prospered well, and is still the chief continental works of the kind.
The new departure made by Werner Siemens was fortunate for electrical
science; and from then till now a number of remarkable inventions have
proceeded from his laboratory.
The following are the more notable advances made:--In October 1845, a
machine for the measurement of small intervals of time, and the speed of
electricity by means of electric sparks, and its application in 1875 for
measuring the speed of the electric current in overland lines.
In January 1850, a paper on telegraph lines and apparatus, in which the
theory of the electro-static charge in insulated wires, as well as
methods and formula: for the localising of faults in underground wires
were first established. In 1851, the firm erected the first automatic
fire telegraphs in Berlin, and in the same year, Werner Siemens wrote a
treatise on the experience gained with the underground lines of the
Prussian telegraph system.
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