The telegraph manual: a complete history and description of the semaphoric, electric and magnetic telegraphs of Europe, Asia, Africa, and America, ancient and modern.

THE PATENTED CLAIM. 401
mitted to advance; they must be at least twenty-five per
second to prevent the printing machine from acting; the
intervals of time the electric currents are allowed to flow unbroken are equal, and the number of magnetic pulsations
necessary to indicate a different succession of letters are
exceedingly unequal; from A to B will require one twentyeighth of a revolution of the type wheel, and one magnetic
pulsation; from A to A will require an entire revolution of the
type wheel and twenty-eight magnetic pulsations.
THE PATENTED CLAIM.
On the 28th December, 1852, Royal E. House obtained the
following patent for various improvements on the original
machine: " I claim, First. The employment of electromagnetic force, in combination with the force of a current of
air, or other fluid, so that the action of the former governs or
controls the action of the latter, for the purpose described.
Second. I claim the construction of the electro-magnet, as
described; that is to say, a series of fixed magnets, in combination with a series of moveable magnets, arranged upon a
central axis, which axis plays between or through the line of
fixed magnets, so as to effect a vibratory movement of said axis
by a force multiplied by the number of magnets of both kinds.
Third. I claim the combination of the electro-magnet with
the valve, for regulating and directing the force of a current of
air, or other fluid, acting as a motive power upon the piston,
or other analogous device for producing a vibratory motion, as
described. Fourth. I claim the endless band, in combination
with the cylinder, as an inking machine, for conveying and
applying the coloring matter to the paper, at the moment of
receiving the impression from the types, as described. Fifth.
I claim the combination of the regulating bar with the type
wheel, for the purpose of regulating the proper position said
wheel should have, in connection with a given position of the
key shaft, at the moment of printing any letters or characters."
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