456

Class 10.—PHILOSOPHICAL, MUSICAL, HOBOLOGICAL,North, North Central, and South Central Galleries.

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construction, and which might lead to future improve-ments. The perfection to which electric telegraphs havesince arrived, their superiority over all other methods forconveying intelligence between distant places, and their

inconceivable importance and utility, are now well knownand established, and are justly considered one of th ewonders of the age. The following cut represents thisearly telegraph:—

Alexander’s Electric Telegraph.

A is a voltaic battery; B, a trough filled with mer-cury ; C, a wire connecting the zinc plate in the batterywith the trough of mercury; D, the return wire con-nected with the copper plate of the battery; E, a key tobe pressed down by the finger of the operator, like thekey of a pianoforte; F, is a pendant wire which dips intothe mercury when the key is depressed, and completesthe circuit formed by the wires, C and D, extending fromone terminus of the telegraph to the other.

G is the distant dial upon which the whole letters ofthe alphabet and stops are marked. These are not seenwhen the magnetic needles—poised horizontally in freespace behind the dial—are in their natural position ofNorth and South, with screens or veils marked V.,attached to each of their North poles, and concealing the

letters, but when the circuit is completed by the depress)of the key E, the corresponding magnetic ne , e . terdeflected to the West, and exposes, as at K, the lepreviously concealed. Thirty copper wires and a retwire extend from the keys to the magnetic needles.

A metallic rod may be advantageously substitutedthe trough of mercury below the keys.

427 Reid, Wm., 25 University Street, Bedford Sjua> e ~^Inventor, Patentee, and Manufacturer.

Pair of electric-telegraph instruments, adapted ®hotels, &c.; the same adapted for public companies, *domestic telegraph, adapted for dressing-rooms, & c -the following cuts:—

REIDS PATENT

PEIDS PATENT

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Reid’s Electric Telegraph.

An electrical apparatus for ringing bells in large man-sions, brought into instantaneous action by pulling a

cord or lever ; and capable of performing at ^“jJ'^ls.of 50 miles, with as much ease and rapidity as at i