xiii
1824. Scweigger invents the multiplier coil.
1830. April.—Is the first clear date given by Dr. Hamel
in connexion with Baron Schilling’s needle telegraph, when it was shown to the Emperor Nicholas, “who (he adds) had been pleased to notice it in its earlier stage.”—(P. 41.) But at p. 66, the Doctor speaks vaguely of “above a dozen years previous” to 1837 as the date of
Schilling’s invention.In 1830, Baron Schilling had known for twenty years the details of Soemmering’s telegraph; and for, at least, 15 years, the deflective power of the galvanic current on the magnetic needle.
1835. Schilling shows his telegraph at Bonn, simplified
to a single needle and multiplier.—(P. 43.
1835. Muncke exhibits at Heidelberg a model of
Schilling’s telegraph.—(P. 43.)
1836. March.—Cooke sees Muncke’s model of
Schilling’s one needle telegraph.—(P. 49.)
1836. March.—Cooke makes two instruments (p. 53)
shown in the Drawing, Part B., Vol. II., of Cooke’s work, at the end, where they are
compared with Muncke’s models.