Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . ent is caused to press astrip upward against the type-wheel, urhich impriuts the letters. The chariot and type-shaft are readily adjusted to correspond-ence, if required, previous to the transuussion of a message,and any slight inee-wheel shaft is actuated by a pawlattached to an annature. Fig. I c. The type-wbeel is mounted directly upon the&haft of an e
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . ent is caused to press astrip upward against the type-wheel, urhich impriuts the letters. The chariot and type-shaft are readily adjusted to correspond-ence, if required, previous to the transuussion of a message,and any slight inee-wheel shaft is actuated by a pawlattached to an annature. Fig. I c. The type-wbeel is mounted directly upon the&haft of an electric motor, the annalure-wheel ofwhich revolves between the poles of two electro-magnets. a. Phelpss printing-telegraph, November 4, 1873(Fig. 3956). The type-wheel /, driven by clock-work mechanism firom the=pring-barrel, is placed on a shaft concentric with the ratchetA-. which L* controlled by paUets of the escapement / / attachedto the permanently magnetised armature m vibrated bv alter-nating currents through the electro-magnets op. The electro-magnet r, controlling the printing escapement, is in the samecireuit, its core having an extension ir. and^ being surroundedby a non-ma^etic material, it is not operated bv the rapidlychanging currents passing through op, which work the tvpe-wheel escapement: but when the key connected with auv par-tk-iilar letter is struck, the circuit* is cla*ed, sufficientmag-netL«m accumulates in the core ir to attract the armature r,releasing the arm y carrying the paper-roUer s. and
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