316 SEC. 10. ELECTRICITY. 



1585. Colour-writer (Morse), North German pattern. 



L. E. Schwerd, Carlsruhe. 



This is furnished with contact-arrangement for translation, and with 

 commutator for sending the current through both electro-magnent coils either 

 successively or simultaneously ; in the latter case the resistance of the coils 

 should be only . 



1586. Box Relay, N. German pattern. 



L. E. Schwerd, Carlsruhe. 



1587. Key, N. German pattern. L. E. Schwerd, Carlsruhe. 



1588. Colour- writer (Morse), S. German pattern. 



L. E. Schwerd, Carlsruhe. 



This apparatus (much used in Baden and Bavaria) is adapted for either 

 constant or working current. 



1589. Pendulum Relay, S. German pattern. 



L. E. Schwerd, Carlsruhe. 



1590. Galvanometer, S. German pattern. 



L. E. Schwerd, Carlsruhe. 



The deflections of the needle correspond closely between 15 and 35 to 

 the strength of current. The instrument is sensitive and easily portable. 



1591. Key, S. German pattern. L. E. Schwerd, Carlsruhe. 



1591a. Andrew's Guillotine Relay. W. Andrews, Esq. 



The armature is a permanent horseshoe magnet, placed horizontally, and 

 playing between two electro-magnets, the one above the other below the 

 armature. 



The upper electro-magnet is of the ordinaiy form, the lower one has the 

 cross-piece removed and the poles of a horseshoe permanent magnet con- 

 nected to its cores instead. The current passes through both coils, which 

 are so connected that the electro-magnets act oppositely upon the permanent 

 horseshoe armature, one attracting while the other repels. 



The upper electro-magnet is movable in a vertical direction, and can be 

 shifted up and down by an adjusting screw. This forms the chief adjustment, 

 but a spiral spring is also provided for the purpose. 



1607. The Uno-electric File with Galvanometer. 



Landsberg $ Wolpers (Hanover). 



TELEGRAPHIC APPARATUS CONTRIBUTED BY THE IMPERIAL 

 GERMAN TELEGRAPH DEPARTMENT. 



1608. Copy of the Electro-chemical Telegraphic Appa- 

 ratus of S. T. Sommering, the first German telegraphic appa- 

 ratus, constructed in 1809. 



1609. Drawing of the Russian Councillor Schilling's 



(of Kannstadt) Apparatus, being the first needle telegraph (two 

 sheete). 



