368 SEC. 10. ELECTRICITY. 



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 Belay, 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. 



159 la. Andrew's Guillotine Belay. W. Andrews. 



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 ordinary 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. 



1591b. Morse Ink Writer, with Relay for translating 

 connexions. Warden, Muirhead, and Clark. 



16O7. Uno- electric File with Galvanometer. 



Landsberg 3? Wolpers (Hanover). 



1635a. " Edison's Electric Pen," and " Autographic 

 Press." Thos. D. Clare. 



This pen consists of a small electro-magnetic engine on the top of a holder, 

 which is used as a pen, and works a needle which pierces the paper, making 

 5,000 to 6,000 fine holes per minute, so that in writing such is the rapidity of 

 the motion of the needle that the point does not drag or tear the paper. 



The pierced paper or " stencil " is placed in a frame, and an inked roller is 

 passed over, which fills the fine perforations with ink. A sheet of paper 

 is then placed below the written paper or stencil, and the roller is again passed 

 over once or twice, when a perfect fac-simile is obtained. 



These fac-similes can be produced at the rate of four to six per minute, arid 

 one writing or stencil will suffice to print 1,000 copies. 



1657. Original Five-Needle Telegraph Dial. 



The Council of King's College, London. 



1658. Two-Needle Telegraph. 



The Council of King's College, London. 



