ELECTRO-MOTIVE POWER. 



incomprehensible, is his microscopic writing, which has been 

 already noticed in our Tract on Microscopic Drawing and 



Fig. 7. Fromcnt's Writing Telegraph. 



Engraving. We will here reproduce from that article a specimen 

 of this miraculous performance. Fig. 8, written in the Crystal 

 Palace, in 1851, within a circular space, having the diameter 

 of the 30th of an inch. 



The details of the method by which this microscopic writing is 

 executed have not yet been made public, but we believe the 

 inventor is preparing a memoir on the subject, to be presented to 

 the Academy of Sciences. 



15. This brief notice of the application of electro-motive power 

 must not be concluded without mentioning its remarkable appli - 

 cation to chronometers, examples of which may be seen in many 

 parts of this country, one of which is presented daily and nightly 

 in the Strand, near the Electric Telegraph Office. 



The general principle of this beautiful application of physical 

 science to the economy of life is easily explained, 



The hand of a clock or watch moves not uniformly, but by a 

 succession of starts, as may be plainly seen in the case of a 

 seconds' hand of a watch or clock. The same intermitting motion 

 affects the minute and hour hands, but their movement from 

 second to second is so minute that it is imperceptible to the eye. 



Now, from what has been already explained, it will be evident 

 that a similar intermitting motion can be imparted to the contact 

 piece of an electro-magnet by the alternate transmission and 

 suspension of the current. If, therefore, by any means the electric 



