286 



ELECTRIC LIGHTING. 



artists have succeeded in so truly reproducing the features and 

 details of grottoes and dark caverns, that only by the shadows 

 cast was it possible to distinguish them from places illumi- 

 nated by daylight. Several photographers have desired to 



FIG. 72. 



use this means for copying and printing, and Pierre Petit and 

 Liebert have even lately fitted up a complete electrical 

 arrangement for taking portraits in this way. We read in 

 the Scientific Correspondence of the i4th January, 1879, the 

 following news : 



