IOO 



PHOTO-TELEGRAPHY 



seen from the quality of the pictures telegraphed 

 with this instrument since published in the Daily 

 Mirror . 



It has already been explained that a graduation 

 of tone in a photograph is 

 represented in a line half- 

 tone photograph by lines 

 becoming gradually nar- 

 rower. This tapering down 

 of the width of the lines in 

 the telegraphed picture re- 

 ceived is wonderfully repro- 

 duced, and the results are 

 therefore truly "photo- 

 graphic " ; indeed, examined 

 a short distance away, they 

 are, if the synchronisation 

 has been good, hardly distin- 

 guishable from the original 

 photographs. 



In October, 1909, a telec- 

 trograph was installed in 

 Paris, but here again trouble 

 was at first experienced. In the first place, the line is 

 half as long again as the London-Manchester line, and 

 in the second, its various elements are distinctly dif- 

 ferent. The first picture received was successful, but 

 then the line conditions must have changed, because 

 for several days the results were extremely bad, each 



FIG. 46. Portrait of Mr. 

 Howarth, telegraphed 

 from Manchester to 

 London by the Thome- 

 Baker Telectrograph. 



