THE RISE AND PROGRESS OF PHOTOGRAPHY. 163 
looker-on this may seem of little service, but scientifie men know 
better, and are daily adding to their store of knowledge that of 
photography. 
One of the most remarkable things yet recorded is the photo- 
hoceesiva articulated speech. The possibility of mee is ansarted 
by Professor Blake, of Brown University. Dr. Klein, of Frank- 
fort, and M. Konig, of Paris, have both shown rsemsd or curves 
sccencaidong to certain noises ; but this is the first time that a 
word or sentence uttered by the human voice has been recorded 
by the camera obscura. Professor Blake employed the mouth- 
piece of the telephone, and _~ to the vibrating plate a piece of 
steel wire, upon which a mirror is set. The mirror and vibrating 
plate being i in perfect communication, all movements of the mouth- 
piece are imparted to the mirror. A bright ray or pencil of light 
is sent by a heliostat upon the mirror, tick reflects it again, and 
it passes ra the camera, where it is received upon a movable 
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camera dances up and down upon the moving is aoe a 
impresses upon the latter a series of curves ; the rate te at which 
the sensitive plate travels varies from six xteen to forty inches per 
second. These sounds are so marked and different that. the study 
of them would no doubt teach us something more than we know 
at present of articulate speec 
Nor is Art behindhand in Snakieg use of photography—it has 
been the means of vulgarizing those beautiful studies of the great 
masters that for so long a time had been the property of the few. 
y its means we can all be possessors of copies of the works of 
such men as Albert Durer, Martin Schéen Leyden, &c., and how 
largely = it — applied os ees illustration, and ith what 
trations—such een: pom wh en we have seen 
collection of photographs of the races that once peopled this 
country! ’Ti 
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