triere. We shall describe further along the annex of velocity. Here again is one of the characteristics of mon return wire. the laboratory of photography that has been created The apparatus is mounted upon a laboratory stand our apparatus, for it permits, independently of the to utilize it.… … more seconds. There is no- modification, it has been able Fig. l.-FACSIMILE OF A PHOTOGRAPH TAKEN BY MR. LONDE'S PHOTOCHRONOGRAPHIC METHOD. thing even to prevent operat- to serve us for giving emis- ing at more distant intervals, sions of current at intervals at one or more minutes apart, regulated…
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