42 J. H. Lane ona Mode of Photographing Meteors. 
Arr. V.—On a mode of employing Instantaneous Photography as 
a means for the Accurate Determination of the Path and Velo- 
city of a Shooting Star, with a view to the Determination of ts 
Orbit; by JonaTHAN H. Lane. 
Recently, however, a method has occurred to me of applying > 
subject to change. 
he basis of the proposed process, as already intimated, is the 
extraordinary advances that have been made within a few years 
in the preparation of the sensitized surfaces of photographie — 
plates, whereby artists are enabled to produce jd pictures by — 
an exposure of a very small fraction of a second—so small as to — 
afford a tolerable definition of objects in motion, such as sailing 
essels. This holds out encouragement for a hope, at least, that 
reached, that it will be hereafter. I need therefore make no — 
apology for placing the suggestion on record previous to direct — 
experiment on this point. 
_ In the first place, simple exposure in a camera, at a given sta- — 
tion, would give the apparent track of a meteor as seen by the 
observer at that station, and a pair of such records made in two — 
cameras at two stations, would give the track in absolute space. — 
In the second place, if one of the two cameras were furnished with — 
amechanism by which equidistant points of time should be marked — 
upon the trace made in that camera, these points could be referred — 
to the real ae in space, and if both cameras were in like manner — 
furnished, the two records would, to that extent be a check pe 
each other, and serve to reduce the limits of probable error. ‘The 
