44 J, H. Lane on a Mode of Photographing Meicors. 
marked upon the meteor’s track, should, in general, be preserved 
in the transition from one plate to another in all situations of the 
track, or in other words, that every two adjacent cameras in the 
system shall be capable of marking, in the manner described, the 
same common point of time upon the track of a meteor, but the 
exact difference in time can always be known. 
In the execution of such a plan as this, two stations are to be 
selected at a suitable distance, and a system of cameras estab- 
lished at each, of such range that the two may cover in common 
a sufficient extent of the upper regions of the atmosphere to af- 
ford a fair chance for the occurrence of meteors. Hach station 
ap 
cameras of the system, and on the extinction of the meteor will 
promptly replace the screen. 
e expense and trouble of this process will certainly be great, 
but will not be disproportioned to the importance of the object 
in view. Only let us have a photographic surface that will give 
a visible trace of the meteor’s path, in the face of exposure to the 
light of the sky during the time of the meteor’s visible flight, 
and then success, as regards the attainments of an accurate re- 
cord, will be nearly gain, and we should not hesitate at the 
expense and trouble. 
of water about 224,000° Fah. With such a velocity, so many 
times exceeding that of sound, the masses of air lying in the 
