Frazer. ] 532 [April 9, 
ined under a low power of the microscope, the beginning and end of the 
record made by each vowel-sound being designated, by the letter appropriate 
to it. 
In order to exhibit these records, a further modification of the mounting 
was made. The separate sounds were cut from the glass, separated, and 
glued in vertical lines upon the glass. 
By means of reversing the direction of the projecting microscope and 
illuminating this record strongly by the condensers alone (a system 
of megascope projection well performed by Mr. Holman, of the Frank- 
lin Institute), not only are the impressions on the foil rendered distinct- 
ly visible but a line of them can be brought into focus at once and their 
local and accidental, compared with their fundamental and important dif- 
ferences. 
The wood cut below will explain the nature of these differences : 
*The characteristic of the sound A will be observed to be an alternation of 
*Ten days after the above observations were made my attention was called to 
an article of Prof. Mayer, on the Phonograph in the last number of the 
Popular Science Monthly, in which he figures the impression made by “a” in bat 
and compares the section of the depressions made by the stylus in vibrating to 
this vowel] with the shape assumed by the Kénig’s flame to the same sound, 
There is one impression more on this record of Prof, Mayer than on the ma- 
trix which was the basis of these remarks; nor in the latter are the ‘‘ dots and 
dashes” separated from each other so completely as thus seems to be in his ex- 
periment, 
