Viewing page 8 of 53

This transcription has been completed. Contact us with corrections.

[[blank page]] 
[[start page]]
6
Monday Feb. 6-1882-
In all the reproducing arrangements where a vibrating magnetized point has been used, the plane of vibration has been perpendicular to the surface of the plate containing the phonogram. All these arrangements have given inferior articulation to that obtained by using a rigid point and coil of wire. 
Before giving up the vibrating point however, I considered it advisable to try the effect of allowing a point to vibrate [[underlined]] parallel [[/underlined]] to the surface of the plate, thus: 
[[image: arrow pointing toward technical diagram]]
While experimenting with a magnet - B observed that a piece of sheet iron when placed with one edge in contact
with a pole of the magnet, took up a position parallel with the lines of magnetic force, and that when it was deflected from this position it would instantly return to it. I then cut a piece of soft iron into a triangular shape and fitted up the apparatus shown in the next diagram Fig. 5 -
A. is the iron phonogram - B. compound magnet with triangular piece of iron C attached to one pole. 
The point of the triangular piece of iron nearest the opposite magnetic pole was then adjusted 
Note by S.T. Feb. 6th 1882 --- over