When was the phonograph patented

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The eight antiwar activists were charged with the responsibility for the violent demonstrations at On February 19, , President Franklin D. In Letters Patent No. Upon this cylinder there is a sheet of foil or similar material, and the same is indented by the action of a point moved by a diaphragm, and this foil forms a phonogram that can be usedto reproduce the original sounds when moved in contact with a point and diaphragm.

My present invention relates to improvements upon the phonograph patented as aforesaid, and the features of such improvemeut are hereinafter specially pointed out. In thedrawings, Figure 1 is an elevation of the phonograph.

I is aside view of the diaphragm and the device for moving the same. In my present invention, as in my former patent, the motion of the rccording-sln'face may be derived from clockwork, hand, or other power. In order to insure great uniformity of speed and prevent irregularity in the movement.

The nut l is upon a lever pivoted at 3 and kept in contact by a cam, 4. When this lever and nut P are lowered the shaft X and cylinder A can b: slipped endwise. The arm 5. The screw 8 determines the position to which the diaphragm and recording-point may approach to the cylinder. The spring 9 serves to move the arm 5 away from the cylinder, and the double-ended lockingpieee 10, entering slots in the frame One of the peculiarities of the presentinvention over the aforesaid patent is a spring, 12, of india-rubbcr or other suitable material, placed between the cross-bar or bridge 13 and the diaphragm, that serves as a damper to pre went false vibrations of the diaphragm and cause it to respond only to the actual movement given by the phonogram through the point D.

It is also usually preferable to employ a spring, 14, between the point and the diaphragm. This is useful, in both the phonograph and the phonet, to prevent false sounds. This spring and diaphragm I have used in connection with telephones. In , Thomas Edison wrote, "I have not heard a bird sing since I was twelve.

Yet this man invented the first machine that could capture sound and play it back. In fact, the phonograph was his favorite invention. The first phonograph was invented in at the Menlo Park lab. A piece of tin-foil was wrapped around the cylinder in the middle. You shouted a short message into the piece on one side of the cylinder while you turned the handle.

Inside this piece was a needle. Your voice would make the needle shake, or vibrate. The sound vibrations would go through the needle and make a line, or groove, into the tin-foil.