Viewing page 9 of 53

12

[[strikethrough]] W  [[/strikethrough]] Reproducing magnet will follow ink line without touching it.

Reproduction of sounds without any friction upon record -

Difficult to obtain ink line of sufficient body -

Method of overcoming this difficulty

[[strikethrough]] L [[/strikethrough]] Record on phonograms to be recorded and line filled with magnetic paste. -

Sectional view of disk prepared as above. -

[[end page]]
[[new page]]

13

Wednesday Mar. 30-1881

pen - the point of the magnet to be as close as possible to the ink line without actually touching it.

Upon rotating the cylinder the magnet attached to the diaphragm should follow the irregularities in the line without touching it. - [[strikethrough]] and [[/strikethrough]] if this is the case the sounds will be reproduced, and owing to the [[strikethrough]] frictional [[/strikethrough]] absence of [[strikethrough]] any [[/strikethrough]] friction [[strikethrough of illegible letters]] during the reproduction the sounds will be much more faithfully reproduced.

The principal drawback about this method, seemed to be the difficulty of obtaining a line of sufficient body to be rendered magnetic, and capable of attracting the magnet attached to the diaphragm.  This difficulty can be entirely overcome by simply engraving a disk as described on pages 1-3-5 & 7 and then filling the groove with a paste made of fine iron particles.  A sectional view of a disk prepared in this way would be  as shown in the following diagram: [[arrow pointing to hand drawn diagram]]

[[hand drawn diagram depicting sectional view with notations identifying parts as follows:
End of reproducing magnet
Disk K. Fig. 1. page 1-this Vol.
Grooves filled with magnetic substance
Producing magnet]]

The disks can be made of some suitable soft substance that can be easily engraved, and which is non-magnetic, such as rubber, or ivory, or celluloid.
Noted by S.T. Mar. 30 1881 -
Please note that the language and terminology used in this collection reflects the context and culture of the time of its creation, and may include culturally sensitive information. As an historical document, its contents may be at odds with contemporary views and terminology. The information within this collection does not reflect the views of the Smithsonian Institution, but is available in its original form to facilitate research. For questions or comments regarding sensitive content, access, and use related to this collection, please contact transcribe@si.edu.