| |
 |
|---|
| Henry return |
| Documents Bell |
|
Alexander
Graham Bell
|
||
|
|
DOCUMENTS:
|
|
|
Letter from Joseph
Henry
to Alexander Graham Bell, April 29, 1875
Copy of a
letter written in 1875 by Joseph
Henry, Secretary
of the Smithsonian Institution, to Alexander Graham Bell, that is of
value
in that Professor Henry writes: "I think your experiments are new and
that
they offer the true explanation of the phenomenon you have
observed." (Original
letter in "Dr. Bell's Room" in
"Biographical
Material").
|
||
| Washington, April
29th 1875 A. Graham Bell, Salem, Mass. Dear Sir: Your letter of April 2nd was duly received but a press of business has prevented an earlier reply. I think your experiments are new and that they offer the true explanation of the phenomenon you have observed. Many years ago I made a series of experiments, with the late Mr. Jos. Saxton, with a galvanic trough of about 60 cells; the current of which produced a light between two carbon points. When an image of this light was thrown on the ceiling, by means of a rapidly revolving mirror placed obliquely to the axis of rotation which was perpendicular to the horizon a circle of light was produced not entirely continuous of the same intensity, but marked with brighter and lighter shades indicating pulsatory action in the current. This fact appears to have a bearing on the phenomenon you have observed. Very
truly yours, |
||
