| No. 775,840. | Patented November 22, 1904. | |
UNITED STATES PATENT OFFICE. ROBERTO LANDELL DE MOURA, OF NEW YORK, N. Y. WIRELESS TELEGRAPH. SPECIFICATION forming part of Letters Patent No. 775,846, dated November 22, 1904. Original application filed October 4, 1901, Serial No. 77,576. Divided and this application filed January 16, 1902. Serial No. 89,976. (No model.) | ||
To all whom it may concern:
Be it known that I, Roberto Landell de Moura, a citizen of the Republic of Brazil, and a resident of the city of New York, (borough 5 of Manhattan,) in the county and State of New York, have invented a new and Improved Wireless Telegraph, of which the following is a full, clear, and exact description.
My invention relates to a wireless-telegraph
10system employing common electric waves, and
contemplates the use of such waves, either di-
rectly transmitted — that is, non-reflected—or
reflected and of short lengths, in connection
with certain apparatus and devices for 15gener-
ating and responding to the same to send and
receive graphic and harmonic or phonetic sig-
nals through space or, it may be, through fogs
or through water.
The present application is a division of my
20former application, filed October 4, 1901, Se-
rial No. 77,576, for an improvement in wire-
less telephones and telegraphs.
According to my invention a local circuit is
provided which may be either constantly or
25intermittently closed and in which is connect-
ed a device capable of giving a continuous or
an intermittent sound. This sound-produc-
ing device is energized by a local battery, and
its action is modified in intensity in 30accord-
ance with the intermittent electric impulses
from the sending-station, which act upon a va-
riable-resistance device, (which may be a co-
herer.) For continuous sounds the variable--
resistance device does not act specifically as a
35coherer, but more properly as a very sensi-
tive granular microphone whose resistance is
controlled by the impulses from the sending--
station, these changes in resistance effecting
the intensity in the sound by affecting the 40lo-
cal current-supply to the sound-producing de-
vice.
Although I thus specify and shall describe
the use of a local circuit, however I wish to
say that there are other means by which my
45invention may be practiced. The underlying
principle is simply that of modifying the re-
sistance of the local microphone, and the func-
tions of the receiver may be exercised by any
radio-detector of the Branly type provided
with a controllable electrode. Furthermore,50
although I speak of reflected impulses and
short-length waves, these are not essential, al-
though I use them in some cases and at rela-
lively short distances in order to obtain im-
proved effects. The same holds with regard55
to certain light or other active rays used in
connection with reflected waves.
My invention is illustrated in the accom-
panying drawings, in which the same refer-
ence characters indicate the same parts in all60
the figures.
In the drawings, Figure 1 is a diagram rep-
resenting the entire telegraphic apparatus
used at one of the stations. Fig. 2 is a sec-
tion showing a part of the transmitting and65
receiving apparatus. Fig. 3 is a front eleva-
tion of the upper portion of the same, and
Fig. 4 is a detail view showing my device for
producing telegraphic signs phonetically.
The apparatus consists of a stand A.(see Fig.70
2,) a barrel B, a smaller barrel C, a sparking
device D, receivers E, and a sparking device
F. (See Fig. 1.) The frame 1 (see Fig. 2)
of the stand A is mounted upon vertically--
disposed concentric tubes 2, the outer of which75
is movable and is connected with a rack and
pinion 3, actuated by a handle 4, whereby the
barrel B may be raised or lowered at will.
The barrel B consists of two cubical or cylin-
drical boxes 5, telescopically adjustable one80
in the other, upon one of which boxes are
mounted a telescope 6, a spirit-level 6ª, and a
compass 7ª for the purpose of training the
barrel upon a distant station. The barrel is
provided with a parabolic mirror 8 and an85
electric light 9 for use in my wireless tele-
phone, which is fully described in my other
application.
