H. WOODWARD.
`
`ELECTRIC LIGHT.
`
`|
`No. 181,613,
`
`Patented Aug. 29, 1876.
`
`WITVESSES
`
`Sehrfey
`
`Ot
`
`:
`
`.
`
`y
`
`fyfe feMeOEE
`
`N.PETERS, PHOTO-LITHOGRAPHER, WASHINGTON, D. C.
`
`:
`Petitioner Ensign
`Exhibit 1020 - Page1 of 3 ae
`
`
`
`Petitioner Ensign
`Exhibit 1020 - Page 1 of 3
`
`

`

`
`
`UNITED STATES PATENT OFFICE,
`
`HENRY WOODWARD, OF. TORONTO, ONTARIO, ASSIGNOR, BY MESNE AS.
`SIGNMENTS, TO. RUPERT. MEARSE WELLS, THOMAS RICHARD FULLER,
`AND ERNEST HEIMROD, OF SAME_PLACE, AND CHARLES H. WOODWARD,
`OF LINDSAY, CANADA,
`
`IMPROVEMENT IN ELECTRIC LIGHTS.
`
`Specification forming part of Letters Patent No. 18 1,613, dated August 29, 1876; application filed
`January 4, 1875,
`:
`
`To all whom it may concern :
`Be it known that I, Henry WoopDwarD,
`of the city of Toronto, county of York, in the
`Province of Ontario, Uanada, have invented
`new and useful
`improvements in the art or
`process of obtainingartificial light by means
`of electricity; and I do hereby declare that
`the foliowing, taken in connection with the
`drawings which accompany and form part of
`this specification is a description of my in-
`vention sufficient to enable those skilled in the
`art to practiceit.
`In the first place, I use a gas-engine. or
`other suitable motive power, for the purpose
`of rotating a magneto-electric ‘machine, and
`at such a velocity as shall create electricity
`sufficient to heat certain pieces of carbon here-
`‘ inafter described. The magneto-electric ma-
`chine should be of sufficient power for the
`purpose of heating the carbon to a state of
`ineandescence. A piece of: carbon of suita-
`ble size is scraped and shaped until fitted
`for the purpose; one pole is then attached
`to the top of the carbon, and the other to
`the bottom thereof, by suitable electrodes. It
`is then inclosed in a globe or other vessel,
`either of glass or other suitable material.
`The air is then exhausted from the said globe
`or vessel after it has been hermetically sealed
`at the ends, and the globe is then filled with
`a rarefied gas that will not unite chemically
`with the carbon when hot. Electricity is now
`supplied, and in sufficient quantity to heat
`the carbon within the vessel to a state of in-
`candescence.
`Therarefied gas previously in-
`troduced now becomes luminous, and consti-
`tutes the light herein designated as “ Wood-
`ward’s electric light.”
`,
`This arrangement and process will give a
`light of any required intensity, and there is,
`practically, no limit to the number of lights
`that may be obtained from one magneto-elec-
`trie machine.
`;
`_
`In the accompanying drawings, the same
`
`letters of reference indicate the same partseee
`
`in all the views, and also in this specifica-
`tion.
`Figure 1 is an elevation or front view of a
`piece of carbon, and is marked B.
`It is sup-
`posed to be scraped and shaped until suitable
`for the required purpose.
`:
`Fig. 2 is also an elevation or front view of
`& piece of carbon with the electrodes E E
`attached thereto,
`leading to and from the
`positiveand negative poles of the battery, one
`being attached at the top and the otherat the
`. bottom of the carbon.
`Fig. 3 is a sectional elevation, showing a
`globe marked A, but which may be a vessel
`of any other suitable form. The prepared
`carbon B is also shown therein, with the
`aforesaid electrodes E £ attached thereto;
`showing, also, a tube, C, with an air-tight
`stop- cock, to be used in exhausting the air -
`from the globe A, and for the injection of
`rarefied gas into the same ; showing,also,the
`hermetical sealing of said vessel at the ends
`G G of the tubes, and showing,also,
`the
`stand D.
`Fig. 4 is a sectional elevation, showing the
`adaptation of another form of vessel, A,
`This drawing is on a larger seale, in order
`to show the manner of closing the ends of
`the vessel, which is done by brass sockets,
`that at the top being marked K, and that
`at the bottom being marked L;
`showing,
`also, a carbon, B, different in form from that
`in the other vessel, and having the two elec-
`trodes E KE running to and from the poles N
`and M.
`Fig. 5 is an. elevation, showing one mode
`of connecting the various lights with the
`machine by means of two trunk-wires or
`electrodes, H H, running from the positive
`and negative poles M and N of
`the ma-
`chine, with branches } b, &c., therefrom, to
`each light.
`.
`Fig. 6 is also an elevation, showing another
`method of connecting the lights with the
`machine, each light having a distinct wire, b,
`
`Petitioner Ensign
`Exhibit 1020 - Page 2 of 3 ©
`;
`7
`;
`
`
`Petitioner Ensign
`Exhibit 1020 - Page 2 of 3
`
`

`

`2
`
`181,613
`
`state of incandescence,in cotmection with the
`running to each pole M N of the machineor|
`
`battery. _.|describedarrangement.and mode of connec-
`Having thus described my invention,
`I|
`tion of the electrodes EE with the carbon,
`
`claim— _|all as shown andset forth...‘
`
`A earbon, B, in combination with a lamp
`HENRY WOODWARD.
`or other suitable vessel, A, filled with _rare- Witnesses: -
`WILLIAM FITCH,
`fied gas, possessing the property-of not chem-
`j
`
`ieally combining with the carbon when ina[ Gero. T. SMALLWOOD.
`
`
`
`Petitioner Ensign -
`:
`‘
`Exhibit 1020 - Page 3 of 3
`
`
`
`a
`
`oer
`
`Petitioner Ensign
`Exhibit 1020 - Page 3 of 3
`
`