US794771A - Formaldehyde candle. - Google Patents

Description

,JJM I 7% PATBNTED JULY 18, 1905. A. BAUER & B. K. HOLLISTER.

FORMALDEHYDE CANDLE.

APPLICATION FILED JANA. 1904.

Int/anions,

UNITED STATES Patented. July 18, 1905.

PATENT OFFICE.

ALECK BAUER AND BERTRAM' K. HOLLISTER, OF CHICAGO, ILLINOIS,

ASSIGNORS TO BAUER & BLACK, OF CHICAGO, ILLINOIS, A CORPO- RATION OF ILLINOIS.

FORMALDEHYDE CANDLE.

SPECIFICATION forming part of Letters Patent N 0. 794,771, dated. July 18, 1905.

Application filed January 4, 1904:. Serial No. 187,642.

To all whom it ntzzy concern.-

Be it known that we, ALEoK BAUER and BERTRAM K. HoLLIsTER, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Formaldehyde Candles, of'which the following is a specification.

The object of this invention is to provide a formaldehyde candle of simple and compact form for reverting into a gaseous state a polymeric formaldehyde, technically known as paraformaldehyde and commercially known as paraform.

A further object is to make a candle of this character which can be safely used, which will readily ignite and burn without sparking or flaming, and which will produce a perfect vaporization of a comparatively large quantity of paraformaldehyde with a minimum amount of combustible material.

The accompanying drawings illustrate one embodiment of the invention, and, referring thereto- Figure l is a perspective view of the candle. Fig. 2 is a sectionalview on the line22 of Fig. 1. Fig. 3' is adetail perspective view of one of the tablets.

The candle comprises a shell 11, made of charcoal .or other suitable combustible material which will burn withoutsparking or flaming and not ignite by friction. This shell is divided by cross-walls 11, forming an integral part of the shell and made of the combustible material into a plurality of separate compartments, which are open at top and bottom, as shown inFig. 2. The paraformaldehyde is formed into tablets 10, adapted to fit in the compartments of the shell, and they are held in place in the shell by frictional engagement with the walls of the compartments. The corners of the tablets are preferably cut away, as shown in Fig. 3, so that spaces 12 will be left between the tablets and each cortion of the heat and gas and also promote the efliciency of the candle by allowing the gas to escape more readily.

The shell and the tablets are proportioned so that suflicientheat will be produced by the combustion of the shell to completely vaporize the tablets. By subdividing the paraformaldehyde into a plurality of tablets and completely surrounding each tablet with a wall of combustible material forming a part of the shell welind that a large quantity of the paraformaldehyde can be vaporized with a comparatively small quantity of the combustible material. The vaporization of the tablets proceeds downward to the same degree and coincidently with the combustion of the shell, which also burns downward. The walls of the shell are sufliciently exposed to take up from the atmosphere all the oxygen required to insure perfect and even combustion.

To facilitate igniting the shell, we may provide a kindler 13 around the shell near its upper edge and made of some readily-ignitible material, such as paper coated wit-h saltpeter.

In practice the shell is ignited at its upper edges by first igniting the kindler or in any other suitable manner, the cross-walls 11' becoming ignited from the outside walls. The shell will burn without sparking or flaming, and for this reason the candle can be used with perfect safety; but as a further precaution the candle can be placed in a plate or saucer, if desired, or the candle can be used in connection with the holder covered by United States Letters Patent No. 7 7 3,145, granted on October 25, 1904, to the under signed, B. K. Hollister, assignor. This holder is adapted to be formed into a support for the candle while burning. The tablet may be made in a single piece, as shown in Fig. 3, or in'several pieces adapted to be nested one above the other in its compartment.

What we claim, and desire to secure by Letters Patent, is

1. A formaldehyde candle comprising a shell made of charcoal, cross-walls forming an integral part of the shell and dividing it into a plurality of separate compartments open at top and bottom, and tablets of paraformaldehyde' arranged in said compartments.

2. A formaldehyde candle comprising a shell of combustible material, cross-walls forming an integral part of the shell and dividing it into a plurality of separate comartments open at top and bottom, and tabets of paraformaldehyde held in said comnear its upper edge.

ALECK BAUER. BERTRAM K. HOLLISTER.

Witnesses:

G. D. LYON, W. J. MCDONALD.

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