US181304A - Improvement in furnaces for assaying - Google Patents

Description

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-FURNACES FOR ASSAYING.

Patented Aug. 22,1876-,

Zal/? Wfizmses N. PETERS, FHOTO-LITHOGRAPHER, WASHINGTON, D C.

* UNITED!l [PATENT OFFICE.,

'rnnonon Benen, on New YORK, NQY.

IMPROVEMENT-IN FURNCES FOR ASSAYING.

Specification forming part ofV Letters Patent No. 181,304, dated August 22, 1876; application filed y March I, 1876.

To all whom it may concern:

Be it known that I, THEoDoR M. BERGE, of New York city,have invented an Improved Furnace for Assaying, Enameling, and for other purposes, of which the following is a specification:

My invention consists of a contrivance of' devices for enabling the employment of interchangeable mufdes in assay and other like fur'- naces, in order that the capacity of the mutfle may be suited to the requirements of the case in hand at all times, thus making the furnace better adapted for varying quantities, conditions, and kinds of work, and securing greater accuracy. v

My invention also consists of an arrangement of the opening for the escape of' the gaseous substances, in such manner that the coal-dust and other impurities will be effectually prevented from falling into the mufile, as they-do in the common arrangement, by which the assay is less perfect and accurate.

Figure l is a sectional elevation of my improved furnace, taken on line a a, Fig. 2. Fig. 2 is a section on line b b, Fig. l. Fig. 3 is a horizontal section. Fig. 4 is a side elevation and section of a removable mouth-piece for using di'erent ones to suit mufdes of different sizes. v l

The furnace is designed to be portable, and to that end is constructed of fire-clay inner walls A and metal outer walls B, built on a suitable base, G,for standing on the oor,and adapted for moving the furnace from place to place. D is a removable cover; E and F, doors; Gr, grate; H, ash-pit, and I smokepipe. J represents the muffle, in which the metals and other substances to be treated are placed. It extends across the furnace, and rests on a ledge, X, of the front and back wall, so as to be readily put in and taken out for changing when different sizes are required. K is a removable mouth-piece to the opening in the front wall for the mule. It is made removable for employing different ones adapted to the muffies of different sizes. It closes around the top and sides of' the mufde by its ntch L in the lower end, being dropped down from .the opening of door E in the dovetail notch M of the re-brick wall. The, ledge N closes around door F. The notch L of each mouthpiece will be fitted to the particular muile with which it is to be used. A

To 4fit the diEerent sizes in the back wall, it is constructed with a ledge,.O, to it the largest sizes, and another ledge, P, for the next size, and the mufes of smaller sizes are provided with a flange, Q, to fit theledge P. Thus, I secure tight joints at the ends of the removable mufes of different sizes without difficulty or delay when changing them.

H'eretofore the opening R for the escape of the gaseous products of the assay has been made in the top ofthe muffle, and the iiue S, for conveying them off, has been arranged directly over it, so that ashes and other matters have dropped `from the flue I into the muffle, and mingled with the metals and other substances under treatment to the injury of the same, and making the assay inaccurate, I therefore make the said passage horizontal inf the end of the muffle, and extend the flue S below it sufficiently to receive and retain the droppings.

In order that the heat may be cooled oft' as soon as possible after it has done its work, so as to economize time, I `have the grate arranged on projecting lugs T of the bottom plate U for its support, and have a notch, W, in it, which, being turned tothe adjacent lug T, lets the grate, together with the fire, fall in to the ash-pit-for being drawn out quickly. The cooling of the furnaceV is also facilitated by the .walls being surrounded by the atmosphere.

The advantage of having muffles always adapted in size and capacity to the work in hand is very important, as will be apparent to the skilled assayer for various reasons, besides the wider range of uses for which it adapts the furnace.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. An assaying-furnace having the front and back walls constructed and arranged to Stantilly as dscl'ibed.

2. The mufle J, having a flange, Q, in comes, substantiallyas descvibedl.,

3. The mue having the escape-passage R` THEO.` M. BERGE.

In prsence of- WMaLKVEAew WWK;

AUGUSTUS VAN WYCK.

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