US602613A

US602613A - Pyrometer

Info

Publication number: US602613A
Authority: US
Publication date: 1898-04-19
Anticipated expiration: 1915-04-19

Description

D. BAKER. PYRoMETl-:R-

(No Model.)

uns!! Nrrnn STATES irren.

PATENT PYROM ETER.

SPECIFICATION forming part Of Letters Patent NO. 602,613, dated April 19, 1898.

Application iiled January 7, 1897.

To all whom t may concern.-

Be it known that I, DAVID BAKER, of Sparrows Point, county of Baltimore, and State of Maryland, have invented a new and useful Improvement in Methods of Measuring Temperatures, of which the following is a speciiication.

This invention has reference to a method of measuring very high temperatures, such as exist in ovens, gas-fines, furnaces, die. and the invention consists, primarily, in passing saturated steam under a uniform pressure and temperature through a chamber exposed to the influence of the heat to be measured and in determining the temperature of the steam after its passage through this chamber.

In the accompanying drawings, Figure l is a longitudinal section through my improved pyrometer in the form I prefer to adopt, the same being shown as applied through the rebricks of a furnace for measuring the temperature within the same. Fig. 2 is a transverse section through the same on the line a a.

Referring to the drawings, the apparatus which I prefer to employ in carrying out my method is formed of a casting or casing l, which is shown as extended in the wall of a furnace, with its inner end exposed to the influence of the heat within the furnace. This casting has formed in it two longitudinallyextending semicircular chambers 3 and 4, which communicate at their inner ends, as plainly shown in Fig. l.

5 represents a capsule or bulb, of platinum or analogous material, iixed to a nut or head 6, tapped in the inner end of the casting and forming a chamber which is exposed t0 the heat within the furnace. The interior of this chamber communicates with chamber I by means of a passage '7, extending longitudinally in the central portion of the casting from the upper end of the chamber 4 to the interior of the bulb. The interior of the bulb also communicates with the external air by means of a' second passage 8, extending longitudinally along the central portion of the casting parallel to the passage 7, the lower end of this passage 8 being provided with a tube 9, which extends into the bulb. By the passages and chambers described steam introduced into chamber 3 will pass from the. inner end of the same to the chamber 4, thence Serial No. 618,244. (No model.)

outward, leaving the same near its outer end by the passage 7, through which it will enter the bulb 5. The steam will leave the bulb through the pipe 9 and passage 8 and pass to the external air at the outer end of the casting.

In order to utilize this apparatus for measuring the temperature Within the furnace, steam is introduced from any suitable source into an entrance-pipe 10, com mu nicating with chamber 3, and is maintained at uniform pressure and temperature by a pressure-regulator ll, which is applied to a pipe l2, communicating with the upper end of the chamber 4.-. The steam in its passage through the apparatus is exposed while in the bulb 5 to the influence of the heat within the furnace, and its temperature after leaving the bulb and while in the exit-passage 8 is measured by means of a thermometer 13 having its bulb inserted in this passage. The temperature of the interior of the furnace in which the bulb is exposed may by this means be computed by the comparative temperature of the steam when it enters the apparatus and its temperature as indicated by the thermometer in the exit-passage, the computation being based on results obtained by previous experiments with an apparatus in a furnace in which the temperature is known or is measured by other means.

The use of steam as the medium for determining the interior temperature by passing it through a chamber exposed to the influence of this temperature possesses advantages not attainable by the use of other iiuids, mainly on account of the ability to maintain the steam at a uniform pressure, and consequently at a uniform temperature, on its entrance, and, further, the steam carrying no solid matters, there will be no liability of the passages in the apparatus becoming clogged by sediment.

I am aware that water has been passed through a chamber exposed to the infiuence of the heat to be measuredand its temperature thereafter determined, and I am also aware lthat air has been subjected to the action of the heat to be measured and the tension of the incoming and outgoing air compared to determine the interior temperature; but I believe myself to be the iirst to subject steam at an unvarying temperature and uniform pressure in a Chamber exposed to the inuenee of the heat to be measured and to determine the temperature of the steam after being thus exposed, and to sueh I lay broad claim Without regard to the particular form of the apparatus for accomplishing the same.

Having thus described my invention,what I Claim is- The method of measuring high degrees of heat which consists in passing-a current of saturated steam through a chamber exposed to the influence of the heat, thereby superheating said steam, maintaining said current at a uniform, unvarying pressure and tem- I5 perature before it is superheated and determining the temperature of the superheated steam.

In testimony whereof I hereunto set my hand, this 6th day of January, 1896, in the zo presence of two attesting Witnesses.

DAVID BAKER.

W'itnesses:

JOHN F. PARKER, JAS. D. WOODRUFF.