Pyrometer. Page: 2 of 3
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UNITED
STATES
PATENT OFFICE.
HENRY VON KOEHRING, OF SEGUIN, TEXAS.
PYROMETER.
SPECIFICATION forming part of Letters Patent No. 664,764, dated December 25, 1900.
Application filed July 5, 1900. Serial No. 22,644. (No model.)To al whorc it imay concern:
Be it known that I, HENRY VON KOEHRING,
a citizen of the United States, residing at Se-
guin, in the county of Guadalupe and State of
5 Texas, have invented certain new and useful
Improvements in Pyrometers; and Ido declare
the following to be a full, clear, and exact de-
scription of the invention, such as will enable
others skilled in the art to which it appertains
ro to make and use the same.
My invention relates to pyrometers of that
type in which a column or series of balls of
high expansive power is employed in conjunc-
tion with a metallic tube of less expansive
15 power; and the present invention is an im-
provement upon the pyrometer shown in my
United States Letters Patent No. 637,343,
dated November 21, 1899.
The object of this invention is to obviate
20 certain defects incident to the construction
shown in said patent and to provide a highly-
sensitive pyrometer which is simple in con-
struction, cheap to manufacture, adapted to
be readily used for any ordinary cooking-
25 stove, and not liable to irregularity, and one
in which the sensitive indicator-operating de-
vices are exposed to direct heat, and the py-
rometer thereby rendered accurate and reli-
able.
30 With this and other minor objects in view
the invention consists of certain novel fea-
tures of construction, combination, and ar-
rangement of parts, as will be hereinafter
more fully described,and particularly pointed
35 out in the appended claims.
In the accompanying drawings, Figure 1 is
an elevational view of a pyrometer embody-
ing my invention, showing the outer inclos-
ing tube and bent tube in vertical section.
4o Fig. 2 is a cross-section through the outer tube.
Referring now more particularly to the
drawings, in which like reference characters
designate corresponding parts throughout
both views, the numeral 1 represents an outer
45 inclosing tube or shield of convenient size,'
of steel or other suitable material, of low ex-
pansive capacity, and open at its lower end
and closed at its upper end by a head or top
plate 2. To the under side of this cap'or plate
5o are secured the upper ends of two or more ver-
tical columns 3, grouped about a central rod4 and made of some poor conducting material
of low expansive capacity,such as glass, china,
earthenware, graphite, &c. These columns
are protected by the tube 1, and arranged be- 55
tween the same is the rod 4, and they are
united at their lower ends by a metallic head
or plate 5, located above the lower open end
of said tube 1. The rod 4 is made of zinc or
other metal of high expansive capacity and 6o
is mounted between the non-conducting col-
umns 3, its lowerend being seated upon an ad-
justing-screw 6, mounted in the head or plate
5. The outer inclosing tube 1 thus serves the
dual function of a shield to protect the fragile 65
non - conducting columns 3 and conductor
for bringing the heat in direct contact with
the entire surface of the rod 4. The columns
3 act, in conjunction with the heads or plates
2 and 5, to provide an open or foraminous 70
frame for the sensitive rod, the spaces be-
tween said columns serving as ports or pas-
sages to allow the heat to come in direct con-
tact with the rod and also as non-conducting
guards to prevent the rod from being unduly 75
influenced by sudden changes of temperature
affecting the tube 1, such as produced by the
opening of the oven-door of the stove, &c.,
whereby accuracy is insured and irregular ex-
pansion and contraction of the rod obviated. 8o
In my aforesaid patented construction the
lower balls of the column of balls are heated
by radiation from the tube in which they are
inclosed and being in direct contact with said
tube are unduly influenced by drafts of air 85
coming in contact therewith, whereby the py-
rometer is rendered to a certain extent irreg-
ular and inaccurate. By, however, employ-
ing the construction above set forth this dif-
ficulty is entirely prevented. 90
A represents a tube of steel or other suit-
able material of low expansive capacity hav-
ing its lower end straight and vertical and
fitted in the plate or cap 2 and loosely receiv-
ing the upper end of the rod 4. This tube is 95
provided with two rectangular bends a and b
and is closed at top by a cap C, to which is
connected a dial D. To the dial is pivoted a
hand or pointer F, to the axis of which is con-
nected a pinion 7. This pinion meshes With oo
a rack or toothed segment 8, mounted upon
the long arm of a lever 9, eccentrically piv-
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Von Koehring, Henry. Pyrometer., patent, December 25, 1900; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth514330/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.