US278380A - Thermometer - Google Patents

Description

(Modhel.)

E. WEINEAGEN.

E y THERMOMETER. Noyz'aao; i Patented May 29W, 11883.

ot' Hoboken,

any other suitable form, so long as it joins the 40 5o they are alike, the instrument will be in proper `mometer seen from its iiat side a, Fig. 3. Fig.

Fig. 3 is'a cross-section,

Asimilar sections ofmoditications Vof the instrut surfaces, all as hereinafter more fully described.

junctions of theat side of the thermometer tened face, a. By attened, in this connecscales beingeither one like the other or one PATENT OFFICE.

Ernani? WEINHAGEN, oEHoBoxnN, NEW JERsEY.

,SPECIFICATION forming part of Letters Application tiled February 8, 1883. (Model.)

To` all whom 'it may` concern Be it` known `that I, HENRY WEINHAGEN, y in the county of Hudson and` State of New Jersey, have `invented an Improved Thermometer, ot'whiclr the following, is a specication.

Figure lis an elevation of my improved ther- 2 is an elevation oftheinstrument when looked at in the direction of the dotted line bf, Fig.

on an .enlarged scale, of the instrument. Figs. 4 and 5 are ment. l

- The object o f this'in-vention is to produce a magnifying-thermometer on whichthe mercury column and the scale will be superposed, and near the edge of` the enamel reticctor, so

as to be perceived at a glance in the same row or line, which line at the same time 4is made the line of enlargement, so far as the appearance of the mercury column is concerned.

The invention consists in combining a liatfaeed thermometertube with an inlaid enamel for the background, and in providing it with a scale at thejunction of its convex and iiat The invention also consists in providing both with the convex face with separate scales, and in so shaping the inlaid enamel as to be a reiiector andan eye-guide for each of the scales, as hereinafter more fully described. I

ln the drawings, A represents a thermometer-tube made of glass, and made with a fiattion, I mean a face either perfectly iiat, as shown in Figs. 3, 4, and 5, or nearly so, or of convex portion d of the circumference of the thermometer-tube by one or incre small curves, c e. 1,The bore f of the tube is by preference elongated, as shown.' There is a scale, g, at one junction of the flat side a with the con vex sided,and `there may be another scale, 7L, at the other junction 'ot said at and convex sides, as clearly shown in Fig.3, lthe said different from the other, as may be desired. If

position forobservation, no matterhowit happens to lie in the hand ofthe partyusing it. If

Patent No. 278,380, dated May 29,1883.

| madewith separate scales-such, for example,

as Reanmur and Fahrenheit, or Fahrenheit "and Celsius-the observation'can bemade on either.` ofthe scales, as may be most advantageous. In `the body of the tube A, between its curvilinear circumference d and it's boref, is contained the enamel t, which is to constitute the reflectingsurface for the mercury column and the scale. Thisenamel is 'laid in preferably curvilinear form into the body ot' the glass, so as to extendnearly from the line b fto the line h j', as shown in Fig. 3; but it should not quite run to these lines. The said lines bfand h f are the lines ot observation for the instrument. A glance at Fig. 3 will show that the enamel z' will be a reflecting-body for themercury column, and also for the corresponding scale, `no

`matter which ofthe lines bfor h fis used as a line of observation at any one time. At the same time the enamel, coming very near to the line of observation, makes the use of the instrument convenientthat is' to say, in magnifying-thermometers as they had heretofore been made it was usually a 'matter of greater or less difticnlty to find the correct position for the observation ofthe instrument, so that` the greatest enlargement ot' the mercury column would be realized. Persons handling these instruments were apt to waste much time in their endeavors to find the correct pofailed to lind it at all, and had to use for their examination of the instrument the reduced appearance of the mercury column.

`sition for such inspection, and frequently they By the use of my improved thermometer as shown in Fig. 3 the inspector, holding the in strument in his hand, will examine it directly above the edge of the enamel t', andrwill at that place iind the correct position for the examination ot' the instrument. ln other words, when the instrument is held in the hand so that the mercury column is entirely concealed by the enamel, and then gradually turned so as to bring the edge of lthe enamel opposite the eye, the enlarged mercury column will ap- 'pear t`o lie on the enamel, and Will then be traversed by the corresponding scale, so that the examination of the instrument will be at Vtended with nofurther difficulty;` but, on the. contrary, the mercury column will appear to be in a state of support on the enamel, and

`:the dicult feat heretofore required cf draw"l I ing imaginary lines from that column to the gradations of the scale willbe avoided. The result thus indicated, and which Fig. 2 is intended to show, will be the same whether the instrument is looked at on the line b for onv the line h f.

Although it is quite desirable to thus make a double instrument capable of use with a double scale, yet the main advantages of my invention will be enjoyed even where the instrument has but one scale, as indicated in Fig. 4, where the enamel t is vcarried beyond -the line h f, so as to prevent the mercury column being seen on thatline, allowing it to be only inspected on the line bf.

Fig. 5 shows afurthermodication of that which is indicated in Fig. 3, said modification consisting in a different form of enamel t',

. which difference in form, however, will, as is clear from an inspection of the drawings, produce no substantial difference in effect.

I desire to have it particularly understood that I regard it as a special advantage to place the enamel i as near to the mercury-bore f as possible, and as far away from the circumference of the glass as convenient, for it must be quite clear that the advantages of certainty of examination above alluded to are obtained by bringingthe enamel asfarintotheinteriorof the instrument as possible. In order t'o make this quite clear, the lines bf and hf have been continued in Fig. 3 beyond the mercury-bore, and a curved dotted line, j, is drawn on the outer side of the instrument to indicate the place of the ordinary enamel backing, which place .would be the correct one for observing the instrument from either scale g or h.' It will at once be perceived that such an exterior backing ot' enamel, in that it does not reach near to the lines b f and h f, deprives the observer of the facility of finding the enlarged appearance of the mercury column, which, with the interior enamel, fi, is found by looking over the edge of the enamel. If, on the other hand, such outside enamel, j, should be carried close to the lines b f and h f, the result would be that theopportunity of lapping the scales g h over the angles4 of the instrument would be lost.

By enamel reflector i I mean a reiiector made of any suitable material.

I claim- 1. In a thermometer having lat face a and curved face d, and` scale g at the junction of said faces, the combination thereof with the enamel reector i, which extends near to ay line. drawn from the bore of the instrument through the scale g, as specified.

2. A thermometer having scales g It at the junctions of its faces a d, and having inner bore, f, in combination with the enamel relector Vt', which is interposed between the bore and the circumference of the thermometer, and extends from near the line thatjoins the bore with one scale to near the line that joins the bore with the other scale, substantially as described.

3. In a thermometer, the enamel reilector fi, placed around the bore f, so as to embrace it on two sides and extend behind it, substantially as herein shown and described.

HENRY WRINHAGRN.j`

Witnesses:

HARRY SMITH, WILLY G. E. SCHULTZ.

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