DE211893C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

'- M 211893 - CLASS 42 /. GROUP

MAX ARNDT in AACHEN.

Patented in the German Empire on January 10, 1908.

The present invention has the purpose of air or other gases to certain gas admixtures to check, so z. B. the air in living rooms or hospital or work rooms, etc. approximately to its carbonic acid content or to examine their degree of deterioration, using the known By changing the color of one or more on a thread, string,

ίο a band or the like. Reagents applied. The invention consists in that two or more threads or cords or ribbons o. The like. Each carry or contain a reagent, in any way so with one another Be brought into contact that it also the reagents of both threads for the purpose come into intimate contact that a uniform connection or mixing of the Reagents or even application of a reagent to one (or more) Examination thread is effected by means of the other thread.

You could simply put the threads on top of each other and so they can absorb each other allow each other to act. However, the suction power would soon decrease or stop completely, because the insoluble substances, salts, Deposit carbonates, etc., inside and outside the filaments. It is therefore beneficial, yes It is even necessary that both threads are moved as continuously as possible so that they are always fresh Pieces of thread or fresh reagents come into contact with one another.

The movements required to touch the two threads α and b can be effected in any way and either by hand or automatically by any means, e.g. B. by a clockwork axis by means of two track disks or by other mechanical drive.

The threads can also touch each other several times.

Fig. Ι shows z. B an embodiment of the air tester with two threads α and b serving as reagent carriers, of which thread b contains a liquid or moist, but thread α contains a dry reagent.

The thread α previously provided with the dry reagent can unwind from one roll a ¹ and wind it up again onto another roll a ^2.

The thread b can be wound into a ball b ¹ immersed in a liquid reagent β , which is located in a container c , which can be sealed with any airtight seal, e.g. B. is provided with a rubber cap d, from which the evenly wetted with the reagent e thread b is pulled out to be brought into contact with the dry thread α immediately afterwards, whereupon it can also be rewound on a roll b ² .

The automatic bringing into contact

of the threads α and b takes place here by passing the threads crosswise to one another. For this purpose, for example, the thread α is guided over a roller r ¹ and the thread b over two rollers r ^s and r ^{l in} such a way that the two threads cross one another at m and thus touch one another here.

Since the thread δ has a certain suction force, the degree of its wetting can be determined

ίο change as required, if the thread b after touching the thread a (or even before), roughly as drawn dotted, z. B. passed over rollers r ² and r ⁵ , leads back down, the suction force of the thread b is greater, the deeper the roller r ^{2 is} arranged or set.

The speeds of the threads α and b can be the same or different.

The rewinding of both threads α and b on the rollers a ² and δ ² can, for. B. be done by weights g ¹ and g ^{2, respectively.}

A scale k with different length divisions related to different test conditions and to different properties of the reagents is used to read the test result.

Fig. 2 shows an embodiment of the air tester in which the thread α is pulled down after its intersection with the thread δ and thereby supports the absorbency of the thread b , and in which the rewinding of the threads α and δ by a friction cord o. * the like is caused., the s r over the track wheel ³ and rollers ⁸ and R ^9, a ² and b ² passed and with- a tension roller o. the like. k is debited.

Fig. 3 shows an embodiment of the air tester in which the meeting or touching of the two threads α and δ takes place in the track s of a common guide roller r ³ .

FIGS. 4 and 5 show this arrangement even more clearly.

Fig. 6 shows an embodiment of the air tester in which both threads α and δ moistened are drawn from a reagent e ¹ or e ² and, crossing at m , come into contact with each other, for which purpose they are via rollers r ¹ and r ² or r ^s and r * can be routed.

The dry or liquid reagents can be of various types, and either one, depending on the test purpose. Color or discoloration of one of the test threads α and b or both threads. Furthermore, one thread can simply be pulled out of water, so that it moisten the other, dry thread with water and only thereby initiates its ability to react.

For example, if the thread a (Fig. 1 and 2) was pulled through an alcoholic phenolphthalein solution before it was used, i.e. saturated with it and then dried again, there is also lime water in the container c and in it that of a ball δ ¹ or otherwise wound thread δ and the track disks s ¹ and s ^{2 are held} by a clockwork axis f or in some other way in constant slow rotation, the apparatus according to FIGS. 1 to 5 exposed to the air to be tested or the gas mixture to be tested acts as follows:

The dry thread α is slowly unwound from the roll a ¹ and the moist thread δ is slowly pulled out of the lime water e . Since both threads α and b moved in this way are intimately touching at m , the dry thread α, prepared with phenolphthalein, constantly sucks one evenly Part of the lime water content of the thread δ, with the well-known violet color appearing on the thread a , which disappears the earlier the more the air to be tested contains carbonic acid or is deteriorated by other gas admixtures, which causes a discoloration of the lime water, which is colored violet with phenolphthalein etc. cause.

Now, since the thread α in FIG. 1 uniformly upward in FIG. 2 smoothly moved downward, so a certain length of yarn always remains exposed to be tested air, etc. to a certain time, so the thread is α always in only one respective length colored purple, which corresponds to the respective carbon dioxide content or the respective degree of deterioration of the air to be tested, etc., so that the test result is easily determined by the scale h .

The correct scale division is selected by exposing the apparatus to the atmospheric outside air for a sufficiently long time and then bringing the thread to the scale whose total length corresponds to the length of the violet color of the thread α that remains visible in the outside air. It then corresponds to z. B. the 7th graduation mark of the purest air, the zero mark of the scale h, however, spoiled air.

Gas types other than air are tested in an analogous manner.

When apparatus according to Fig. 6, the two liquid reagents mix at the intersection or point of contact m both. Threads α and b, so that each thread takes on the purple color. The latter also takes place in the thread δ of the apparatus according to FIGS. 1 to 5, but only to such an iao small extent that this remains without any significant influence on the test.

since the dry thread α sucks the lime water etc. from the thread b very vigorously.

The apparatus is shown here only as an example and can also be any other Embodiments obtained, in particular the individual parts shown can be reciprocal Find use or be replaced by other equivalent means. Furthermore, several parts of a roughly collapsed single thread serve as individual examination threads.

Claims (6)

Patent Claims: i. Air and gas detectors acting by changing the color of one or more reagents applied to a thread or the like, characterized in that two or more threads or cords or ribbons or the like (a, b), each carrying or containing a reagent , are brought into contact with each other in any way so that the reagents of both threads come into intimate contact with one another for the purpose of uniform connection or mixing of the reagents or uniform application of a reagent to one (or more) Examination thread is effected by means of 'the other thread. 2. Embodiment of the air and gas tester according to claim 1, characterized in that the two reagent carriers (a, b) are brought into contact with one another in that they cross one another. 3. Embodiment of the air and gas tester according to claim 1, characterized in that the two reagent carriers (a, b) are brought into contact with one another in that they meet in a track, a roller or the like. 4. embodiment of the air and gas tester according to claim 1, characterized in that the one test thread (a) contains a dry reagent, the other thread (b) but a liquid reagent or only water for moistening that test thread (a) . 5. embodiment of the air and gas tester according to claim 1, characterized in that both threads (a, b) each contain a liquid reagent (Fig. 6). 6. embodiment of the air and gas tester according to claim 1, characterized in that the winding of the threads (a, b) after their use by an on the winding rollers (a ² , b ² ) effective endless friction cord (i) (o .) he follows. 1 sheet of drawings.