Excerpt from In Senate: Journal of Proceedings of the Thirty-Third Annual Session of the Wisconsin Legislature, 1880
We have experimented considerably with what are known as closed testers. One of these, known as Foster's automatic test er, is legalized under the inspection laws of Ohio. It is con structed with a a vapor chamber above the oil-cup, upon which a cover is closely soldered; in the cover there are two Openings, one of which admits the passage of the thermometer and also allows air to enter and mingle with the Oil vapors. In the other Opening, which is surrounded by a short chimney, a small taper is kept con stantly burning; at the point where these vapors form an explosive mixture with the air entering as before described, the mixture ex plodes with, an audible puff, at the same time extinguishing the taper. Of the merits of this instrument we are not prepared to speak. In our experiments it has not, in different series of tests made with Oil from the same can and conducted with the greatest care, given uniform results. Possibly this may be due to some nu discovered defect in the articular instrument that we used, though it was received from the ands of the manufacturers direct.
There are yet other forms of testers, but the one which, of all others, we have found most satisfactory in every respect, giving in a series of experiments such as that above described, the most uniform results, and very closely approximating the results obtained by the British tester, is the instrument devised by the Michigan State Board of Health, and now legalized by the oil inspection laws of that state. An examination of this instrument will show that it approximates very closely, when in use, to the conditions existing in a common bracket lamp partly emptied by actual use; indeed, such a lamp (one having two openings in the top) may be very sat isfactorily substituted for the Oil cup in the tester in question, and this has been repeatedly done by Dr. Baker, in his experiments. The vapor-chamber of this instrument has a cover which may be easily removed, so that it can be used if desired in making either the ﬂash or the fire test.
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