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A Valuable Invention

A Valuable Invention image
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Mr. E. J. Knowlton, one of Ann Arbor's well known citizens, has reoently secured letters patent on an invention on which he has been worMng for the past twunty years. Mr. Knowltoft. is known the world over as the manufacturcr of portable rubber bath tubs. Years ago Mr. Knowlton concei ved the idea that a substitute could be used for rubber in making1 sacks for his baths and one whioh would costmueh less and be just as durable, if not more so, than rubber itself. Some five years ago he sueceeded in compounding sueh a material and at once made a number o baths, using the substitute in place of rubber and as an experimental test he placed these bath tuba into the homes of a few well-known families in this city where, during these years, they have been in use and have stood the test with remarkabla success. In faet we found, upon examining one of these baths one day this week, that, although it had been in service for live years, it seemed fully as good as new. The compound which Mr. Knowlton has sucoeeded in making may be applied to any kind of fabric and makes the same entirely water proof and suftieiently strong to withstand great pressure. As it is only about one-half as expensive as rubber and will, we think, be found f ar more durable, its use must necessarily become very general. It can readily be substituted for in the manufacture of all kinds of water-proof goods, and this alone opens up a wide and extremely profitable field for its use. i'hen, too, it can, doubtless, be made use of in the manufacture of all kinds of hose pipe. In this latter use alone the substitution of a material costing only one-half as much as rubber would be worth an immense fortune to any company. Various samples of fabrics coated with this compuund have been submitted to Mr. Ottmar Eberbach, a well-known pharmacist, who has given the most rigid chemical tests. He gives the result of his experiment as followj : Ann Arbor, Mich., May 12, 1894. The fabrics furnished us by -Mr. E. J. Knowlton, treated by this process for makins them water proof, with request to test them, in regard to their resistance to the action of various chemical salts, particularly with view of testing lasting qualities when used for baths containing chemieal salts. Some samples were taken out of the solutions, exposed to the air for several days, and again placed in the solutions for a week. After maceration for time mentioned samples were taken, worked, wrinkled and rubbed, then dried and again worked and wrinkled. On examination the goods we found to be perfeetly sound and well coated, leaving them perfectly elastic and not in least impaired even after the lapse of several months. OTTMAR EBERBACH. Member of Michigan Board of Fharmacy. Mr. Knowlton has already secured patents on his discovery in the United States, and proceedings are in process for the same in Kngland, Germany, Austria and France. We understand that a number of capitalists have investigated the matter and made liberal offers for the patent. Mr. Knowlton, however, is in no haste to dispose of his interests in this invention, as he is fully aware of its great value.


Old News
Ann Arbor Register