Buffalo medical journal . of Zurich, a decided step wasmade in advance. Althoughhe employed the same prin-ciples in about the same way,the gain was by the largerscale adopted. His first mag-net was described in the Bei-trage fur Aiigenheilkunde, butthe one I refer to has one ortwo further improvements onhis model. The core of this magnetis composed of soft iron ofabout twenty-four and one-fourth inches long, each endtapering to a point. Aroundthis central core there iswound 5,387 feet of soft wire, arranged in the form of two core with the wire weighs 226 pounds. This is mounted on
Buffalo medical journal . of Zurich, a decided step wasmade in advance. Althoughhe employed the same prin-ciples in about the same way,the gain was by the largerscale adopted. His first mag-net was described in the Bei-trage fur Aiigenheilkunde, butthe one I refer to has one ortwo further improvements onhis model. The core of this magnetis composed of soft iron ofabout twenty-four and one-fourth inches long, each endtapering to a point. Aroundthis central core there iswound 5,387 feet of soft wire, arranged in the form of two core with the wire weighs 226 pounds. This is mounted on aheavy stand of oak, about five feet high. Unlike the original modelalso it is arranged with a swivel movement, permitting an adjustmentof the point at any position. The current is supplied by the powerline of the General Electric Company, which furnishes 500 volts,though it is necessary to reduce this to a pressure of 60 volts and avolume of eight amperes. The very great power of this instrument can be estimated by a few. THE HAAB MA(iNET HOWE : THE HAAB MAGNET. 745 simple experiments. If one holds out a small bunch of keys a shortdistance away, they apparently become animate and stand up, toreach out toward the magnet. If a watch be brought within a few feetof the machine, it at once becomes magnetised and must be passedthrough a tedious process of demagnetisation before it will keep timeagain. The force of the magnet is more exactly shown by the experi-ments made by Haab. Ke suspended a piece of iron, weighing onegram in front of the magnet by means of a thread. Another threadwas attached to this gram of iron, this second thread running a shortdistance horizontally turned over a roller, and was attached below toa small disc, on which weights could be placed. It was thus possibleto measure exactly the attractive force of the magnet, upon the gramof iron, and be found that when this gram of iron was at a distanceof five millimeters from the magnet, With a current of amp. t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmedicine, bookyear190
