File:Change of electrical resistance in a magnetic field - with experiments on the change of resistance of electrolytes (1908) (14596415109).jpg

Identifier: changeofelectric00stif (find matches)
Title: Change of electrical resistance in a magnetic field : with experiments on the change of resistance of electrolytes
Year: 1908 (1900s)
Authors: Stifler, William Warren, 1883-1954
Subjects: Magnetic fields Electric resistance Electrolytes Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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de Khotinsky1s cement,except the outside grooves on one face. These were left clear afew millimeters farther at the upper end. A hole about 3 mm. indiameter was drilled in each edge to communicate with the upper endof each of these longer grooves. Pieces of glass tubing of about5.5 mm. inside diameter were bent into the shape of an L. Thesewere to receive the electrodes. The vertical arm was about 35 mm.long. The horizontal part was drawn out so as to fit snugly intothe holes drilled in the edge of the cell, and was about 15 mm.long.The tubes were cemented firmly in place with de Khotinsky s cement,A piece of cover glass was cemented to. each face of the cell to com-plete it. The cell was mounted on a stiff wire in the middle ofa rectangular base. A mercury cup was mounted at each end. Plat-inum electrodes, 19 mm. x 4 mm. x 0.03 mm., provided with rubbercaps to fit the ends of the glass tubes, made connections with themercury cups. The whole arrangement is shown in Figures 6 and 7. A
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- 25 - The finished cells were about 10 mm. thick. These cells were easilyfilled with the electrolyte by attaching one tube to an aspiratorand dipping the other into the liquid. An aperiodic DArsonval galvanometer of the Ayrton-Jffathertype, made by Faul, was used throughout the investigation. Itsresistance was 207 ohms. A current of 1.58 x 10~8 amperes causeda deflection of 1 mm. on a scale at a distance of 115 cm. The gal-vanometer was mounted on a bracket attached to an inside stone wall.It was entirely free from mechanical jars. Experiment showed thatthe electromagnet did not affect the galvanometer. The resistance boxes used were the best grade manufactur-ed by Hartmann and Eraun. It was decided to use a direct current method for measur-ing the resistance as it was thought that the use of an alternatingcurrent might hide the effect sought. Toward the last of the in-vestigation an attempt was made to check some of the results bymeans of an alternating current and telephone. This p

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