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چکیده
Twenty new cells have been purchased, in conformity to recent action of the State Board, as an addition to the storage battery plant of this department. The cells have a capacity of forty ampere-hours. T h e r e are now available for direct current work, voltages of 40, 72, n o and 500 volts respectively. This will largely increase the range of experimental work which can be done by electrical classes. A pendulum apparatus has been completed with which tests of the insulation resistances of commercial cables can be made and the value of various materials for insulation purposes compared. A conductivity bridge has been recently constructed in the department shop for determining the relative values of different sorts of wire for electric power transmission and for construction of electric machinery.
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On the Structure of Semi-normal Operators
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