. Construction and test of a rotary transformer for direct current . placedIn the field circuit, line circuit, and load were connected across the supply and sec-ondary terminals, an alternating current voltmeterwas connected across the brushes (Id, b) to give thedifferente of potential between them, which v;as re-sponsible for the short circuited currenx. A magnetoand voltmeter was calibrated to give the speed. Themagneto being belt-driven from the armatiire shaft*For starting a carbon pile rheostat was inserted inthe supply line. This was parallelled by a shortcircuiting sw
. Construction and test of a rotary transformer for direct current . placedIn the field circuit, line circuit, and load were connected across the supply and sec-ondary terminals, an alternating current voltmeterwas connected across the brushes (Id, b) to give thedifferente of potential between them, which v;as re-sponsible for the short circuited currenx. A magnetoand voltmeter was calibrated to give the speed. Themagneto being belt-driven from the armatiire shaft*For starting a carbon pile rheostat was inserted inthe supply line. This was parallelled by a shortcircuiting switch which was closed when the machinewas up to speed* ;:>uitable protective apparatus wasinstalled in the linOi^ the load was taken up by car-bon piles on low voltage, and lamp racks in serieson high. All instruments were calibrated before andafter the test. Curves for these are included inthis report. Runs were taken for both full and half compound-ing at potentials varying from thirty-three to eightyvolts on the secondary side, and for full compounding -17-. 60 80 100 1«0 140Weston
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