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Caption: Booklet - Engineering Experiment Station and Industry (1909)
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24 Breckenridge—Engineering Experiment Station Breckenridge—Engineering Experiment Station 25 In the Electrical Laboratory—-(Fig. 24). i. Three rotary converters furnishing current based on n o and 550 volts D. C. 2. A 1 5 . H . P . variable speed Westinghouse D., C. interpole motor giving a speed range of 300 to 1,200 rev. per min. 3. A 7J/2 kw. inductor alternator which can be run at frequencies up to 150 cycles. 3 meter and a 5 meter photometer bar, photometers of various kinds, standard lamps, a Sharp Millar illuminometer and a room equipped for the study of problems in illumination. 12. Two experimental telephone switchboards and a supply of both manual and automatic telephone apparatus. 13. A large equipment in electrical measuring instruments of various types, both A. C. and D. C., among which is a series of electrostatic voltmeters measuring up to 1,800 volts. 14. A fine set of standard electrical measuring instruments including a Weston D. C. laboratory standard voltmeter and a millivoltmeter, Westinghouse precision voltmeter, ammeter and wattmeter and a Leeds Northrup potentiometer. There are also switchboards for rapid handling of apparatus, numerous lamp banks for resistance, oscillographs, inductances, condensers, a mercury arc rectifier, arc lamps of many types, racks for life tests of, incandescent lamps and much other smaller apparatus of value in research work. The department maintains a well equipped machine shop with an expert mechanic in charge so that special apparatus can be made under the direction of the experimenter on short notice. The Cement Laboratory. This laboratory is equipped with briquette molds, molding machines, testing machines, etc., necessary in testing hydraulic cement, and in making investigations as to the effect of different materials and methods of manipulation upon the strength of mortars and concrete. The Road-Materials Laboratory—(Fig. 25). The Civil'Engineering department in its Road-Materials Laboratory is equipped with apparatus for testing materials for road and pavement construction as follows: FIG 24. MAIN TESTING FLOOR OF T H E ELECTRICAL LABORATORY 4. Two General Electric stationary armature alternators designed to operate as either two or three phase generators or motors and at a variety of voltages. 5. A 45 kw. motor generator set, used to furnish a constant. voltage either A. C. or D. C. for experimental purposes. 6. Several induction motors ranging from 2 to 5 H.P., of one, two, and three phases and various voltages. 7. A number of n o and 220 volt D. C. motors of from 10-15 H.P. and a variety of D. C. generators of various makes and ranging up to 10 kw. in capacity. 8. A single phase, variable speed, 220 volt, 10 H.P., A. C. motor. 9. A 60 cell Gould storage battery of 240 ampere-hours capacity with a switch board so arranged that all voltages between 2 and 120 can be obtained; also current up to 100 amperes at full voltage with greatly increased current at lower voltage. 10. A large number of transformers of various capacities, voltages and transformation ratios, including a small 10,000 volt and a 10 kw. 100,000 volt testing transformer. 11. A photometry and illumination laboratory, provided with a FIG. 2 5 . ROAD MATERIALS TESTING LABORATORY
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