Untitled - eCommons@Cornell - Cornell University

SIBLEY COLLEGE. 303
The Laboratories of Electrical Engineering, including the ap
paratus of the Department of Electrical Engineering of Sibley College
and also that available in the Department of Physics, comprehend
special many collections of apparatus and equipment. In addition to
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large numbers of workings drawings of stations, plants, motor and
electrical machinery, there are extensive collections of experimental
machinery
and apparatus of research. These collections include a
great number of large and small dynamos of arc and incandescent
lighting types, including
a five hundred light and a twenty-five light
Edison, two Thomson-Houston, three Weston, a Ball, a Mather, a
Waterhouse third brush, a Gramme, a Siemens and Halske, a six
hundred and fifty light Westinghouse alternate current machine and
its complement of converters, and a Westinghouse forty arc-light
alternate with its full complement of lamps,
and a ten H.P Laval
turbine and dynamo ; a variety of motors, including two ten H.P.
automatic Sprague motors, a Brush five H.P. constant current, and a
Tesla alternate current motor. Storage batteries are of the Julien,
Gibson, Sorley,
and other "accumulator"
types; aggregating about
200 cells. There are also arc and incandescent lamps of all the various
types,
and commercial electric meters. The great tangent galvano
meter and electro-dynamometers, and the potential instrument at the
Magnetic Observatory, and the authorized copies of the British Asso
ciation standards of resistance afford every facility for making meas-
ments in absolute measure of current, E.M.F., and resistance, with
the highest attainable accuracy.
There are large numbers of ammeters, voltmeters, Wheatstone
bridges, electro-dynamometers, electric balances, long range electrom
eters, etc., many constructed here, others purchased, for general use,
and always kept in correct adjustment by comparison with the above
apparatus. Apparatus is provided for all delicate test
standardizing
ing, for the exact and study
determination of alternate current energy,
for conductivity and insulation tests, and for the determination of the
properties of the magnetic materials. Means for making quantitative
measurements are supplied through a well equipped photometer room
for the photometry of arc and incandescent lamps ; several Brackett
"
cradle " dynamometers for efficiency tests of dynamos and motors ;
a rehostat of german-silver wire, for a working resistance, with a
capacity ranging
from twenty-two hundred ohms and four amperes
to four-tenths of an ohm and three hundred amperes.