Evening star., 1914-04-26
EXHIBIT Of ELECTRICAL
MACHINERY IS FEATURE
Meeting of American Institute of
Electrical Engineers
Closes.
Display of Portable Wireless Tele-
phone Outfits Attracts Much
Attention.

What is said to be the finest and most
complete exhibit of electrical machinery
and appliances ever brought together in
the United States was the feature of the
meeting of the American Institute of
Electrical Engineers at the bureau of
standards Friday and yesterday. The ex-
and fourth floors of the new electrical
laboratory building. with an overflow on
the second floor.
Included in the exhibit was practically
every device used in the field of electrical
experiment. testing and development
Pieces of mechanism. the names of which
were absolutely unintelligible to the lay
man. and the uses of which are unknown
save to the highly trained expert, were
shown alongside of various types of in
candescent lamps: while every sort of
meter ever invented for use in connec-
ton with electricity was included in the
display.
OF particular interest was the display
of portable wireless telegraph and tele
designed by the War Department or the
Navy Department and are built to be
packed up and carried in the field on
muleback.
Wireless Phone . Feature.
a wireless telephone outfit which is
said to have been tested with absolutely
satisfactory results over a sending and
receiving distance of JOO miles attracted
much attention. This device, it was
stated. has been adopted for use by one
of the European powers, and the maker
of the device has offered it to the United
States government for use in the event
OF actual field operations in Mexico.
A display of radium. radium salts and
radioactive substances was another in
terestinS feature of the big exhibit. This
display. located in a dark room from
which every ray of natural or artificial
light was excluded contained $3O,00,J
worth of radium. Exhibitions of the
emanations of radium were given, dur
ing which the mysterious element, con-
cealed in a metal box. covered with an
inch-thick sheet of lead on the top of
which was placed stone slab an inch
! or more thick, manifested its peculiar
greenish glow through these substances.
A new form of stereopticon, using a
peculiar type of small. but extremely
high-powered incandescent lamp. oper-
ated automatically. The slides. all
| loaded in sort Of magazine. replaced
each other automatically, the light
switching off for an instant and leaving
the screen dark, then switching or
again and showing new picture.
Electrical Furnaces on View.
Electrical furnaces capable of gener-
ating a degree of heat sufficient to fuse
| or melt the most refractory metals; de-
vices for purifying water by means OF
| ultraviolet rays; X-ray machines and
! generators of new types, etc. were in
| Guided in the exhibit, which closed last
| night.
| The meeting of the American Institute
OF Electrical Engineers was held in CO.
operation with the American Physical
Society. Fridays program included the
presentation of number of papers on
technical subjects, the afternoon being
devoted to luncheon at the bureau
Of standards, where all sessions were
held. and inspection of the exhibit and the
bureau itself. Papers presented at the
evening session Friday were: "Solenoids, =
by c. r. Tnderhill: Some Investiga ton
OF Lighting Protection for Buildings" by
l.. A. DeBois, and Some Simple Ex-
amples of Transmission Line Surges." by
w. S. Franklin
Yesterday afternoons session was a
joint meeting of the electrical engineers
! and the American Physical Society. Tive
papers were read, on "A Milliampere
Current Transformer" by Edward Ben
nett. and Theory of the Corona" 10y
Bergen Davis.