Evening star., 1928-08-12
Special Dispatch 10 The S'ar.

] q
Modem science paid homage to The
/ memory of Thomas Jefferson here last
I evening during the second session ot the
Institute Of Public Affairs at the Uni
yerSlty of Virginia when the 360 000.-
000-candiepowcr Searchlighl flashed it's
beam from the roof of the Monticello
Hotel 10 the McIntire Stadium miles
away, where g new photo-clecjriC cell a
/ recent Westinghouse development, was
hidden
In few seconds this huge beam
found the tiny. li2ht-SC0S!tlvC device
! which IS no larger than an ordinary ra-
dl0 tube and whose energy Is less than
one -billIonth of 3 watt This photo
electric cell Immediately set of a red
aerial bomb as q tribute 70 Thomas Jef-
fcrson. author O. the Declaration of
independence. and siren announced
the year RS 1875
Ten minutes later another fash from
he gigantic hight caused tho ph0lo-2leC-
trlc cell 10 explode White bomb in rec
oenition of Thomas jefferson. the au-
thcT Of the Virginia statute tOr religious
freedom with the siren announcing the
year as 1886, when this Law was enacted
Founder of Schools
A few minutes later another bomb fur
niShed a blue effect honorlng Thomas
Jefferson. the father Of The University
Of Virginia. ana the champion of uni
yerSal eQucaCon which was the ioun-
dation ol our public school system The
siren sounded again but this time II
announced the wear as 1928 when the
University OF Virginia was opened.
This same demonstration was repeat
ed an hour later at NoticCilo. the home
Thomas jefferson. 3 miles away from
the Monticello Hotel
This tribute 10 Thomas jefferson
took place at a Joint meeting Of the
Institute Of Public Affairs and the
Thomas Jefferson Centennial Commis
sion of The United tSateS. and the DEM
onstration was witnessed by thousands
Of guests Of both organizations.
DR. Charles Gilmore Maphls dean of
the Summer session Of the University
Of Virginia and who is also a director
Of the Institute Of Public Affairs. pre-
sided
Technical details Of this demonStra-
tion were worked out by the Virginia
Public Service Co. the Sperry Gyro-
scope Co. the Westinghouse Lamp Co.
and the Westinghouse Electric & Man
utacturing Co.
Like Radio Tube.
The photo-electric cell at the Nc
Tntire Stadium and the Thomas Jeher-
son home at Monticello is q develop
ment of DR. Y. ZWo~kin Of the West
inghouSe research laboratory at East
Pittsburgh Pa This cell closely re-
sembles in exterior appearance an ordi-
nary radio tube being similar in shape
and provided with the conventional
type of radio tube base The cell is
also provided With an amplifier unit as
3 means Of giving the very minute
photo-cen currents one stage Of vac
uum tube amplification. thereby yield
ing currents of the order of several
milliamperes while the photo-cell cur
rents may be of the order OF several
hundredths Of a microampere
Under the conditions prevailing at
Charlottesville the energy in the imme-
date photo-cell circuit was OF the order
Of one microwatt, or e-billionth of a
watt. To give some idea OF the feeble
current going through this tube it is
estimated that II a hosting crane were
supplied with the same energy it would
take approximately 80 years 10 lift a
75-pound weight 10 feet. even ii the
crane were 100 per cent eficient
Compared to Sun.
Some idea of this enormous search
light may be gained from the fact that
the brilliancy Of the iight-producing
crater is equivalent TO the suns inten-
sity at high noon This crater is the
hottest spot on earth when the search
light is operating. Engineers say that
200 Of these lights equal a star of the
fifth magnitude
The scientific and patriotic tribute TO
Thomas Jefferson was preceded by
reception TO the officers and members
Of the Institute Of Public Affairs and
specially invited guests at Monticello
the home Of Thomas Jefferson. which
is now a patriotic shrine The recep-
ton was rendered by the Thomas JEFF
ferSon Centennial Commission OF the
United States, appointed under an act
of Congress. the members OF which
are: President Coolidge, Vice President
Dawes, Speaker Of the House Long
worth, Senator Mclean Of Connecticut
Senator Robinson Of Arkansas. Senator
Fess Of Ohio, Senator Copeland of New
York. Representative Garrett of Ten
nessee, Representative Tilson OF Con-
necticut, Representative Moore Of Vir-
ginla, Representative Bacon OF New
York. Charles Francis Adams. Dr. Ed
win A. Alderman Claude G. Bowers,