Evening star., 1949-04-15
SpIit-Seeond Accuracy
In World Time Souoh,
British Asronosnrr Rerosts @- Sr,S,
In Lecture at Srnsthsor,.s

werid tszss accurate 10 t-,s -
thosasarcta rt a seeono . a.y ~ s., ,,,
90 eeisve ef astSosorssrs
A. prevent ihes~ maS ~ a. .r~~x ~ a,
mOeh As q ihca4Sancth G. Hee~~- I. :.
hours
pyosr~~s toward ta~ goa ard -s-,..t..,
~ tAe wav wrre cxseaNsr1 Al tNe A. a
Arthur leeture q. sAr SsnghNoasAr tn,i.t..
tsen last assai ~ Sar Aare}a sg~nres .'r~.,
Astronomer Royai ot oreai Rggaan ",
Gfs alreegoF et tire 0re~nwsh oss~svat~-,
}uxs OUTSIDE cs London ~aseh frpsv&~n,s ~.
Green~seh meridian sherr lhs cav star,
Even xaen the nr~ ateznag g3a<k Fevrr,v
o~vetop~d ey Ire Bureau nl Standard
9Sed there ss&H wGgl ee tsc1ass In ar~ps~t
absolutely accurate MAJ tlFss ~ sxp4a.rrs
A major atf~cGltS is IRE shgtl os sNass9srH
Of The >aleS a. mach a. ~ fe~t in are e,
rec,sen eF anoshsg N ye&T Il earHo' =.
predicted precisely fcs Anr gwen lNSsnl.
Variation. Ina~r Stsas,
T~,e variations a. icnx1taoe cpe - 80,
shift ne explained now are e~gnk cas<ferA
ev International agreement es = char nl
oaersatorses or the ssth nArallel~Ai 0aHe.
rssearg Nd Usiah calf Sardinia RUSSIAN
TN1rkes!sn and Japan ThToag hou, the Nsr
the observations continued without int.I-
Tiption
trTegularisy in the earths rate al rotation
that Is. the length ei tire dsy II IA growing
long~r at a rate az about tao lhousanetts
Of q @reend y century due 10 tire frtctionsI
dras Of the tides in shallow sess and pcsxihlv
to disturbances inside the earth THIS 10
regular process and can he predicted There
Also are changes faster slower ., different
times of about Ave thousandihs 81 q seeona
every % 10 30 wears which nov are
..ha - IA.
can be assigned.
A new kind of microscope with which eal.
oTed movies Of the fantastic wefld Of tire
inviSiele-ot germs at work and az the Jun.
gle Of human eells~was announced here
today through the American Association for
the Advancement OF Science
II is an extension of the ultra violet nsie.
roseope which IN the past few wears has
become one of the major instruments et
biological research
Black and white pictures are taken with
invisible ultraviolet rays These are much
TOO minute 10 make an impression on the
retins Of the human eye Special photo
graphic plates can be made however which
are sensitive 10 them. For extremely minute
structures they produce pictures with at
least twice the detail which ran he eh.
tanned with visible light They have partly
GoTF away with the ncfd Tor lAb0f iout pfNs-
eSses of staining tissues In order 10 identify
micro-organiSms inteSting them
In Three wav. Lengths.
Only single wave band of ultraviolet
light has been used The pictures have been
colofiess and itieieAS With the device ar.
nounced today by Dr. r. II Land and his
associates OF the research laboratory os the
Polaroid Corp at Cambridge Mas the
pictures are taken in three wase lengths
either simultaneously or one after another.
These three wave-handx essentially CORE.
spond to three invisible enlors-~or color ~n-
sations FAR beyond the reach Of man
Through a complicated system Of rltsrs
each image Is converted lneo one of the
three primary eolors~-red green and blue
The three images then are superimpos<d
upon each other,
The result, SAYS Or. Land is a color ps.e-
tograph which can be considered a. about
what the eve would see II its fetlna were
sensitive 10 the three ultraviolet banda Fss.
lures OF microscopic structures stand ou, In
sharp detail
Such picture can BE- projected On
screen for study at leisure by . class or hv
the staff of clinic II is also possibls "a
produce color movies Of the inslsihie world.
he says.