The Alaska citizen., 1913-02-24

accuracy nan has yet been posst''- rrrnarasous are being made in. southern California 10 diseov - whether or ro' 1he sun is eettins cold A now lor1foo vertical tHA s.ore Is bem- erected on top of 'A. Smithsonian lr,Hta.jon's ohser-at'"s on Nj, Wilson and through ii as ,raHei.ars aH' seek fo find 'a whether fhery ht~ been any apprer.a he decrease in thr size of the s1. Aaa r,e 0hermametrie instrume. mere hncly coustrnstei than any 'o present use. Will ba ,alled into SO ,j.r fo measura the suns ae'da. heat Both these processes nr. n,rded in ascertaIniug whether OF uet ihe sun ss cooling of
 Although the possible cooling If the sun is question in *hich scientists are greatly Interested. os ,feHomers are quick 10 explain tHa, their inquiries have no "rraetira' significance whatever. The sun m ra cooling off il may be gettiua smaller il may have soHdidch lf ,he center. 1t may be- throwing of great deal ltss neat than any 7re ,ieus records have shown. But ar rb5s e1a ma6e ae possible dlnere..C. to 'Ho sarlh and its mhabifan's: # cannot exercise the =ii-h'est i" ruance upou our climatic conditions We shall continue to liye througE srorchiuE summers and summers c5 rain. and seorehih4 summers aa;'r until geologic ages haze come a. .ore. Auf probably, in the cou st of nine or len million years the r'. "iA haze become cold and de q aud the earth will arow furil tor
 ..taa whole thing js merely in H.. fiar ot scientific inyesti4ation." sata l4r IasoGs Hu'heriora Professor ol
 srauomy al Columbia. and ft ,s t& Ho means | neW experiment Nh have been working Tor year.; ii
 measuring tae heal Of the suu aul the proportion ot Is radio-ener that reaches the earth Il has been assumed. as result ef experImons aeH theofeti, calculation. that Ill eun sill one das Ieein-or has al lealy begun to lose very gra aiuari, j.s heat There is also an observa tors ill Algeria where highly perfect et instruments. for measurias jns .aa.s rays ar. m constant use. Th,ss instruments that are to be used dn Ger pr Ahbot's direction in GalisHr nta a'r simply planned aE finer aaf mofe minute ahle to take more ac
 uraJe measurements and SO tc record stight differences. Whet"rI or not the sun is cooling in any par the same amount of heat reaches Gs
 aThe foriy-foot tower referred te i- the dispatches from Pasadena Prot Jacoby went on, is not Q tower at all but an immense ,ts scope. Il differs rom most other telescopes iu that il is quite yerticai | is furnished @ith q great ref c or. Is purpose is 10 register the size of the sun b what we call an 2ular measurements"
 Prof. Jacoby picked up a pecci, and drew a circle on a piece ot paper From each side Of the cir cle he drew tangent. and extend >d them until they met al q point where he marked cross.
 NOW this cross" he explained is. let us say. q man on the ear:h The circle is the sun. The lines a". imaeinary lines from the man on the earth to the sun. The an",la} measurements are taken so" hs drew line from one tangent 10 tnt. other near the point where they met Now this line in this tr;a.-- gle is the angular measurement he added. If the sun is changing in size. that line must change wn9 il. IL is that line that we measlnC with the telescope. We believe tha. the sun is growing constantly small CT. But so very slow is the decrease in its size. as compared to it's entire radius. that We have never been a5Is 10 perceive the slightest difference.
 his decrease in size is closeir connected with the throwing off oi heat from the sun Prof Jacoi'. continued Scientists have known for many years that the prodigous amount of heat which the sun throws off would have caused il to cool, probably long ago. if the heat supply had not been in some way replenished. There have been soy eral more or less ingenious explana tions for the replenishment of heal. The most plausible. and the one gen erally accepted at the present time. is the theory of contraction, which was offered by the famous Germaa physicist, HelmholtZ. a little mo- than fifty years ago Helmholtzs theory is that the sun contracts slightly but constantly; it's mole cules are drawn by sravitation clos, CT together, and this impact pro duees heat again. through the trans