Arizona silver belt., 1895-04-27
WEIGHT or THE WORLD.
How It Is Calculated by an Eng
 fish Professor.
Figures Which Are BewiIdcring in Thcir Immonaity The Soi.nttnc Gontls- man Is Doubtiess safe from
 Contradiction.

ing speeds a,ong their orbits he con struc,vd a formula which would ex- plain these phenomena, says the Lon don Graphic. He laid it down as law that the force with which the earth at tracts the app;e or the apple the earth, or the planets one another is equal to the mass of the one multiplied by the mass of the other, and divided by the square of the d,s.ance between them the whole mut,p. led by constant ca,,rd c. C is the Newtouian constant of gravtat.on IL is of all the con stauts the most important to physical sciruce; it is a. constant for the more accurate determination ot which Prof. Buys, who icctufrd upon it recently at the lun,ion institute has been wiling Co spend i've years of the most arduous ant m:nute observation. ltis one hum dred years siuce Rev. MT. Mitchell first devsrd an iustrument by which it woU.d be poNS, be to obtain, by actual obsrryat,uu the attraction which two bod,cs have for one another.
 Cayend sh improved upon Mitchells observations, Coruu earned it on. Prof, Boys has, 50 tO simalk, carried it two decaal p,atcs fur;aer, Now let us cons '.er !ow it wou.d be possible to as- cer'" n, by observation, the attraction winch two bodies have for one an- other, If Prof ltuys were to hang Q cou9,c of G:;ypound lra' ha',s by two filters he wuu.d eud it as iuIr,se. bie to meAswre the inc..uatiun of the two fbr~s 10 one auotner as to weigh Suu"ram. liut there is a possible way oi TrNsGr;Hr the attraction, and Prof. Boys has u.A'e it more p,,,.ble-or, let us say more pract,ral- by the employ men; Of guartz hbers to suspend some of the bn.s he uses. He uses in all four ba..s-tNo god ba..s a quarter of an inch in diameter wc,ea. ug forty or fifty grams and two lead balls, four and haf inches in diameter, and we'sh:ng each siN,rrn pounds
 Now, suppose thr,e four balls In their hcSt position suspended in one p,auc. The two htt,c gold ba.,s are su,arudvd by quartz Ebcr5 on either side ui au oh,ouR mirror, to which they are atlachrd. lf any. .foree were to pu. one god bal '.,t,e way forward, alr! a. tar same i.nc to pail the other nt,.r god aa,l i.t.,G way back, it is oOv.a.,s that twsst, an osc..a;iou, wuua be iiaarted to the tiny mirror Nuw su h-aUl..u,iy is th.s mirror with it's guai Im.,s, hung on it's tube. that force equal to the hundred mi,8outh part of a grain will set it swinging. With this drsrce of seusitivencss at- tained, we btg,n to get near some mcaU> pf u,eaNGgHE influences upon F Tue iE;,u~uce we caE measure is that of the two lead bas,a. We imagined them 10 be, in the first instance, in the same perpendicular pane as the little gold baas. Suppose we move them coutemp1raucoEs.y and cocqually, so that Jne lead bal moves in front of one god haa and the other lead bal moves, exactly in the same way, behind the other god bal. lf the hanging of the mirror and its god ba.s is de.iate cRou-h jl is uhviops then that the force cxcr.,al by the attraction between the god uas,s and thc lead ba,,s will gigo the m.rrur to whici, t:,c god ba"s are Gttar3rd litl,e twist snd wia sct it osc. at.ng. The instrument is cel- icate enough
 Seated cgity feet away the observer can t.mc it, lie therefore can measure the .nrre which the lead ha,.s and the god bn.,s exert up"n one another; he can mraSurc the distance which the ba"s are apart; he can measure the ba.s, Therefore lBuw'ng tine force, the Wa>~,s and -e dss,ance between them, he can determine tae great con. staut q, and, knowing C, he can deter m.ur the specific g-agity of the earth; he can Gad it's wrEit, Prof Boys, after years of experiment., has found the specific gravity of the earth to be 5.5a7 lIr.ure this t:ue we were con tent to regard it as 55. He has taken five years or more Co establish beyond controversy these other two der.mals Peure with taste for large figures this lS @ bass, the Wr.rat Of the world may be taken as 5,ss2 ,00o, DOC, ,Oo0, GOO OgJ.UuU tons,
 That. as far as the present writer is conccrurd, is the most lurid eXplana- tion wiach can be gwen of Prof liuys' method Hut it has left untold the cx- traorIuary minutrurss of the observa. tions and Che acnstiyeuess of his in- strumeuts. The instrument which con tains the system of gold and lend ba,is is put in the corner of an underground crypt in oxford There is too much trcinor of the earth in London. 1t is boxed mp in thick octaguual wooden box. It is separated from the observer by series of felt curtains, He sits eighty feet away and examines it's movements by means of telescope through sits in the felt curtains and in the wooden box and in the metal tubes holding the gold ball system.
 The mirror reflects nine-foot scale with 5000 diH 5ious placed behind the observers hoad. In order to avoid ere ating currents of air, Prof Boys has the scale illuminated only by Q little travelling lamp In order to avoid trcmors of earth he works at dead of night, for a train 6hunting a mile away will move that tiny mirror; and once an earthquake in Transylyania, on the other side of Europe, was marked by it. And then as to the measurements the distance of the lead balls from one another is calculated by micro meter and microscope to tho 3O9th part Of an inch, the distance of the gold ball quartz libers in the 10 ,G0Oth part of an inch, and force equal to the nIipionth of a grain would be sufficient to send the reflection of the mirror right off the scale. FOUL AIR AS A GERM GARDEN. Good Sanitation Prime Necessity as D
 Dcfensc Against D.scaso Germs