Show I 1 polarized light its utility I 1 BY BF PROFESSOR PROFESS C 0 PAGE 1 I 1 when an isolated principle I 1 or truth in any branch of science science is is discovered the question is immediately asked ii of df what I 1 use ia 8 it franklin francin answered this qa question atlon for all time by asking another vii what is i s the use of a new born babel babe of what use ase or oi importance imp ortance ort anee to map man I 1 was it thit in 1810 U 11 malus discovered that the different sides of a ray of light are possessed of different 1 properties in riela relation aon t to 0 O the tha plane ot 0 its I 1 incidence a ci dence this is one on e of the most obscure of all scientific proportions and yet we wa shall soon aee how triumphantly tho t h e cavil dayi lor is silenced and how bow liberally e even v en this I 1 1 I little fountain f has poured its treasures r es into the lamp of art without entering into tho elucidation of the facts we will enumerate them theia as they I 1 I 1 occur tu to us I 1 when glass is properly annealed of a good quality it exhibits no change 0 of f c colors when examined by polarized eed light T if the glass has I 1 not been properly annealed ailine 1 I led the instantly detects th the defect by the display of 0 f colors the annealing of glass lass is is expensive an and t the e manufacturer grer often slights this part of his work glass tam fc amblers I 1 era pitchers it chers decanters tubes fe enoi well ell annealed annea ed break brea often on the slightest scratch or upon the sudden application to heat or cold glass tumblers will often crack when hen a piece of ice is ia left eft in them and frequently f break when set away by themselves owing to some slight scratch which they might have eave received a week previous following the directions laid down in treaties op polarized polarised sed light a few little I 1 plates of glass or what is better a NV nicols dolla prism sm and a piece of glass blackened on one side aide will sh shaw i athe the purchaser whether he is buying annealed I 1 gliss glass or not the nicols prism prism r or eyepiece eye piece is is a simple apparatus costine from one to ten dollars and audo ao small that ifray be carried in the vest p pocket bocket without incon vience jf if a piece of annealed glass be pi pressed essed or bent the arrangement of oj its particles part ioles becomes disturbed but t this it is disturbance does not noam manifest itself to the eye nor to the most powerful 0 fir 1 B but ut when viewed by polarized light li the internal commotion reveals itself in the most beautiful manner and while hile the pressure ciure is increasing disruption seems inevitable thol tho all the while to the naked eye po no signs sig S of fracture or change is mp apparent parent A beautiful 1 f I 1 feature inthis in this experiment t i is a that it shows exactly in what direction fm would take U ae place if the pressure were sufficiently ih creAsed taking adevai advantage etame of this property properly model bridges and other tures turea have hew eon nue BUO bitted to strain or pressure the pol ray discloses to the architect what neither the unassisted eythor eye nor calculation could ever discover the quilitz U jewelry is da determined er by I 1 I 1 light tha quality of su sugars ars an and 0 o of f ma many I 1 r articled f of commier car and I 1 of woven fabrics suspected etea of adal tera I 1 k I 1 hiob may b be po adroved add ty by polarized lighta t r you tented a piettie e ka gallery iliev you ite ale al e cheated ea ted of oad a I 1 gooel view iw of oe some pain paint t bj the strong re fleetion ution of light from i vanish any yeti yan may abia wa se lect elect a suitable p position n look at theopia the cipio j t ture I 1 lire through I 1 ey eye e pia fiand land aai te ai ig hf h f Is at 0 o and androu conj i have havea a good bodi position tion afif anywhere where it lisA is tha hIJ 1 same when ape cular intorf interfere ere sight in viewing tir 0 or arany diak iii t oba objects e e t s I 1 I 1 t i L ua aej an 1 11 not 1 I least east ih alie martinei ma faiai iner tinei often of tin dei tat eyan at i a ret distance th ae rhoal water or sunken i eglis bichi b vaine 9 jat 6 iho file water P I 1 b but af it if the iiii son j jj is shining shi and ft th I 1 I 1 I 1 reflection aror from ace i q waed f did him n cad 69 ae not jt enable uin inq 44 and ava even 41 a riet reader rep 1 4 der 6 t OX anoh h wn 10 1 ai i a t b 1 8 slightly abea I 1 I 1 water r w being lable alele t to aee iti I 1 WO 1 p bece extinguishes tin I 1 8 au all this re a afe 5 a and gives atvas h him im a clear view of what is 8 before 8 fore him im to hunters and anglers this his property of th ap e te eye I 1 piece is often aten very valuable 1 I 1 kofl 0 F for or true splendor and yari variety ety the phen 4 yn I 1 I 1 r 1 il j a I 1 I 1 ena 0 of f polarized light surpass all others in in the whole range of science W without shout anum enu nier elan aring au all the advantages re salting ting from the tha discovery of mains we think we have bave sn an r bof of what use is it on t this his subject to his satisfaction U S magazine |