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Show FIRED BULLETS NOWSURELY NOW NOWSURELY NOWSURELY SURELY IDENTIFIED IDENTIFIEDNew IDENTIFIEDNew New Instruments Perfected Perfectedat at Northwestern "U U " . " , E\ E Es Evanston Eanston \ anston IIITwo IllTwo Ill III -Two Two - Two new instru instruments instruments instruments ments which wluch improve lmprovc and facilitateexisting facilitate facilitateeXIstmg facilitateexisting eXIstmg existing methods of identifying IdentIfymg fired firedbullets firedbullets firedbullets bullets have been constructed constructe m in mI inNorthwestern inNorthwestern I Northwestern University's Universitys ' ' SClent ScientificCrone Scientific lc lcCrlme ' Crime Crlme Crone Detection laboratory by byCharles byCharles byCharles Charles M W Wilson son , research engi engl- engl engi- . - neer and assistant professor of police po- po pollce po police - lice llce scienceDetails SClenceDctculs science SClence scienceDetails Details Dctculs : of the instruments wluch which wluchembody whichembody whichembody embody new ncw principles prmciples m in the SCl- SCl sci- sci SClence science sci science - ence of ballistics ball1stlcs are announced in inthe inthe inthe the Journal of Criminal Cnmmal Law and andCrlmmology andCriminology andCriminology Crlmmology Criminology , a university publica pubhca- pubhca pubhcatIon publication - tion tionWith With the aid ald of the new devIces devicescrime , cnme crime foes vv \ will \ 111 ill be able to obtain obtam fac fac- factual factual factual - tual evidence evdence ] from a fired bullet Wlth with WlthvIrtually withvirtually withvirtually vIrtually the same degree dcgree of accuracy accu accu- accuracy accuracy - racy which whlch the bertillon bertllIon expert cxp'rt cxprt ( ' ex- ex exacts exacts ex exacts - acts from fingerprint fingerprmt measurements measurementsMany measurementsMany measurementsMany Many Difficulties Drfficulhe.c Drfficulhec . ; Before . _ Methods of determining determmmg the char char- characterIstics characteristics characteristics - acteristics of a fired bullet and trac trac- tracmg tracing tracing - ing mg it back to the gun that fired It Ithave ithave ithave have heretofore been confronted confrontedWIth confrontedwith confrontedwith WIth numerous difficulties dlfflcu1bes and sub sub- subJect subject subject - ject to errorIt errorIt error errorIt It is to overcome these handlcaps handicaps handlcapsthat handicapsthat handicapsthat that the Northwestern uruversity university uruversitysClentlst universityscientist universityscientist sClentlst scientist has constructed the instru mstru- mstru instru- mstruments instruments instruments - ments , , one called a variable stage stagemIcrometer stagemicrometer stagemicrometer mIcrometer and the other an incli mch- mch incli- inclinometer mchnometer inclinometer - nometer . The micrometer is a delicate del1cate m- m in- in mstrument instnunent in instrument - strument stnunent which measures the wIdth wIdthof widthof widthof of land and groove impressions on onfired onfired onfired fired bullets to an accuracy of five fiveten fiveten fiveten ten thousandths of an inch mch It re- re reduces reduces re reduces - duces the 'e e ' possibility posslblhty of error of ofmeasurement ofmeasurement ofmeasurement measurement of certa certain n character- character characteristIcs characteristics character.istics characteristics . - istIcs of fired bullets , By means of this instrument mstrument the thetollowmg thefollowing thefollowing tollowmg following characteristics of a firedbullet fired firedbullet firedbullet bullet can be obtained obtamed . , maximum maximumdiameter maximumdiameter maximumdiameter diameter of the bullet bu1let and ahd width Wldth ofland of ofland ofland land and groove impressions lmpreSS10ni The Themstrument Theinstrument Theinttrument mstrument instrument is so constructed that 1t it itcan 1tcan itcan can be clamped into mto position poEitlbn on the thestage thestage thestage stage of a mlcroscop microscope microscope microscopeErrors ) microscopeErrors s , ; Errors Are R Reduced duUd . The inclinometer mchnometer mcciometer , like Wee its lts compan compan- companion companIon companion - ion piece , reduces err errdrs errors ra of meas meas- measurements measurements measurements - urements made m in the examinationof examinaUonof examinaUon examination of fired bullets It reveals revea1s the "rateof "rate rate "rateof "rateof rateof " of twist " of the gun barrel from fromwhence fromwhence fromwhence whence a bullet came By TBy By twittinfa tWlstlnga twistinga tWlstlng twisting a bullet slowly around under the themagruymg themagnifying themagnifying magruymg magnifying ! lens th this . l information informationcan informationcan ormabon ormaboncan can be obtamedThis obtainedThis obtained obtamed obtainedThis This is an extremely lmportant important lmportantphase importantphase importantphase phase of ballistics since smce varlOUS various varlOUSmakes variousmakes variousmakes makes of firearms employ dlfferent different dlfferentrlfung differentrifling differentrifling rlfung rifling The * ' twist tWlst " in m some barrels bar bar- barrels barrels - rels makes a complete- complete completeJ complete-'turn complete 'turn turn completeurn - - J " ' furn urn m in 16 16mches 16inches 16inches mches inches , others require reqwre 183a IS3 183 mchesThe inchesThe inches mches ; The instrument consists of ot a spe- spe specIal special spe special - cial compound microscope eqwpped equipped eqwppedwIth equippedwith equippedwith wIth special stage so arranged that thatelements thatelements thatelements elements of lateral dIsplacement displacementand and rotation may be accur accurately accuratelymeasured accuratelymeasured accuratelymeasuredNew tely telymeasured measured measuredNew New principles prmclples embodied embod1ed m in the theWIlson theWilson theWilson WIlson inclinometer Inclmometer dispense WIth WIthtngmometnc withtriginometric tngmometnc triginometric computations reqwred required requiredm reqwredm requiredin m in existing eXlstmg methods The determInatIon determination determi- determi determijnation - jnation natIon of the angle of twist is thusreduced thus thusreduced thusreduced reduced to a simple slmple arIthmetIcal arIthmetIcalproblem arithmeticalproblem arithmeticalproblem problem which can be solved by bymere bymere bymere mere inspection mspectlOn of the rotatIonal rotatIonaland rotationaland rotationaland and lateral displacements so meastired meas meas- measured measured - ured tired uredA A smgleertebra single smgle \ vertebra \ertebra ertebra ofhat of \ what \\hat hat chat \ may maybe maybe mayj mayI be the largest fossil snake in m Amerlea America Amer- Amer Amerlea - ' icaas lea ica was \as as vvas \ , found at Belvedere Beach BeachIVa , , Va , , by Dr W G Lynn Limn L 'I1n I1n ' of Johns JohnsHopkms JohnsHopkins Johnsj Hopkins Hopkms UniversityLeaf University Umverslty ' Leaf insects msects \ which \ hlch thrive thne thnve thn\ thn \ e on theguava the theguaa theiguava gua\a gua a guava \ tree , , numic lIUmlC mimic the leaves so soclosely soclosely soclosely closely that they change color as asthe asjthe the season ad\ances-flom ad ances flom advances-from advances from advances \ - - fiom brilhant brilliant brilhantred brilliantred brilliantj red to green and then to goldenbrown golden goldenbrown goldenbrown goldenbrownPeople brown brownPeople People of the United Umted States pay paymore paymore more in federal , state and localta'Ces local localtaxes ' then they do for living ex- ex expenses expenes ex-1 ex 1 - penses penes , , that is , food , , rent and andclothmg andclothing andI clothing clothmg |