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Mees M ma) 7 hs “1 eres ib hae t 4 Lee 4) iT) h. ihe WLR. SiN. Mash as tg awtlee den, tT _ DOHNLIAPGAR HOOVER — Bibision of Intestigation In the latter purt of the year 1932 the Division of Investigation, United States Department of Justice, csteblished a Technical Laboratory to perform work of & scientific churacter, which might prove of assistance in its investigative cases. Previously, it had been customary in instances considered desirable for the Division to keve technical exprts outside its organization to make scientific analyses. The importance end growth of this phase of the Division's investigctive activity and the desirability of having the work under its close supervision led to tho conclusion that the establishment of a Technical Laboratory was essontial. _ oS The development of the Leboratory has bcon carefully planned by the Division with the assistance ance advice of Dr. Wilmer Souder, a well-known and recognized authority in the ficld of sciontifie endeavor. Dr. Souder, who is at present acting in an advisory capacity in the further dovelopment of the Laboratory, has beon ongeged as a scientist by the Bureau of Standarés for e period of cightcon ycars and has devoted the principal portion of his time to handwriting, typewriting and ballistics identification. His advice and experience have rendcrod invaluable] service to tho Division .in the train-e ing of the laborntory personnel] and in obtaining equipment which is considered the most desirable and essential for the performance of its work. on Some of the instruments used in the technical work include the compar- ison microscope, in which the images of two separate bullets are brought - within a single eyepiece for compnrison; the binoculmr microscope which uses low magnification for the cxamimtion of handwriting, typewriting and other specimens with which it is an advantege to utilize the stereoscopic principle; the research microscope which enables mngnificntion up to 1400 times to be obtained; the ultra-violet lamp for the examination of the ER fluorescent an¢ phosphorescent appearances of objects and substances through -. : which they may be identified; special cameras for photographing specimens; eee chemical apparatus for the exemination of blood stains, qualitative and quentitative analyses; d:licate bulameccs, and similar instrunents, | At the present, examinations are made in the Laboratory of documents =~ or letters to detumiins the identity of the typewriting or the handwriting —- apperring thercon, the existence of watcrmerks end any other information oe, which mey »rove helpful in the investigation of the cise. In addition, s ballistics is considered an importent phase of the scientific work and comp: risons are made whensver the occasion de:.nnds of bullets and exploded shells. Moulage is another fi ature which tha Leboratory is equipped to