US1775794A

US1775794A - System and means of fingerprints

Info

Publication number: US1775794A
Authority: US
Publication date: 1930-09-16
Anticipated expiration: 1947-09-16

Description

sept. 16, 1930. T WHITE 1,775,794

SYSTEM AND MEANS OF FINGER PRINTS Filed Feb. 27, 1928 IN V EN TOR,

vA T TURA/EVS.

. print is faked or not.

Patented Sept. 16, 1.9.30

, UNITED STATES LESLIE 4rr. WHITE, or vENTU Eh1c2rIfroENr"ff l Y SYSTEM AND MEANsfoEEIueE'ErmINfrs f5? j j f Application led February 27,7..1923- This'invention relates to aV system and means of finger prints.

It is the universal practice to have each criminal make a finger print impression so that the police records may be kept complete. After any given crime, one of the first acts is to have'a finger print expert examine the location of the crime ,and attempt to find finger prints uponv any article and if found to carefully take the article, if it is movable, or if not, take a photograph of the finger print Vat the place found. This photographed finger print is then compared-with finger prints of known criminals. The system, however, is far from exact and criminologists are usually satisfied f'they find twelve pointsv of simi larity between two finger prints. This however,V renders a system Aof'finger prints Vfar from being an exact science for the very reason that it is a simple matter to forgenger prints. v l

The present system has forV an object a means whereby finger printing is reduced to an exact science to the end that there would be hundreds of similarities or dissimilarites to prove or ,disprove that any certain person committed the crime. Y

Another object is the provision of a finger print system which cannot be fabricatedand which is so clear and exact as to not-only bring out every ridge and furrow but likewise to permit a comparison of the various glands and ducts of the skin. By doing this, it is possible to tellwhether any one given finger Other objects of the invention'will appear as the specification proceeds. .l

In the drawing: l Y v Figures l and 2 represent finger print im` pressions which are to becompared.

Y Referring now to the drawing, I have shown two finger print impressions designated as A and B. The same camera withthe same lens is supposed to take photof graphs of the finger printsV to lthe end that there would bea uniformity of size of said finger prints. After Va lgiven criminal or susifoundgathe Selene ofthe crime. a photograph is `talneli'j off said g fingerprints by Athe same icamerai and lens I as took the photographA as, iforlinstance, show iij'byj B.' ,Thirslphlotograph Bmaybe enlarged lso asfto have the theflatent `pri"nt1 taken "atV "the L scene of the crime would 'flike'wise-V have` to be enlarged photographically tothe .same scale `as the jshowing fin "Figure 1y iitlii's scale was adopted.v "The record the police ,station is then consulted and the "ilrrllvestigator"'williuse' "the `positive=trans"parencyrB and may pick several of thenumbered positive transparencies A for points of similarity. The transparenc y B will be placed over the transparency and in front of a source of light. It simply becomes a .question then of balancing the ridges and furrows of the transparencies and a given area may be selected for comparison,

:as indicated by the zoning circles l and 2 ofsaid transparencies.

If the transparencies as showrri'at `After `crime has are identical with reference tothe circle, it

will be seen that the ridges will coincide as will likewise the furrows and if the enlargements are great enough, the general appearance ofthe skin, particularly the gland structure, vmay likewise be examined. Thus, in place of the usual comparison as now enerally used by finger print experts whichv at the most only gives from three to forty points of similarity, it will immediately be seen that b y my systeml can get hundreds ofpoints of similarity or dissimilarity and definitely prove thatV a given criminal vdid or did not commit the crime in question or at least was in some `manner connected with the crime.

As stated, in case of doubt, the ducts and flujo be iled in the usual manner and duplicates thereof could be sent to the different police stations and bureaus of identificaton throughout the country. The system is inexpensive and does not require the use of complicated apparatus or projection apparatus of any kind or character. The transarencies might be either glass plates or cut lm.

Having thus disclosed my invention, what I desire to secure by Letters Patent is:

l. A system of finger prints which consists in photographing a given finger print and providing an enlarged transparent positive of a given scale, photographing a suspects finger print and enlarging to provide a transparent positive of the same scale as the iirst transparent positive, superimposing one transparency upon the other, and placing the superimposed transparencies in front of a light to determine similarity or dissimilarity between the ridges and furrows.

2. A system o? iinger prints which consists in providing an enlarged transparent p0si tive of a given scale of a known linger print, providing an enlarged transparent positive of a suspects finger print of the same Scale as the first finger print transparency, selecting given zoning areas on both transparencies, then superimposing one transparency upon the other, and comparing the ridges and furrows of the Zoned areas.

In testimony whereof, I have Signed my name to this specication, this 18 day of February, 1928.

VLESLIE WHITE.