. Guide to finger-print identification [electronic resource]. visable to prepare two such differently encircled photographsfor enlargement, or three if three likely points indicate practicalpossibilities in an important case, and so on. The circle may bedrawn after enlargement if the centre and radius have been markedbeforehand in the original. This gives a better appearance. A circleenlarged by photography looks rough and clumsy. The inner edgeshould uniformly be followed in such a case. See figs. 17 and 24. 7. The photographic enlargements should preferably be madeon paper without glaze. It
. Guide to finger-print identification [electronic resource]. visable to prepare two such differently encircled photographsfor enlargement, or three if three likely points indicate practicalpossibilities in an important case, and so on. The circle may bedrawn after enlargement if the centre and radius have been markedbeforehand in the original. This gives a better appearance. A circleenlarged by photography looks rough and clumsy. The inner edgeshould uniformly be followed in such a case. See figs. 17 and 24. 7. The photographic enlargements should preferably be madeon paper without glaze. It is often necessary to make slight pencilor other marks for the purpose of a survey. 8. Such marks should be very slight and of a different colourfrom the photographic enlargement, so as not to blend with andconfuse the lineations of the pattern itself. Aniline colours areconvenient, but are apt to smear the exhibit if moisture touches themarks. Finely-pointed red or blue crayon pencils of good qualitymay be used, or an ordinary hard graphite or lead 1 73 g. The enlargements should, as a rule, be made on a scale fixedofficially, following either the metric or the English system. If themetric system is followed, enlargements of 20 diameters give verygood results for putting before a jury. Uniformity is desirable forinternational use. Twenty-four diameters would be a good mediumif the English measurements must be followed throughout. Forpetty trials enlargements may not be necessary in some cases wherethe pattern is somewhat complex and clear. 10. If a person suspected is in custody and his finger-prints canbe legally secured, these should, if possible, be taken by some oneexperienced in official finger-printing. If that cannot be done, caremust be taken to have the finger-prints of each hand in their naturalorder and to have available records or other evidence of the fact atthe trial, together with the adhibited signature of the prisoner. [Thequestion of cautioning the p
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