. Guide to finger-print identification [electronic resource]. e appliances should beadjusted to the leading lineation of one exhibit and then, taking careto maintain the adjustment, apply it to the other. Instruments are now used by engineers and others for drawingcurves which I have found to serve this purpose very well. Theyare called flexible curves. They are self-clamping and are made B E E Fig. 18. 59 in various sizes by Mr. Wm. J. Brooks, scientific instrumentmaker, 33, Fitzroy Street, Tottenham Court Road, W. Pattern B(self-clamping) is the form which I recommend for the above
. Guide to finger-print identification [electronic resource]. e appliances should beadjusted to the leading lineation of one exhibit and then, taking careto maintain the adjustment, apply it to the other. Instruments are now used by engineers and others for drawingcurves which I have found to serve this purpose very well. Theyare called flexible curves. They are self-clamping and are made B E E Fig. 18. 59 in various sizes by Mr. Wm. J. Brooks, scientific instrumentmaker, 33, Fitzroy Street, Tottenham Court Road, W. Pattern B(self-clamping) is the form which I recommend for the above twelve inch size is sufficiently large. They are also made in sizesof nine, and of eighteen, inches. This pattern has a steel strip, likethe lead ribbon already mentioned, and by means of a stiff-hingedlinkwork attached to tabs the shape of any curve given to it isretained as long as may be wanted. The strip of steel should not bepressed between the tabs, and when bending or straightening theapparatus that should be done bit by bit, beginning at one Fig. 19. Pattern B (self-clamping). 9 in. size. In dealing with approximate curves which occur amongst thelineations of finger-prints, it would of course be quite absurd toattempt to apply the principles of conic sections. These concrete,slightly irregular forms cannot admit of rigid methods of mathematicalreasoning applicable to ideal concepts. The simpler terms used inmathematical drawing, however, with such restrictions as have beenmentioned, may often be very helpfully employed in describing orreferring to particular finger-patterns before a magistrate or a jury. The Use of Lenses, Compasses, etc. When examining a direct nature-print without enlargement anordinary botanical lens gives much assistance in distinguishing minutedetails. A lens with a two inch focus I have found very pleasant to 6o work with, but one must naturally suit ones own eyesight. For my ownpart I can easily write the Lords prayer three times within
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