1888.] 



on Personal Identification and Description. 



353 



is simply by sliding the rings to which they are attached at either 

 end along the rod which passes through them. It is easy to arrange 

 a more delicate method of effecting the adjustment if desired. 

 Hitherto I have snipped out the notches in the cards with a cutter 

 made on the same principle as that used by railway guards in 

 marking the tickets of travellers. The width of the notch is greater 

 than the width of the wire by an amount proportionate to the allow- 

 ance intended to be made for error of measurement, and also for that 



Fig. 7. 



Reduced plan of complete apparatus. 



Explanation. — A, the common axis; c^, c^, the cards; T, tilting-frame, turning 

 on A (the cards rest by their front ends on F, which is the front cross-bar of 

 T, at the time when the heavy hinder end of T rests on the base-board S) ; 

 K is the key-board ; R R are the rods between which the wires are stretched '; 

 BB are the bridges at either end of the key-board, over which the w^ires 

 pass. (The explanation refers to the other figs., as well as to this.) 



due to mechanical misfit. There seems to be room for 500 cards or 

 metal strips, and ample room for 800 of them, to be arranged in 

 sufficiently loose order within the width of 30 inches, and a key of 

 that effective length would test all these by a single movement. It 

 could also be applied in quick succession to any number of other 

 collections. 



Measurement of Profiles. — The sharp outline of a photographed 

 profile admits of more easy and precise measurement than the yielding 



