Popular Science Monthly 



625 



as the angle-block B, the drawer face and 

 handle are fastened. A pivot wheel C is 

 nailed to the center of the drawer bottom. 

 This wheel fits into a slot in the carrier- 

 shelf D. The follower-block E, made of 

 a wood base to which a spring and wire 

 brace are fastened, slips under the side 

 pieces of the drawer. Pushing it against 

 the material filed causes it to grip fast. 

 It is released by a slight vertical pressure. 

 The most important part of this file is 

 the angle-block. Usually the first tabs of 

 an index are not visible, being wholly or 



If, instead of cards, manuscripts, themes 

 or large size envelopes are to be filed, the 

 drawer shown in / will prove a better 

 arrangement. Cardboard shelves are 

 slipped into the kerf grooves and form 

 pockets for filing. — Edward R. Smith. 



Three Methods for Finding a 

 Chosen Card 



FOR this trick the chosen card must be 

 worked to the top of the pack. If it is 

 there already, well and good; but if not, it 



Details of the file parts which are made up to slide in an opening in a desk after the 

 manner of a drawer, the front and follower block holding the cards in a tilted position 



partly concealed by the face of the drawer. 

 The automatically operated block B of this 

 file is cut to a bevel, the lower surface of 

 which is parallel with the follower-block F. 

 Suppose that the cards are arranged as 

 shown in illustration G. With the pushing 

 of the drawer into its casing, as in H, the 

 momentum of the cards tilts them back. 

 When the drawer is pulled out the bevel 

 prevents the cards from being thrown 

 forward. In steel filing equipment this 

 space between cards and drawer-head is 

 an added protection in case of fire. 



must be brought there by some means or 

 other. This is generally an easy matter, 

 even without sleight of hand, and can 

 usually be effected under the pretense of 

 looking through the pack. When the card 

 is once at the top a false shuffle may be 

 given, to throw the onlookers off the track. 

 Then push the top card out sideways 

 beyond the rest of the cards. Let the pack 

 fall on the table. The resistance of the air 

 will cause the top card to turn over and 

 appear face upwards, all the other cards 

 remaining face downwards. 



