C24 



Popular Science Monthly 



Little Ways in Which You Can 

 Save GasoUne 



DO not use gasoline for washing or 

 cleaning; use kerosene. Do not 

 allow your automobile engine to run when 

 car is standing. Have your carbureter 

 adjusted to use leanest mixture. See that 

 bearings run freely and are well lubricated. 

 Keep tires fully inflated. Protect the 

 radiator in cold weather. Change gears 

 rather than climb hills with throttle wide 

 open. Do not use your car needlessly or 

 aimlessly. Do not do stunts. 



Discovering a Card Chosen but Not 

 Taken from the Pack 



FIRST notice the bottom card, then 

 take the pack in the left hand, hold- 

 ing it with the fingers on one side and 

 the thumb on the other. Secretly draw 

 down the bottom card about ^ 2 i^^- Let 

 the right hand approach the pack, and 

 with the first and second fingers draw 

 down the cards, one by one, }/2 in., be- 

 ginning with the top card and so on, invit- 

 ing your audience to stop you at any 



card they 

 ^7x choose. This 



j^-^^Si:^^ is clearly 



shown in the 

 illustration. 

 The thumb of 

 the right hand 

 has remained 

 beneath the 

 pack in con- 

 tact with the 

 bottom card. 

 The thumb 

 should have been previously moistened 

 slightly so as to adhere to the bottom 

 card. When your audience has indicated 

 the card at which they desire you to stop, 

 draw all the cards so far selected com- 

 pletely away from the pack, drawing 

 with them also, unknown to the audience, 

 the bottom card. If this is done quickly 

 it is impossible to detect that the bottom 

 card is drawn away with the upper cards. 

 Since, however, you know the bottom 

 card, you can disclose it at your leisure 

 by some means or other. It is needless 

 to say that the bottom card is really 

 supposed to be the last card at which you 

 stopped in going through the pack. 



Secretly draw out the bot- 

 tom card a short distance 



The effect of the foregoing trick may 

 be greatly enhanced by shuffling the 

 pack after having noticed (secretly, of 

 course) the bottom card. This apparently 

 does away with any previous arrange- 

 ment. The object of the shuffles is to 

 leave the pack, or certain cards in it, 

 exactly in the same position as they were 

 before. Shuffles of this kind, which leave 

 certain cards undisturbed, are known as 

 false shuffles. There are many ingenious 

 methods for shuffling a pack in this 

 manner; but for this purpose two methods 

 are described which leave the bottom 

 card still at the bottom, or the top 

 card at the top. 



Take the pack in the left hand in the 

 ordinary way and shuffle it with the right, 

 leaving a number of cards alternately at 

 the front and rear of the pack; that is, 

 leave some at the top, then some at the 

 bottom, again some at the top, and so 

 on, taking care that the last batch shall 

 always be at the bottom of the pack. 

 This will always leave the bottom card 

 at all times in its original place. 



Another method is to divide the pack 

 into two equal parts, being careful that 

 the card known to you is on the bottom 

 of one of these packs, and keeping in 

 mind which pack has this card. Lift the 

 corners of the two packs and let the 

 cards fall alternately as nearly as possi- 

 ble, the corners overlapping, so that, 

 when the shuffle is finished the two packs 

 form one pack. The only thing to watch 

 closely is to see that the card known to 

 you falls on the table first. This leaves 

 that particular card at the bottom of the 

 pack. — Hereward Carrington. 



Rejuvenating the Ribbon on an 

 Adding Machine 



THE writer was unable to secure, 

 without considerable delay, theproper 

 bichrome ribbon for an adding machine. 

 The one in use, though not badly worn, 

 was too dry to give a satisfactory impres- 

 sion. As the fresh color of the ribbon 

 indicated that the pigment was still in 

 the fabric, it was decided to see if an ap- 

 plication of oil would not loosen it up. 

 This was tried, and after two or three 

 applications of machine oil the ribbon 

 worked as well as ever and continued to 

 render good service for several months. 



