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NOTHING is more enjoyable and ex- 

 citing than a toboggan slide down 

 some steep incline. No one need 

 forego this pleasure when a toboggan, as 

 here described and illustrated, can be so 

 cheaply constructed. 



The essential part is the snow shield, 

 which consists of a curved wooden piece, 

 as shown. An old cheese box without a 

 knot or crack fills the bill to perfection. 

 First carefully 

 taice out the 

 nails and pull 

 out the top and 

 the bottom. 



Next procure 

 a good board the 

 same width as 

 the cheese box. 



It should be without cracks, and smooth 

 on one side. Nail slats on the board, 

 spacing them 1 ft. apart, and also fasten 

 a strip on the end of the cheese box at the 

 top, after the end of the box has been sawed 

 ofif to the required length. Nail the other 

 end of the box to the board, thus forming 

 the curve or snow shield of the toboggan. 



Place the side pieces connecting the 

 top of the curved part with the board 

 of the toboggan, thus forming handles and 

 at the same time stiffening the shield. 

 The top ends of the curve can be further 

 strengthened by putting on strong leather 

 straps. — Peter J. M. Clute. 



A flat board strengthened with two cross 

 pieces makes a toboggan. A curved section 

 from a cheese box furnishes a snow shield 



Place 50 grams, (about 2 oz.) of crystal- 

 lized photographer's hypo in a small cup 

 and add 10 cubic centimeters (100 

 drops) of water. Place the cup and con- 

 tents on the stove, and in a few minutes 

 the mixture will dissolve, forming a clear 

 liquid solution. Now pour the mixture 



into a thin glass 

 tumbler, the 

 temperature of 

 which has pre- 

 viously been 

 raised by dip- 

 ping it in hot 

 water. Set the 

 solution aside 

 and allow it to 

 cool, being care- 

 ful not to dis- 

 turb it. When cooled to room tempera- 

 ture, pick up the tumbler, give it a quick 

 shake, or add a tiny crystal of the hypo, 

 and the dissolved salt will instantly 

 separate in a solid mass of crystals, ap- 

 parently ice. At the same time, the tum- 

 bler which was previously cold, becomes 

 decidedly warm, illustrating the scientific 

 fact that water in freezing liberates heat. 



The Mystery of Freezing Water 

 Instantaneously 



TO produce "ice" in the twinkling of 

 an eye, as if by magic, is very 

 simply and easily done. ^ 



Stop to Prevent Snow from Entering 

 Under a Garage Door 



1ARGE garage doors must swing clear 

 -> of the floor because there is no 

 threshold strip at the bottom and this 

 makes rather a large opening for snow to 

 drift in on a windy winter's day. One 

 owner of a private garage found that this 

 opening caused considerable trouble as the 

 doors faced the direction of most gales. 

 He devised a drop, however, to work 



451 



