Page:Popular Science Monthly Volume 90.djvu/474

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��Popular Science Monthly

��number of the projectile, and subtract therefrom the sector number.

It will be observed that the radially- placed strips on the target are numbered. The two at the extremities are lOO,

��tSUCKER DISK

��PROJECTING TUBE

��TRIGGER PIVOT

���The arrangement of the color arcs on the board and details of the projectile and thrower

while the intermediate strips are 50, 80, 90 and 50 respectively, the first strip at the left being the sum of the sector numbers 20 and 30, the second strip the sum of the sectors 30 and 50, and so on. As the sucker disk is only slightly smaller in diameter than the width of the strip, it is obvious that the disk will not adhere unless it strikes the strip fairly between its edges, so that any one performing that feat is entitled to a high score. This is determined by multiply- ing the value of the strip by the number of the projectile. If the missile should strike the pot of gold the throw would be valued 1000.

Instead of playing alternately, each thrower uses the six projectiles which are assigned him, which may be marked from I to 6, or any other numbers; but all the players should have the same numbers. This arrangement of the scoring numbers, combined with the values of the projectiles and the rainbow arrangement, distributes the amounts capable of being gained by the combined shots, so that a poor thrower stands a better chance of evening up with an expert handler of the projectile.

��An Improvised Trouble Light for Motorists

MANY times a motorcyclist, or even an autoist, is caught on the road at night with tire trouble and finds him- self without a trouble light. In this dif- ficult situation, scrape up a small pile of sand. Pour about a cup of gasoline on it, and touch a match to it. This will burn for fifteen or twenty minutes and will provide sufficient light to make the repair.

��A Safety Envelope that Affords Real Protection

A SAFETY envelope is Intended to give additional protection against opening by an intruder. In the one illustrated in Fig. i, parts A resemble the usual kind with perforated edges, but there Is also used the flap B, this being also gummed and perforated and folded over at the last. The whole Is shown in Fig. 2 with the flap pasted down. The perforations P in the flap come just over the other perforations, so that this end can be torn off as usual. Another method Is seen In Fig. 3. The same envelope Is used, and it is spread out flat. Upon it Is pasted a square of preferably thin paper MNOR, which is opaque on the under side. This sheet is written upon and then folded over as seen In the vertical lines, so as to be somewhat smaller than the envelope; then the latter Is folded as before and pasted, but now the edges need not be

��SECOND FOLD \

��FI6!!.

��\iimm;w/r»; m/mf!m>!>

����f&l GUMMED

��A perforated opening line to prevent contents of an envelop>e from being tampered with

pasted, because the folded paper answers the same purpose and gives a tight edge, and an attempt to draw the paper out at the sides would be detected as readily as would the actual opening of the envelope.

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