Show IT The he Reason easo W 1 WHY DOES AN EXPLOSION BREAK WINDOWS AT A DISTANCE An explosion is a sudden expansion of ot a substance like gunpowder or orsome orsome some somo clastic elastic fluid or other substance that has the tho power power to explode under conditions ons with force lorce and usually a aloud aloud aloud loud report When an explosion occurs occurs occurs oc oc- oc- oc curs the air and everything surrounding surrounding sur sur- rounding the tho thing that explodes is violently disturbed The The- Theair air Is thrown back in waves which aro arc powerful i In the tile exact proportion in which the explosion is powerful I The explosion acts in all directions at once with equal force A great I hole may be torn tom in the earth beneath beneath beneath be be- neath the explosion If It there Is anything anything any any- thing over the explosion that is blown away unless Its power of ot resistance is sufficient to withstand the power of ot the explosion Then also the air surrounding on all sides Is forced back against things in its p path Very often this air which is suddenly suddenly sud sud- I Ip denly forced back by the power of ot the explosion is thrown against houses at a distance These houses I may be so BO strongly built as to be able to withstand the effect of ot the exI explosion explosion ex ex- I but still certain parts of ot them such as the windows and the bricks of ot the chimney may not be beable beable beable I able to withstand this sudden pressure pressure pres- pres sure suie of ot air against ag them and they I are are forced In The wine an explosion acts on tb Hi tl the windows just the san sai saw you stood on the hands against the fa wJ pushed them In ln thrown against a wind v force than the glass c ca cat i break the window and explosions may be so pc po throw the air back am and them with such force windows at a great dish mile or more aw away WHY DO DOTHE THE EYES EVES IN 1 TURES SEEM TO FO FOL FOLIt If It a It persons person's picture the eyes ejes of the person perso person into the lens or oj op camera then the eyes ejes h in inI I will always alwa's be directly b O to follow whoever is J 1 to I 1 This Tills is also true of ot p pal pall subject being pain painted led is islo isto I to lo look directly at the the artist paintS paintS' the tho PI yes Gyes so pointed then th the picture will follow tollow you are looking at a picture and the eyes ejes do not foil will know at once that that looking at the camera o oI or orthe I the picture was bein painted From the Book o B-o k of ot permission of ot the Burea trial Education In Inc ton D D. C C. h |