750 



All violent vertical move- 

 ments are taken up be- 

 fore reaching the body 



Popular Science Monthly 



One of the Longest Tunnels in the 

 World Is Planned for New York 



THE plans which Science has conceived 

 for the future, and which are being 

 rapidly proved practical, include develop- 

 ments on land and sea, in the air and even 

 under the land and sea. The tunnel system 

 for carlines and for aqueducts has made the 

 subterranean area of some cities as interest- 

 ing and intricate as any parts of the surface. 

 If present plans of the Board of Water 

 Supply of New York city do not miscarry, 

 one of the longest tunnels in the world will 

 soon be constructed to conduct about three 

 hundred million gallons of water daily to 



FRONT AXLE LEVER CHA55I5\ BRACKETv \ ^hc Catslcill aqUCduct. 



^^ s=#7?— ?\ 1 he tunnel will be shaped 



like a horseshoe and will 

 iCor>;NECfiN& ROD BRACKET >5PRiN& f bc lined with coucrcte. 



A New Automobile Spring Which 

 Takes Up Shocks 



ANEW automobile shock-absorber has 

 been invented by Robert E. Olsen, 

 of Seattle, Washington, which is designed 

 to take up the shock before it reaches the 

 body of the car. He provides two springs 

 for the rear and two for the front wheels. 

 Each of the four springs is attached to the 

 chassis frame by two brackets, and the 

 brackets, in turn, are provided with studs 

 upon which are mounted levers which ex- 

 tend to the front and rear axles respectively. 

 The forward end portion of each of the 

 two levers which serve the rear wheels is 

 equipped with rollers mounted on pivot 

 pins — the rollers engaging both 

 sides of the leaf springs. The leaf 

 springs are connected with the 

 chassis by means of brackets 

 for the front portion and arms 

 for the rear portion. Thus, 

 all violent vertical move- 

 ments are communicated from 

 the wheels to the lever and 

 to the leaf springs without 

 directly affecting the chassis. 

 Bumps, therefore, will tend 

 to lower the body of the 

 automobile instead of raising 

 it, but so slightly that the 

 effect will be neutral- 

 ized and the occu- 

 pants of the car will 

 scarcely be conscious 

 of it; which is just 

 what the inventor 

 intended. 



Vacuum Cleaning by Foot Pressure. 

 You Walk on the Bellows 



1"^HE fact that there is no electricity in 

 your home need not hinder you from 

 using a vacuum cleaner. A novel cleaner 

 has been brought out which can be oper- 

 ated without electric power and without 

 other exertion than required for walking 

 up and down the floor. Pumping-bellows 

 are attached to your feet, and you are 

 assured of some profitable exercise during 

 the cleaning. A compression spring, pro- 

 vided just under the heel, does the work. 

 The guiding handle is fitted with a 

 nozzle and a dust filter like those on other 

 vacuum cleaners. The air hose which 

 leads from these, runs to 

 the foot-bellows, as the 

 illustration shows. Each 

 of the two bellows 

 has clamps for at- 

 taching it to your 

 foot. 



By lifting up and 

 down on the bel- 

 lows, as you would 

 do in walking, air 

 is forced up the 

 nozzle from the car- 

 pet. The dust from 

 the carpet is car- 

 ried up through the 

 apparatus with the 

 air. But on reach- 

 ing the filter the 

 dust falls and 

 settles down in the 

 cylinder. 



