Popular Srirnrr Monf/ih/ 



58.S 



The bridge will be erected over the shortest distance between the central shores of San Fran- 

 cisco and Oakland, the bay there being very shallow and beyond the busy shipping district 



A Bridge Five and One Half 

 Miles Long 



SAN FRANCISCO is planning to 

 build the greatest bridge in the 

 world. It is to connect Oakland and 

 its contiguous districts with San Fran- 

 cisco, and is to relie\e five ferry systems 

 of passenger and \cliicular traffic. 



The proposed bridge will cost twenty- 

 two million dollars and will be five and 

 one half miles long. It will be one of 

 the heaviest bridges ever built, carrying 

 three roadways and four railroad tracks. 

 Its main portion is to be made up of 

 sixteen spans each two hun- 

 dred and fifty feet long 

 Near the San 

 Francisco shore 

 there will be two 

 long and high 

 spans under which 

 the ships will pass. 



The bridge will 

 be a double-deck 

 structure. Three 

 roadways will ex- 

 tend along the 

 upper deck and 

 four railroad tracks 

 along the lower 

 deck. Its capacil\' 

 has been made 

 great enough to 

 provide for traffic 

 for many years. It 

 will have two 

 tracks for overland 

 passenger trains, 

 two tracks for 

 electric trains, and 

 three separate 

 roadways. 



A gear-wheel with a small pinion 

 attached to a flexible shaft imparts 

 the motive power of the chair to the fan 



Fanning Yourself with the 

 Rocking- Chair 



EVERY time you sit in the family 

 rocker and move yourself backward 

 and forward you are unconsciously 

 wasting energy. Why not use the 

 energy? Dozens of inventors have asked 

 tliemselves that question. Charles H. 

 Towers, of Philadelphia, has answered it 

 by making the rocker drive a fan at the 

 rate of four hundred and fifty revolu- 

 tions a minute. 



The accompanying illustration shows 

 a young lady fanning herself by rocking 

 the chair in which she sits. The fan, 

 mounted on a pedestal at the right 

 elevation for a good 

 breeze, is connec- 

 ted by a flexible 

 shaft with a gear- 

 wheel, which, to- 

 gether with an 

 operating lever 

 resting on the floor, 

 can be attachcxi to 

 any chair-rocker. 



The operating 

 mechanism con- 

 sists of a casing 

 with a gear-wheel 

 aftixed to an arm 

 which travels over 

 the floor on a small 

 roller. As the 

 chair rocks the 

 arm tilts up and 

 down, thus rotat- 

 ing the gear-wheel. 

 The gear-wheel 

 meshes with a 

 small pinion at- 

 tached to a shaft. 



