rRKSlDI-:i\'nAL addkioss — sixtion a. 



33 



Fig". 15 shows one in which the aUernale ])ull of a weit^hted 

 rope, passing over a pulley, and a Hoating tank o])erates 1)\' gear- 

 ing- two air-compressor cylinders. 



Fig. 16, taken from the Sciciitifii- . I lucrlcaii, shows some 

 recent inventions which have heen dexiscd for the purijose of 

 obtaining power from rlie waves. The first consists of a 

 central scpiare float, carrying air-c()nii)ressors, the oscillation of 

 the side-tioats cansing air to be delivered into the receiver shown, 

 The advantage of this method is clamied bv the inventor to be. 



J'u;. lO. — l^'uur (k'vices for obtaining powc=r irom waves. 



that power is generated inde])endently of the direction of the 

 waves, because the auxiliary floats extend in four directions. 

 l"he next method consists of a large floating vessel, open at one 

 side, to the bottom of which is attached a hollow triangular 

 piece with movable hinged vanes. The incoming waves cause 

 these vanes to be folded against the triangular centre, and, on 

 the return, water flows through the o])en back of the triangular 

 frame and opens out the vanes, thus operating air-com})ressors. 

 In the third method shown, the oscillation of two floats com- 



