Di Bella 



Fig. 13 - Curve measur- 

 ing the efficiency of a 

 device that climbs a table 

 inclined at an angle p 



Fig. 14 -Device on back 

 part of a wooden frame set 

 on four automobile wheels, 

 consisting of two masses of 

 3 kg each. The nnasses are 

 put in motion by a 12 -volt 

 automobile battery and 

 move the back part of the 

 frame sideways, in the di- 

 rection of rotation 



Tests on the Surface of Water 



We devoted a gi ^ deal of time to tests on the surface of water. We tested 

 models of merchant emu military ships, pontoons, catamarans, and wooden and 

 plastic containers. We shall report here some of the results. 



Figure 16 shows a device with hyppopedes placed on the forward part of a 

 ship model 1.60 meters long and weighing 15 kg. The model advances at low 

 speed on the surface of the water, with a rectilinear motion. 



Figure 17 shows a float with a flat bottom and vertical sides. Length L is 

 4 meters, width 1 is 0.74 meters, and displacement d is 77 kg. It has a two- 

 mass device, each mass having a weight pj of 4.900 kg. Arms R = r are 0.16 

 meters long. The relation of the weight of the two masses to the displacement 

 is 2pi/d = 2x 4.90/77 = 0.127. The relation of double the length of the arms 

 to the length of the hull is 2r/L = 2 x 0.16/4 = 0.08. The float moves at a 

 speed of 0.36 m/sec. 



Another float similar to the preceding one, 1.60 meters long, and with 

 2pi/d = 2 X 0.300/4.20 = 0.142 and 2r/L = 2 x 0.04/1.60 = 0.05, has a speed 

 V of 0.22 m/sec. Since the scale of the models is ^ = 4.00/1.60 = 2,5, the 

 results of the tests indicate that the functioning of the devices can be regulated 

 in such a way as to satisfy the relation v = v {k)^''\ 



With another hull having a flat bottom and vertical sides, and with 2pj/d = 

 2 X 0.30/24.90 = 0.02 and 2r/L = 2 x 0.10/4 = 0.05, we obtained the speed of 



1384 



