Di Bella 



Fig. 9 - Land-tested device 

 weighing 30 kg, with two 

 masses consisting of two 

 pieces of lead weighing 200 

 grams each 



Fig. 10 - Results of tests on 

 the device in Fig. 9 



With a device having two masses of 

 the same type, but with a weight of 450 

 grams and with two pieces of lead weigh- 

 ing 20 grams each, we obtained the re- 

 sults shown in Fig. 11. K we assume the 

 efficiency of the electric micromotor and 

 the transmission to be equal to 0.20 at 

 the maximum speed of 0.61 m/sec, the 

 absorbed power measured on the motor 

 shaft is 4.6 watts. The device advances 

 toward the right or toward the left, ac- 

 cording to the way in which the rotating 

 masses are oriented. 



Figure 12 shows a device placed on 

 four wooden heels covered with soft rub- 

 ber. It weighs 1,275 grams and climbs a 

 sheet of glass, inclined at 59° on a hori- 

 zontal plane. 



Figure 13 shows one of the different 

 curves obtained to measure the efficiency 

 of a device that climbs a table inclined at 

 an angle /3 on a horizontal plane. Differ- 

 ent values of /3 were assumed, and for 

 each value the height of the climb (h) and 

 the time of the climb (t) of the device 

 were measured. By multiplying the weight 

 p of the device by the h/t we obtained the 

 power rendered by the device. It can be 

 deduced from the figure that the device 

 renders the greatest power when it climbs 

 a table inclined at an angle fi given by 

 tg /? = 0.41. 



Figure 14 shows a device placed on 

 the back part of a wooden frame 2 meters 

 long and 1 meter wide and having four au- 

 tomobile wheels. The device, with two 

 masses of 3 kg each, put in motion by a 

 12 -volt battery of an automobile, turns 

 the frame around vertical axes. The front 

 part of the frame remains substantially in 

 the same position, while the back part 

 moves sideways to the right or left, ac- 

 cording to the direction of rotation of the 

 two masses. 



Figure 15 shows a Fiat 1100 automobile. On the lower face of the bottom of 

 the trunk a device with two masses is placed, turned toward the road surface. 

 The weight of each mass is 6 kg, and the motor of the device, put in motion by 

 the automobile battery, absorbs a power of 220 watts. 



1382 



