Mohave County miner and our mineral wealth., 1922-05-19

long will pass a given point in on
 second. We thus learn the relation
 between velocity, frequency and way
 length.
 We can produce waves in water b,
 throwing stone into the water
 When in motion, large stone ha
 greater energy than a small stone
 When the large stone strikes th
 water it is able to, and does, impar
 more energy to the waves than tn,
 small stone. Therefore the large ston,
 causes waves larger than those caus J ed by the small stone. Radio wave
 must be produced in either the sam,
 manner, by something moving whicl
 is capable of affecting the ether. Int
 electron is the only known thing whicf
 will do this.
 1 Until late years it was thought that
 all matter was lnadesup of molecules
 which h;in turn were composed of atoms
 which were believed to be the small.
 est part of an element. It is now
 known that the atom may be sub- divided. The subdivision is termed the electron. Technically, the electron is the Beta ray of radium, and is a car rier of negative electricity. If cleo irons are caused to move rapidly to- and-fro, it is possible to produce way es in the ether. A large number of electrons moving to-and-fro will cause an ether wave of large amplitude, and the frequency of the waves depends spon the frequency of the to-and-fro movements of the electrons.
 In. the alternating current electric light circuits the electrons move to- and-fro, but they move comparatively slowly, 60 times per second in most alternating currents. To cause a wave in the ether we must make the cleo irons move to-and-fro at least 5000 times per second. Alternating cur rents which have to-and-fro move ments of the electrons of 5000 or more times a second are said to have radio frequency. The study of the production of alternating currents at radio frequency comprises the major part of the study of radiSS communi- cation. ,5t 4 xI9%
 Suppose we place a strip of metal, a hack-saw blade, in a vice. We pull the top of the blade toward us, and then let go. The blade springs away from our hand and we observe that it vibrates to and fro until it finally comes to rest. Closely observe what has taken place. We first gave ener- gy to the blade by pulling it away from it's point of rest. We set the blade free by removing the hand. The stiffness of the blade (its elas- ticity) made it move from the dis placed position toward it's point of rest. When the blade. reached its point of rest it had gained speed to it's greatest amount, and at that point the stiffness of the blade ceased to cause it to move. The weight of the blade carried it on beyond the point of rest. The further the blade nov ed beyond its point of rest, the more the stiffness of the blade opposed it's motion. At its greatest displacement, the increased stiffness of the blade was sufficient to stop the motion, and SO the blade started to come back to- ward it's point of rest. These events repeated themselves in order, each dis placement being a little less until the blade finally come to rest. By plac- ing a weight on the end of the blade the period of the oscillation would be changed. By lengthening the blade (changdng it's elasticity the period of oscillation would be changed also. Thus we see that we can start oscil- lations if we have two factors: (a) something which will start move ment to a point of rest when it has once been displaced, and (b) some thing which will keep its motion go- ing beyond the point of rest. In cleo tricity we have these two factors and it is by their use that we may gen crate radio frequency currents.
 Any change in the amount of the current flowing in an electrical cir cult is opposed by whatever self-in- ductance the circuit may contain. resists the building up of a current when it is started flow ing, and also resists the stopping of the current if we shut it off. This is'| the same effect as that shown on a moving body. An automobile. .is ,hafdl to place in motion, but once moving it is just as difficult to stop it. In- ductance in electricity is the same as weight in objects. As the weight of the hack-saw blade caused the blade to pass beyond it's point of rest, so does inductance cause current to pass beyond it's point of rest, which is zero current.
 Capacity in an electric current urg- es the current to it's point of rest when it has been carried beyond that point in the same manner that the spring does in a material body. If