the secret, will enable this nation greatly to increase its fighting efficiency. Very generously this good patriot has turned his discovery over to the Department of War. FARMING BY PUSH BUTTON Faraday was sure that the phenomena produced by Volta's pile had some connection with the magnet. He was right. But it took a great many years to prove it; yet all the wonders and conveniences that are operated by electricity are the result of this scientist's persistence. In an article in the February MAGAZINE we shall tell of many new electrical devices that have recently come into use, or that are proposed. The day may not be far distant when a farmer may sit in his sumptuous apartment on Fifth Avenue, New York, or Lake Shore Drive, Chi At cago, and by touching mother of pearl buttons set in the rosewood of his desk, milk his cows, sell his grain, or start a sawmill going in the wooded forty. least these are some of the suggestions that the writer of an article in our February issue makes. You may think he is drawing largely on his imagination, and you will be right, but old Faraday's imagination must have worked overtime, and Napoleon once said that imagination ruled the world. So probably we shall not complain if this chap takes the bridle off for half an hour or so, particularly since his little speculation as to the future of our electric age is really most entertaining. "LET'S SHOW 'EM!" Perhaps you may have thought that the Panama-Pacific Exposition was going to be much like other famous world expositions-marvelous in the vastness and number of its buildings, in the bewildering variety of absorbing interests, in the beauty of the whole. It is all of these, of course. But there is a deep, underlying significance to this wonder show on our western shores, that may be best expressed in the homely telling phrase, "Let's show 'em!" And E. Alexander Powell, the famous traveler and writer, has especially undertaken the task of interpreting to us the Californian spirit that is going to make this great display of 1915 one of the most memorable in the history of national exhibits. It is one of the big features of February TECHNICAL WORLD. WIRELESS AROUND THE WORLD Out into the black night of the Andean tropics a snarling tongue of flame leaps and sputters, and the natives of the primeval jungle come forth from their huts and fall on their faces, as the wireless girdles the earth. A chain of stations is now being put across South America, as part of a system that will reach around the world. The natives think these sputtering wonders are new gods; and so they are-gods that man's persistent effort has created for his serv ice. PERSISTENCE OF MANKIND Darius has been dead for twenty-four hundred years-Cato for over two thousand, but men still constantly set themselves to new tasks. And the February issue of TECHNICAL WORLD MAGAZINE will be a record of exceptional interest. of the unflinching persistence of men everywhere today. On the news stands January 17. Now a cream separator is designed to revolve at a certain speed. Directions say it must be turned at that speed to get correct results. Man-operated separators are turned with a crank handle, which should make a certain number of revolutions per minute. But farmers soon stop counting and guess -they begin to think about how the corn is ripening or something besides cream separating; then they guess and they lose. For example, suppose that a separator is to revolve at fifty-five turns of the crank handle per minute. Suppose you have one hundred pounds of milk to be "separated". At the proper speed this separator delivers ninety pounds of skim milk and ten pounds of cream. This cream tests at about four and a quarter pounds of butter fat. Now increase the number of turns of the crank to seventyfive per minute-as the farm hand is most likely to do when he is thinking of last night's dance-and what happens? The skim milk discharged is ninety-three pounds, reducing the cream to seven pounds. Also the amount of butter fat is slightly less than when the separator is turned at normal speed. Then the investigators proved that when the crank handle is turned too slowly, although the quantity of fluid flowing from the "cream spout" is proportionately greater, it tests very much less. A loss either way to Mr. Farmer. So a certain inventor, adapting a speedometer similar to those used on motor cars, has devised a cream separator indicator which tells in plain figures, right before Mr. Farmer's eyes, how fast his separator is working, and which enables him to save many dollars' worth of good cream in the course of a year. This little device, only one of thousands invented to help the farmer save and gain, is very simply made, like many other wonderful labor-saving and guesskilling inventions. On the top of the crank shaft is mounted an enclosed circular magnet. Over and around this circular magnet, but not touching it, is an aluminum cup on the sides of which are the numbers indicating the speed. The circular turned with the dle. As the mag magnet is crank hannet revolves, it acts with magnetic force on the aluminum dial cup. The faster the magnet revolves, the farther around it pulls the dial, due to the magnetic "torque", and the numbers on the dial showing in the open space tell the number of revolutions of the crank handle. So now whether the farm hand is sleepy, or the farmer himself worried, there is no excuse for either of them turning that separator handle too fast or too slow, and thus throwing good money into the skim milk pail. Farmers are quick to install saving devices; the market for this one is good. GROWING CHERRIES NEAR THE MARKET B By J. L. GRAFF IG, sweet, fancy cherries for many years came from the Far West and, with the long haul, they were expensive indeed to the people of the great markets of the East and the Middle West. Recently two sections in two of the Great Lakes States have made progress in producing and marketing this same fancy fruit, with the result that its price is no longer prohibitive to the general public. In Door County, Wisconsin, and Grand Trayerse and Leelanaw Counties, Michigan, Nature has largely aided in this movement for the public good. when the foliage dries up gradually and therefore continues to supply nourishment throughout the winter months. A cherry grower in Grand Traverse County recently sold eight thousand cases for $1.50 a case. This is only one instance of the immense profit to be made in the small fruitgrowing industry. One single tree in this county brought its owner $118.20 in five years. GROWN IN GREAT LAKE BREEZES "A cherry grower in Grand Traverse County recently sold eight She has there provided narrow strips of land lying between two great bodies of water. These bodies of water, frozen through the spring months, have such influence on the atmosphere blowing over the narrow strips of land that the buds on the trees there are never induced to swell too soon and thus premature blossoms are never caught in a frosty snap later on. When at last they do come out in all their profusion and beauty they are past danger. The same protective influence of Nature is felt in the fall, In the Middle West this industry employs armies of workers. They pick the crops and later are employed in the preserving plants. A single orchard may have one hundred pick ers at work at the same time. They get about forty cents a crate for picking, but prices vary according to the size of the fruit. Some of these people pick all day, some only for a few hours, according to the time they have at their disposal. The cherry has proved itself a boon to the growers and laborers of this section. On the consumers' end, the gain has been no whit less. Cherries from this country can, of course, be sold much cheaper than those from California. 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