by means of sponges soaked in the respective solutions. The clearing of the print was done with acetic acid. The print was wound upon the drum and washed by a stream of water from a hose. The fixing was accomplished by rolling the vat containing the fixing solution under the drum and drawing the strip of paper through the solution for three quarters of an hour. The final washing with running water required eight hours and the drying ten hours. The completed print was turned over to several artists who skilfully retouched out any small imperfections and removed the lines which showed where the six plates were joined together. tration for converting automobiles into such engines should find a wide range of employment-especially in the various mining sections of this country. The truck consists of a small timber carriage somewhat like an ordinary railway hand car and mounted on four flanged wheels. The automobile to provide the motive power for the truck has its wheels removed and is then mounted on a platform or turntable which is supported on the carriage by a central pin. Chain sprockets are substituted for the rear wheels of the automobile and chains placed around them and the sprockets on the flanged wheels. The turntable mounting of the automobile permits it to be turned completely around, so that the radiator may always face toward the front to provide sufficient cooling for the engine water and to enable the driver always to look in the direction of travel. When the car is to be turned, the driving chains are taken from around the sprockets on one pair of flanged wheels and placed on the other. The traction of all four wheels is secured by connecting the two axles by means of a chain running over sprockets mounted at the centers of the axles. The turntable supporting the automobile is held rigidly in place by means of two screw bolts through the platform and the truck frame. How the automobile looks when converted into a railway locomotive. The chassis and engine are mounted on a truck. Traction is secured by connecting axles by chains running over sprockets Even the Animals in the Zoo Must Now Hooverize Working Under Forced Draft. Air- AIR-CIRCULATING Overalls, have been introduced. Their object is to contribute to the farmer's comfort in hot weather. The garment works like a bellows, producing a draft. The harder the farmer digs or hoes the greater the draft. On the front of the overalls is a bib, which is stiff and heavy. The sides of the garment are light and soft. When the farmer bends forward the front part of the overalls falls away from him, leaving a space which is filled with air that enters through an opening and emptying the space filled with air at the back of the garment. When the farmer straightens up again, the back fills and the front is emptied. At every step the air is made to circulate. The suit, therefore, is a kind of an air pump, operated by the moving body. Nothing is worn between the overalls and the skin, the clothing being kept away from the body by wires so that the draft may carry off the perspiration. In order to obtain the full force of the draft, the sides of the garment are buttoned. Buttoning up the sides reduces the draft. un A ton a minute can be loaded into this coal pocket which unloads automatically into wagons or trucks. The coal cannot be stolen Here Is a Theft-Proof Coal Pocket with Six Bins A NEW kind of coal pocket consists of a large steel tank built on a concrete foundation, and divided into six Puffed up not with conceit but with cooling air. His suit is a bellows which creates a draft around his body as he digs or hoes bins, which may be filled through one movable spout leading from the elevating device. By using an electric motor fifty tons of coal can be unloaded into the bins in fifty minutes. Their capacity is 750 tons. The car dumps its load of coal into a pit from which an endless belt with the scoop pockets hoists the coal into each bin in succession. The bins are built with floors slanting outwardly so that wagons can be loaded by gravity. sects during a day and do an immense service to the garden during the summer. It has been estimated by Kirkland that a single toad may, on account of the cutworms which it kills, be worth $19.88 each season it lives, if the damage done by each cutworm be estimated at only one cent. Toads also feed upon slugs and other garden pests. Drop in a Quarter, Turn a Crank, and Buy a Thrift Stamp A MACHINE has been introduced which will provide a thrift stamp when the purchaser drops a quarter into a slot and turns a crank. The apparatus not only saves clerical work, but acts as a cash register on stamp sales. In order to make the machine ready for operation one hundred thrift stamps are placed in the bank in a small, compact roll. When the roll is sold there will be one hundred quarters in the cash box, and the automatic counter will indicate that one hundred sales have been made. The banks are to be found in. stores, schools and factories. Drop a quarter in the slot, turn W Landing under their own guns THEN Germany, shortly after the beginning of the world war, entered upon an intensive submarine warfare against all shipping belonging to the Entente Allies, the U-boat was a comparatively new and untried weapon. Step by step the submarine was developed into a most formidable fighting machine. Size, speed, dirigibility and radius of action were steadily increased. The U-boats became more efficient and dangerous, and the list of their victims increased at an alarming rate. To meet this critical situation, to combat this lurking and elusive monster of the deep which played havoc with the shipping of enemies and neutrals alike, something, some method, had to be devised. It is not surprising that under the stimulus of urgent necessity the inventors of the Entente nations concentrated their efforts upon this vital subject and fairly overwhelmed their governments with an avalanche of ideas and suggestions for protecting ships against submarine attacks and for conducting war against the U-boats. A few of these suggestions were clever and so promising of success that the naval authorities of the Entente countries gave them a trial. But, after many months of experimenting it was found that the only effective method of protecting transports and supply ships on their in convoying them by swift and mobile way through the danger zone consisted warships. One of the pictures which accompany this article gives an excellent illustration of this method in its most upto-date development. How the Procession Steams Along The convoy is led by a torpedo-boat destroyer acting as a scout. It is followed ship. Next comes a torpedo boat towing by a light cruiser, which serves as flaga kite balloon. Then follow the transports or merchantmen of the convoy in echelon formation, that is, each ship steams in the wake of its leader. There are two of these lines or echelons of merchantmen, separated by an echelon of trawlers and protected on the outer side by similar echelons of trawlers. Destroyers, steaming in a zig-zag course, form the flank of the convoy. The rear Undersea Wolves Are Lurking for the Attack, In U. S. by the Sphere and N. Y. Herald New problems in convoying merchant ships were presented by the submarine; not only is it necessary to protect the flanks of the line and keep guard ahead and astern, but the ships must steam in such order in relation to their protectors Underwood and Underwood Smoke-screens have been found highly efficacious as a protective measure against submarines. The point of observation of the submarine is necessarily low, so |