MAN AND ELECTRIC BLUE PRINTING MA A CHINE BLUE printing machine, de signed for econ omy, that will print continuous rolls or separately cut sheets, is a recent device that is finding favor among draughtsmen. The paper, traveling with the feeding belt on an incline with the tracing, is carried to the feed roller and around the printing cylinder, in which is mounted the lighting apparatus. The blue print paper is then delivered to the light-tight storage compartment and the tracing returned to the operator. Any length of blue print can be made, from two to forty-eight inches in width. HIS MACHINES BLUE The machine is automatic. The only work required is that of placing the tracing and the blue print paper on the continuous traveling belt. There is no need of working in a darkened room, as the lightproof compartments take its place. DIGGING POTATOES WITH POWER A MECHANI- digger has been invented for use in large potato fields where scientific harvesting methods are required. It is drawn by horses and operated by a light-weight, 4 horse-power gasolene engine. This machine lifts out the roots and loose potatoes, separates the clinging potatoes from the dried vines, and deposits the potatoes in crates. That grubs the potatoes, separates them from the vines, and deposits them in crates. The photograph has been retouched to emphasize the salient parts of the machine A LESS TELEPHONY T THE Omaha headquarters of one of the great Western railroads. experiments in wireless telephony on trains have been conducted with a view to perfecting the system so that communication may be established with trains at any time. Messages have been received by operators on trains employing the ribs of an ordinary umbrella as antennæ and making connections by means of the high resistance of the human body. In the wireless laboratory illustrated herewith the six blocks represent cars. The method employed in coupling the wires between cars is also shown. It is con AN UMBRELLA ANTENNA Operator receiving a wireless message through the ribs of an umbrella fidently expected IN California, where the majority of bungalows are built without basements, it is sometimes more convenient for the plumber to lay the necessary pipes before the floor is laid. The illustration shows such a case in which the plumbing work was done for a ten-fixture installation as soon as the foundations were laid and before any carpentry had been done. This system, however, cannot be successfully employed in districts where the houses are built with basements. PLUMBING BEFORE CARPENTRY that the system will Installing the plumbing system of a house before soon be perfected. construction has been started on it They consist of a canvas sheet stretched upon metal tubes and can be folded back out of the way lever each chain is given an initial tension sufficient to keep it firmly in position. A NOVEL METHOD OF TESTING ARC LAMPS I N order to test street arc lamps under actual service conditions an outdoor rack and a portable in- The rack accom- ing used it is rolled COMPACT AND SANI into the compartment erected just back of the rack. TARY Replacing the offensive, germ-laden bunk of earlier days T BENDING PIPES HE pipes or tubing shown in the accompanying photograph were all bent on a recently invented machine. They range from one to six inches in diameter, the radii of the bends being from three inches to three feet. The time for making these bends varied from one half to two and one-half minutes. Some of these bends, done by hand, would have required a gang of men, gas or fuel of some kind, and several hours of labor, so that in the saving of expense this machine pays. for itself in a short time. A 5-horse-power electric motor drives the machine, and it operates on any shape of pipe or tubing and makes any shape or style of bend. PIPES BENT INTO VARIOUS SHAPES THE TELEPHONE METER An inexpensive machine for ascertaining the length of telephone calls By means of which a pipe can be bent to any desired shape in a few minutes THE WISDOM OF INVESTING THROUGH BANKERS 134 BURTON J. HENDRICK 136 ARE AMERICANS MORE GERMAN THAN ENGLISH? JAMES MIDDLETON 141 148 170 ITALY AND THE GREAT WAR (Illustrated) W. MORTON Fullerton SHALL WE HAVE RESPONSIBLE GOVERNMENT? (Illustrated) THE DRAMA OF THE DYESTUFFS - WILLARD C. BRINTON 203 221 229 TERMS: $3.00 a year; single copies, 25 cents. For Foreign Postage add $1.00; Canada 60 cents. |