Workmen Shot From Tunnel Through the Bed of a River
Militia Aero Corps
Climbing Steel Poles with the Aid of Iron Shoes
An Invisible Ink
Eustace L. Adams
BROOKLYN BRIDGE was jammed with mid-afternoon traffic. On the East River, far underneath the lofty structure, tugs and barges were busy with their endless tasks. Suddenly passengers on the bridge and crews of boats heard a muffled roar, and a geyser shot from the river twenty feet into the air.
Rocking a Three-Hundred Foot Masonry Tower with Your Hand
BY the mere pressure of your hand you can rock “Sather Campanile”—the three-hundred-and-two-foot memorial tower just completed on the campus of the University of California. In order to minimize the danger from earthquake shocks, the architect, Professor John Galen Howard, and the engineer, Professor Charles Derlith, Jr., so built the strong steel frame of the Campanile that cross-bracing is eliminated at alternate stories.
Dancing on a Revolving Floor: New York’s Latest Cabaret Fad
IN order to provide its patrons with sensations that are somewhat out of the ordinary, a well-known New York restaurant has installed a revolving dancing-floor. This circular floor, which is about thirty-five feet in diameter, occupies the center of the main dining-room.
IT is a big undertaking to produce useful and capable men from boys whose opportunities for education have been limited and who are practically without training. Yet that is the task assumed by one of our great telegraph companies. Its messenger boys are to become not merely bearers of dispatches, but men of character.
BY the use of an automatic, animal fire escape just presented by a Western inventor it is possible to clear any size stable of animals in five short seconds. In the operation of this fire escape the element of chance does not enter. It has a positive action, and as all working parts are controlled by gravity there is nothing to get out of order at the critical moment.
Fumigating Has Improved, But Are We Less Afraid of Germs?
Fumigating Tank That Contains a Railway Coach
A Nailless Chair Made by Good Soil, Fresh Air and Sunshine
Handy Instrument for Physicians
TERRIBLE as the submarine seems, it could be made still more terrible if it were propelled by a system simpler than that at present employed. Although no perfect engine has yet been found which is suitable for both surface and underwater propulsion, naval engineers are agreed that were it not for the storage battery the submarine might be made big enough and fast enough to take its place in the battle-line of a high-sea fleet.
CONVENIENCE and the saving of space are of prime importance in city flats and country bungalows. Here is an illustration which shows how comfort was brought to an ugly room that served as both bedroom and living room. The addition of the wall-closet with its drop-shelf provided not only a writing-desk, but a cabinet for bottles and other small objects constantly in demand.
AMONG the aids to the conduct of the war that have been proposed in Germany is the photography of the enemy’s positions by the flight of rockets carrying cameras. The invention is less expensive and can be sent up closer to the enemy without provoking attack than a captive balloon, dirigible or aeroplane.
ACCORDING to the latest statistics available, dated April 20, 1915, the authorized strength of the Regular Army—was 4,833 officers and 87,877 enlisted men, while that of the Philippine Scouts was 182 officers and 5,733 men, thus making a total of 5,015 officers and 93,610 men.
Exit the Mississippi Stern-Wheeler; Enter the Motor-Barge
This Barn Bears a Lesson to Pacifists
“Quiere Leche Hoy?”
A Model of Joel Chandler Harris’ Old Homestead
Washing Logs for Safety
Twitching Muscles by Means of the Electric Current
An Electrically-Lighted Clock
THE old, picturesque stern-wheel Mississippi freighter and passenger boat has a rival in a new type of barge. The first of these boats is two hundred and forty feet long, forty-three feet wide and has a cargo structure two hundred feet long, forty feet wide and twelve feet high.
WHEN a heavy sea is running, one of the glass-covered portholes in the bow of a steamer is often crushed in—an accident which, while seemingly unimportant, has resulted in the foundering of many a ship. Water rushes into the opening at the rate of many gallons a minute.
How Science Has Made the Launching of Dreadnoughts Mechanically Perfect
Keeping Beverages Fresh
Robert Howard Gordon
THE launching of a great battleship involves the problem of releasing a ship from its ways without straining the shell. In the case of such great super-dreadnoughts as the New York and Arizona, the great length and enormous weight of steel necessitate unusual care in calculating the points where the strain can be relieved by additional ways.
IF “Ten-net,” a novel game invented by Halvor Achershaug, of New York, meets with the popularity which is predicted by those who have played it, both indoor and outdoor sports will be forced to look to their laurels. Many different games may be played with the nets patented by the inventor, ranging from a modified form of handball for indoor work to an exciting outdoor game somewhat resembling lacrosse.
Digging Trench for the Tubes in the Bottom of the River
How the Tubes were Sunk
Filling the Tubes with Water to Sink Them
How the Sunk Tubes Were Joined
Pouring Concrete Through Pipes
Making Your Own Boat Repairs Under Water
Submarine Signaling with Sound Waves
Catapulting Seaplanes from Battleships
Burning Cars to Make Money
Howard B. Gates
A TWENTY-story building literally grows out of the ground over night; subways are built beneath our most congested streets and under rivers and we scarcely know they are there until they are ready for operation; our water supply is siphoned under rivers at great depths and runs through the very bowels of the earth in arteries hundreds of miles in length for our convenient use at faucet and hydrant; bridges spring from the opposite banks of our rivers and meet in the center within a fraction of an inch and we talk with our friends across the ocean and continent with perfect ease and understanding.
IN FRANCE, the only country where fencing can be said to flourish, a new system for teaching the use of the foil to blind men has sprung up. Its originator, Georges Dubois, has a method whereby the student is taught to rely upon the sense of touch only.
Making Money Out of Waste Land With a Stream of Water
Purifying Iron in a Vacuum
AN observation apparatus with greater range than the periscope has been constructed by Joseph de Falco, of Vineland, N. J. With it, observations can be made by a submarine without the vessel endangering itself by coming so close to the surface as the present submarine periscope requires.
ONE million dollars is a fortune—at least it seems so to most of us. Yet animal surgery is saving one million dollars a year in New Orleans, a city of about three hundred and fifty thousand population. As New York has fourteen times as many inhabitants as New Orleans it is safe to assume that animal surgery means fourteen million dollars to New York every year.
The Chair-Car—the Latest Development in Stagecoaches
A Sanitary Refreshment Table
A Machine Which Plugs Knot-Holes
Earrings that Denote Widowhood
A Tomahawk Grease-Gun
A Socket-Protecting Knot
Device Prevents Automobiles From Being Stolen
How a Second-Hand Automobile Made a Railroad Pay
Lifting Made Easy
IN an effort to solve the fresh-air problem for city babies several enterprising inventors have devised arrangements whereby youthful Americans can be given all the fresh air they need and given it in perfect safety, at the same time allowing their busy young mothers plenty of time to do housework.
ANY textbook on light will tell you that white light is a composition of rays forming what is known as the spectrum, and ranging from violet and blue through green, yellow and orange to red. There are also rays and colors on each end of the spectrum, for instance, ultra-violet on the violet end, not visible to the human eye.
A Scientifically Designed Train-Announcing Megaphone
Wagon-Loader Resembles Gold-Dredge
Why Can’t We Make Diamonds
A Lace Curtain Protection
Eliminating Pottery Waste
A Fiendish Plant Which Thrives on Cattle
A Wheel-barrow for Canoes
Panama’s Locks Guarded by Chains
Three-Quarters of Humanity Are Deficient in Lung-Capacity
Maud Muller Up to Date
A Continuous Railway Crossing
A Tree Which Serves as a Bridge
The Ozark Float-Boat
MOST people imagine that the first armored ship was the “ironcased frigate” Gloire, launched for the French navy in 1857; yet the Dutch built an armorplated vessel nearly three hundred years earher. That was in 1585, when An twerp was besieged by the Spaniards.
IN this field of 49 baseballs the puzzling proposition is to mark off all but 20 and to leave those 20 balls in such arrangement as to score the greatest possible number of rows, 4 balls to a row. In the diagram it is shown how the balls, lettered from A to K—12 balls— are made to score 5 rows.
SOME corrective must be found for the present poor condition of roads that are already oppressive and promise to become intolerable. As for the work of building or improving roads, the advent of dynamite into this field is reducing both time and labor to a minimum.
SPINNING-TOPS, like toy soldiers and other necessities of boyhood, have existed for many years. Recently, the old standby made from a spool with a peg pushed through the center, has succumbed to more scientific devices. The principle of the gyroscope is frequently used.
Does This Solve the Refilling Problem for Fountain Pens?
A V-SHAPED spring clip is attached to a finger-ring, and is used to hold a pencil in a convenient place so that the user will not have to search for a mislaid pencil constantly and yet leaves the hand free. TO obviate the necessity of removing thegrease cup when it is desired to fill it with grease, an inventor has inserted in the cup a washer which acts as a plunger to force out the grease.
The Construction and Use of a Safe Driving-Box Lifter
A Pipette Attached to a Bottle
Making Dies of Difficult Outline
How to Fit Cables Into Small Terminal Holes
A Set of Jaws for Counter-Boring and Facing
No Corkscrew Needed
How to Keep the Baby in His High-Chair
A Substitute for a Condenser when Making Enlargements
A Wedge as a Burglar-Alarm
An Easy Way to Remove a Broken Chair-Leg
An Improved Darkroom Lamp
How to Send Coins by Mail
A Locomotive Apron Lifter
A SERVICEABLE and durable vise may be made with a few simple tools, at a very small cost. Procure an 8 or IO-in. strap hinge and cut it off along the lines marked A-B in Fig. I. Fasten the hinge, with two small bolts to your workbench or on to a board, which may in turn be fastened to the bench, as in Fig. II.
THE average boy will find it comparatively easy to build a thoroughly satisfactory sailboat, and no difficulty will be experienced if the simple instructions which follow are well understood before undertaking the work. A boat of this flat-bottom or “sharpie” model, is the easiest of all sailing craft to construct, it will be found safe and stable and will show a fair amount of speed with a reasonable spread of sail.
THE bow-drill about to be described will be found a most useful addition to the average amateur's workbench, and although the size of the drills somewhat restrict its field of usefulness, it will be found invaluable in the construction of certain classes of apparatus.
THE subject of damping and “logarithmic decrement” of current and voltage in radio telegraph senders and receivers is often looked upon, by the wireless experimenter, with a certain degree of awe. This is usually because many of the textbooks and articles treat the matter as though it were very complicated and hard to understand; the fact is indeed the contrary, and the matter of damping is not at all difficult to grasp.
An Electromagnetic Rectifier and a Polarized Relay
The Polarised Relay
Inexpensive Stranded Aerial Wire
Automatic Dead-End Switch
Avoiding Grounding in Running Metal Molding from Chandelier Outlets
Audion of Increased Sensitiveness
Constructing a Variable Condenser
How to Make an Electric Horn
Making Coils of Resistance Wire for a Small Electric Stove
Repairing a Burnt-Out Fuse
Substituting a Flashlight for a Door-Bell
Telephone-Line Test-Clips Easily Made
Changing a Telegraph Sounder Into a Relay
A Current Reverser for Small Motors
R. E. Ryberg
THE storage battery has become a necessity in the laboratory of the experimenter and wireless amateur. The problem then becomes one of supplying an efficient means of rectifying the alternating current in the house-lighting mains in order to charge these batteries.
L. J. T., St. Louis, Mo., inquires: Q. I. Some confusion exists in my mind regarding the designs for receiving tuners. Take for example the following: For a receiving tuner to be adjustable to wavelengths from 175 to 4.000 meters, is it preferable to construct two separate tuners or may two small-sized tuners be joined together (in the primary and secondary windings) to receive the longer wavelengths?
RAISING rabbits near a large community is a profitable industry, and it is an enterprise that many schoolboys in America have embarked upon, with returns in money that are indeed out of proportion to the small amount of time and energy necessary for the proper care of the little animals.
HOW often we hear the expression “You should see my bungalow— the plan was original with me and we think it ideal in every way.” Perhaps the plan was “original,” so far as the speaker is concerned, but in reality the writer has never seen a really original bungalow that was a success.
Are mine fields a real defense against submarines? Ships are being torpedoed every day in the mined English Channel and in harbors seemingly impregnable because of the extensive mine fields that guard the entrance. Could this happen in New York Harbor?