EVERY one knows that in time of war harbors are protected by mines through which an enemy cannot easily pass without the risk of destroying himself. Depending on their nature the mines are called “contact” or “shorecontrolled.” As the names indicate, the contact mine explodes as soon as a trigger with which it is provided is actuated by a ship, or a bottle of acid is spilled on a suitable chemical; the shore-controlled mine is exploded electrically from a station at the critical moment determined by observation.
A NEW mechanical caddy for the golfer has been invented by John Deere Cady of Moline, Illinois. It is an ingenious, wheeled holder for golf-sticks, which the player can easily take over the golf course without the assistance of a caddy. Indeed, the caddy can be entirely forgotten, unless the player loses one of his golf balls, when he can call the caddy to his assistance and make him an offer to find the lost ball.
A Measuring Machine More Sensitive Than a Human Being
Lighting the Inside of an Oven
A Mechanical Whip
Welding Soft Metal to Hard
NOVEL camping outfits have, from time to time, been introduced, but it is doubtful if anything more daring and ingenious has been conceived than an automobile with a duck-boat for a top, the invention of G. W. Clark of Glendale, California.
READ the accounts of the battles fought off Heligoland and the Falkland Islands, in which ships protected by heavy side armor were sunk by gun fire at ranges of five miles and the question must occur: What is the good of armor? If twelve and more inches of steel can be penetrated by the fifteen-inch guns of a British battle-cruiser at distances of miles it would seem as if victory in sea engagements is a matter of hitting power rather than of protection.
THE purchasing agent of a large corporation took a night train from Buffalo for Pittsburgh. It was cold and the next morning his face was fairly alive with pain. He concluded that neuralgia had singled him out as a victim. Consultation with a physician resulted in about the same opinion.
Keeping Things Cold in the Automobile Refrigerator
A Record Motor-Truck Load of Barrels
How One Ford Got Up in the World
A “Shoo-Fly” For a Candy Kitchen
A Ticklish Moment
A Protecting Holder for an Open-Faced Watch
Hearing Your Men at Work
Interchangeable Pressing and Steaming Device for Tailors
“Ironing Out” Earthquake Wrinkles in San Francisco
How Automobiles Innocently Break Windows
There’s more to War than Shot and Shell
Refinements in War Motors
The David and the Goliath of the Skies
A Gas Attack Seen from an Aeroplane
New Activities of Military Surgeons
Keeping the Germans from Verdun
What the Battle of Verdun Means to the Townspeople
From the World’s Greatest Battle-Ground
Glimpses of the French Trenches
“Somewhere in France”
The War in the Clouds
Rapid-Fire Guns and Their Victim
Overcoming Difficulties in Albania
On the High Seas with the Battleships
America’s Monument to Her Policy of Unpreparedness
Hairpin Curves on a Mountain Trolley Line
How an Automobile-Engine Tests Water-Mains
THIS seems to be the proper moment to realize how completely the term “aeronaut” has changed its century-old meaning. Until recently only the balloonist might still claim to be a true aeronaut, fearless of the elements, starting anywhere, rising to extreme altitudes and traveling long and far, while the average aviator was confined to his “flying grounds.
AN interesting and practical series of experiments in a field that is new to science has been made at the Massachusetts Institute of Technology by Professor H. A. Everett, for the purpose of determining some of the facts about the propelling power of sails.
DOING in five minutes the same work that formerly took twenty-five minutes to perform, the method of handling rock from subway excavations illustrated herewith is one of the most effective systems ever devised. It is in use at three points along the subway route in New York city.
The Official City Fly-Catcher of Redlands, California
The Five-Wheeled Velocipede
A BIG excavating machine which literally walks to its job is being used by the United States Government on one of the great irrigation projects of the Southwest, and the advantages of this pedestrian accomplishment are many. Most of the machines of this character are built to roll over the ground on wheels, but its movements are necessarily limited, for it dare go only where the ground has been carefully prepared for it.
Splitting Up a Spoken Word for the Voice Typewriter
The Feminine Gender of Preparedness
CONCEIVE an ordinary machine resembling the machines in common office use—full of the customary cog-wheels and crooked levers and variegated springs. It might be an adding machine so far as one can judge by external appearances or a dictaphone or a newfangled cash-register.
HAS your car a Roman nose, or is it pug? Do its ears stand out or lop over? Its eyes —are they far apart or close together, deepset, large, high or low? This is by no means nonsense. It is the method of automobile identification now being taught the two hundred and fifty policemen who guard the outlets of New York city, such as ferries, bridges and main roads.
WHEN Curtiss built the “America” for an intended flight across the Atlantic, he was compelled to design a big machine. The radius of action could be extended only by providing for much fuel. Fuel became the most important freight of the bigger machine.
CARL E. AKELEY of the American Museum of Natural History has evolved a motion-picture camera so novel in its constructional and operaating features that it gives promise of revolutionizing at least one of the diversified fields of motion-picture photography—that of the naturalist and big game hunter.
THE one blot on the beauty of Riverside Drive in New York city has been the tracks of the New York Central, running along the west side of Manhattan Island. For years vigorous protests have been raised against the nuisance, one newspaper referring to the railroad’s right-of-way as “Death Avenue.
IF you could strike all the keys of a piano at once, from the deepest base note to the topmost treble, you would create a medley or cacophony in which it would be impossible to pick out one sound from another. White light is very much like that.
THE young naturalist who lies face downward at the brookside, and with shaded eyes watches the busy life that there has its being, will see, in many places, little masses of small stones or bundles of small sticks, moving on the bottom of quiet pools as though they were alive.
DOES water seek its own level? Yes, with an if—if the water is the same density throughout. If the density of water in two connecting vessels differs, the level of the lighter water will be higher. There are different ways in which density can be affected.
COLOR photography is not new. It has been the goal of ambitious inventors ever since scientists really understood something of the nature of light. Nearly all methods of making colored photographs are long and expensive. Though beautiful results were in some cases secured, only an able scientist could manipulate the apparatus, time the exposures, and keep track of the dozens of little things all-essential to securing satisfactory results.
AGAYLY decorated platform on which are seated the graduates, faculty, speaker and other invited guests; a lengthy program of music, orations and addresses, probably all cut to order and sugar-coated for the occasion; an award of sheepskins and a benediction—this, in brief, constitutes the stereotyped graduation ceremony of most colleges and schools.
WHEN starting the motor, close any auxiliary air valves and hold the hand over the air inlet of the carburetor so as to draw in a richer mixture, otherwise the mixture may be too weak to start the motor. If the mixture seems to be rich enough, the engine may start off if a little lubricating oil is let into the cylinder which will make the compression better.
A FAN motor is enclosed in a spherical shell, so that no moving parts are visible. The current of air generated by the fan is directed through a nozzle which is covered by a wire mesh as a protective measure. The air is forced out in a parallel current, and blown in any desired direction.
CLEAR a place for the fire, so that it cannot spread. One of the best ways is to dig a ring around it, so that damp earth interrupts the dry grass or dead leaves which may be present. See that the flame will not scorch trees. Never throw away a match—not even a burnt one or a wet one.
THE usual method of patching a boiler cannot be relied upon for high efficiency. Suppose there is need of a patch at the check-valve hole of a locomotive-boiler. The radial cracks, most often along the length of the plate, start out from the hole.
WHEN replacing the piston in the cylinder of a gasoline engine, after it has been taken apart, it is usually difficult to get the compressionrings to enter the bore because they have to be sprung shut one at a time in order to slide in. A new device has been designed to obviate this difficulty.
How to Build and Fly the Blue Hill Box, Malay Box Combination and Tetrahedral Cell Kites
The Malay Box Combination
The Tetrahedral Cell
A Few Words About Flying
An Emergency Fountain-Pen
Making a Two-Fuse Switchblock
H. S. Rinker
HAVING progressed thus far, variety can be introduced by making some Blue Hill box-kites. These are named after the Blue Hill Weather Observatory, Massachusetts, where they were originated. They look like Fig. 16. Make 4 sticks ½ in. square, but otherwise proceed as described for the Malay kite.
The Construction of an Improved High-Tension Audion Battery
Rejuvenating Electric Lamps
An Exciter for Electroscopes
A Wet Battery From a Dry One
Interference of Lighting Circuit by Static Electricity
How to Photograph Wild Animals
Converting a Key-socket Into a Simple Pull-socket
Electric Striking Mechanism for Mission Clocks
A Simple Anchor-Gap
Making a Mechanical Interrupter
Temporary Variable Condenser
A Delicate Crystal Detector
Radio in the Far South
A Lead-in Connector
An Unusual Code Letter
Mounting a Rotary-Gap
Greater Speed in Wireless Receiving
Receiving Undamped Oscillations
An Electrically Operated Device for Lighting Gas
A Model Electrical Hammer
How to Make an Attachment-Plug
How to Make an Electric Shaving-Mug
Using Cartridge Shells for Electrical Contacts
The Best Crystal Detectors
Testing Electric Lamps Quickly
IN the early days when the audion as a detector was used only to a limited extent, it was generally considered that on account of the extremely high resistance of the path through the telephones and across the vacuum in the bulb, the high-tension battery used to supply this circuit must be good for many years’ work.
The information you request concerning the operation of wireless telegraph equipment is mainly covered in the various textbooks of wireless telegraphy, but not specifically taken up in any particular one. The necessary tests for determining the condition of radio telegraphic apparatus are so well understood by those engaged in the work that the authors have neglected to take up this phase of the subject.
A VERY serviceable washing-machine can be made from an old barrel-churn whose capacity is from fifteen to twenty-five gallons. First construct, of heavy galvanized-iron, a cylinder about 30 ins. long and of the same diameter as the head of the churn.
INSTEAD of a workbasket, with spools of thread, buttons, scissors, embroidery, hoops, etc., all crowded into a small space, a screen can be used, which has a definite place for every article used in sewing. The spools of thread are kept on brass pegs; the silks in one place and the cottons in another.
A VEHICLE body mounted on springs has a constant vertical movement, the amplitude of the motion being dependent on two things: first, the speed of the vehicle, and, second, the inequalities of the road. The weightmobile is a piece of mechanism designed to convert oscillations into a continuous rectilinear movement, and thus greatly assist in propelling any moving body on wheels.
MORE than sixty per cent of the American motor-trucks listed on the market at the present time are worm-driven. Last year twenty-two per cent of the trucks listed were wormdriven, thus showing that the popularity of this form of drive has increased.
OF course you recognize Delia, the motor duck, which appeared in our March issue. We want more photographs of equally interesting inventions, and we will pay for them at the rate of $3.00 each. The more daring the invention, the better for us.