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above the ground, is a heavy steel cable. Below the balloon is suspended a car for the conveyance of passengers to the top of the peak. The descent is caused by the pressure of water, which is poured into a large tank at the upper end of the road and serves as ballast on the return trip. Ten passengers may be carried at a time and the speed of the car, in either direction, is regulated by the conductor.

Install Mechanical

Slate Pickers
FROM Pennsylvania comes the news

that one branch of child-labor may be abolished. In the coal mine regions of Pennsylvania are employed some 24,

000 breaker boys, who pick out the slate CORNER IN LIVING ROOM OF THE WASHINGTON Car.

from the coal at the collieries. The

Delaware & Hudson Coal Company has Water and oil for the gasoline engine installed a mechanical slate picker in its which propels the house-auto are carried colliery at Wilkes-Barre and the report in large tanks under the floor.

is that it works successfully. Twelve The house-auto has been completed boys and the mechanical spiral slate just in time for Mr. Washington's vaca- pickers now take the place of the three tion, which he will spend, with his wife,

hundred boys who would be required in in driving across country from Chicago a plant of that size under the old régime. to Portland, Maine.

The company will probably place these Just how popular the house-auto will mechanical pickers in all its other plants. become is a problem for the future. It would seem, however, that tourists who are familiar with the accommodations offered by country hotels might easily prefer to live as well as travel in their automobiles. At any rate, Mr. Washington has added another to the long list of "firsts," won by his distinguished ancestor.

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Running a Railroad

by Balloon RUT U'NNING up the side of a mountain,

near Salzburg, Germany, is the most unique railroad in the world. A single steel rail has been laid from the base to the top of the mountain, and over it runs a sliding steel shoe. Between this shoe and a big hydrogen gas balloon, which floats about ferty feet

A GROUP OF Breaker Boys EMPLOYED IN PENNSYLVANIA

COLLIERIES. There are scme 24,000 of them now at work picking

slate from the coal.

Cars Collide for Fun As might be expected each car is con'HE latest thing in the freak amuse

structed very solidly to withstand the THE ment line for summer resorts is

strain caused by the continual impact, the known as the Leap Frog Railway. Its

steel framework alone weighing fourteen

tons. name describes exactly what this re

Each car is also provided with markable railway does. Two electric

motors of sixty horse power, which are cars, each carrying 32 to 40 comfortably

sufficient to drive the car, which makes seated passengers, meet in a head-on col

the leap, up the incline. lision, while traveling along a single track. Instead of a smash-up, with its consequent horror of torn and mangled To Trap Automobilists human beings, that would ordinarily ensue, one of these cars easily and grace

"HE zealous sheriffs of suburban THE

towns now have a friend which gives fully glides up a set of curved rails with which the roof of the other car is pro

them legal evidence for use against speedvided, passes over it and slides down to the track beyond.

The Leap Frog Railway is located in Dreamland Park, Coney Island, on a pier running out into the ocean for 500 feet. The track is just long enough to allow the cars to develop a speed of about

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LEAP FROG RAILWAY AT CONEY ISLAND.

eight miles an hour, and as one is started ing motorists. This able assistant is in the at one end and a second at the other, they form of a time-recording camera. The are calculated to meet at the center of shutters will give an exposure of one the track. As the photograph shows, one-thousandth of a second. At the same however, instead of smashing together, time that a photograph is taken of the one jumps over the other, for each is pro- flying automobile and its occupants, a vided with a little railroad in itself. This picture is made of the face of a watch, is known as an overswitch or super-im- thus giving a record of the exact time posed track. The overswitch is provided the photo was made. In the use of this with what are called pilot rails, which arrangement a trap is measured out and have an adjustable connection with the officers placed at each end with these railway on which the car moves. They cameras. The photographs of the car are so arranged that at the moment of and its driver, with indisputable proof of collision the wheels of the car which is to the time in which he made the measured mount the other, pass from the main distance, may then be produced in court track upon the overswitch and it passes as competent evidence against the above without even a jar.

chauffeur.

Gold Coin and Bullion Messages to Trains THE mass of metal by the side of the A ingenious device for delivering

pile of coin is a bar of Alaska gold. messages to moving trains has been The pile of coin consists of American $10 adopted by the Baltimore & Ohio Ry. It gold pieces. Here is an interesting prob- consists of a long forked stick, with clips lem for the mathematician to solve: at the ends; a cord loop is hung on these How many of these coins could be made fingers which grasp it so tightly that a from the gold bar? This problem is not gale of wind cannot blow it off, but the as hard to solve as it seems, for the pile trainman may slip it off with ease. To of coins reaches to just one-quarter of this cord is attached the messages. The

stick is held out to the train with the fork pointing in the way the train is

going. The trainman simply holds out Wells Fargo & Co. Express

his arm and allows his hand to come between the forks of the stick and the string. The cord is loosened immediately and he carries it with the message attached away with him on the speeding train.

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To Protect Chauffeurs
A NEW speedometer for motorists is

now on the market, which not only gives the rate of speed per hour and the number of minutes to the mile, but can be set at any given speed, so that when that speed is exceeded a buzzer announces the fact to the driver. With this device in use, a chauffeur can set the speedometer at the limit of speed allowed in the country where he is traveling, and, as soon as the limit is exceeded, he will be warned of the fact.

ALASKAN GOLD BRICK.

To Measure Tiny Space
AN apparatus for measuring the sev-

enty-millionth part of an inch has been made by Dr. P. Shaw, of Nottingham University, England. It works upon the principle of electric touch, and consists of a fine micrometer screw and six

levers. The apparatus is so sensitive and the height of the bar. Consequently 100

delicate that it is impossible to manipuof the $10 pieces would equal its length, late it before an audience. It is hung by and 200 of them would make two piles of rubber bands, covered with thick felt, and the same height. As the thickness of the must be worked at dead of night, when bar is but a little more than the diameter there is no traffic or factory working. of the coin, but a small amount of gold The smallest distance that this mechanism would be left over after melting the bar measures is about the distance between a into 200 coins. As a matter of fact the solid and a liquid molecule. Dr. Shaw's bar weighs just 108 ounces.

invention was first made in 1900, but its American $10 gold piece weighs 258 great improvement of late has made it the grains, a bar of this size is equal to about wonder of physicists throughout the 201 gold pieces worth a little over $2,000. world.

As an

Steel Conveyor Belt PROBABLY the longest steel conveyor

belt ever made is that shown in the accompanying cut. It is 97 feet long, 24 inches wide, and one-half. inch thick,

arating the two lakes, so that the whole journey is like a trip up and down an inclined railway. The diminutive train is made up of a little engine—just the size of two plug hats,” it has been described-a home-made baggage car, and one of the old Toronto street-cars for a passenger car.

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Collapsing Fire Escape
A NEW YORK inventor has recently

patented an ingenious fire escape, which is illustrated herewith. It consists

of a hollow tube made of strips of an STEEL BELT-CONVEYOR IN PROCESS OF CONSTRUCTION.

incombustible material. This collapses

when not in use so as to take up very and was made for a mining company of little room, but when in use it will hang Victor, Colorado, to be used instead of a from a window like an ordinary rope and less durable rubber belt in conveying ore will stretch out under the weight of the from one point to another.

The ma

person using it. The surface is rough terial used was strands of old flat hoist- enough to allow a good grip and the ing rope. The belt is spliced endless, pressure of the hands on the escape

forms the splice going clear round the belt. a kind of shoulder so that the hands In the cut, one portion is shown finished, cannot slip. As it is hollow, a circulation another part half-finished, while in the remainder the strands are still hanging loose.-E. J. CROCKER.

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Killed by Black Fish scopical examination, undergoes some

sort of union with the fibrous substance, THE 'HE bay of Santa Catalina, on the as no traces of sugar crystals are found

coast of California, is noted not only after the process is completed. The for the number, but the size, of the wood is then withdrawn from the boiler, whales which frequent it. There are and dried in an oven, which is regulated times when schools of fifty or more can to different degrees of temperature, debe plainly seen from the land sporting in pending upon the nature of the material its waters They are attacked at times submitted to treatment. It is claimed by what are known as the whale killer, that wood thus treated is no longer pora large black fish, which has a bony saw ous, can be worked without shrinking or attached to the snout. When a fight cracking, and is permanently protected occurs between a black fish and the against decay.

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whale, the latter defends itself by striking Concrete Pipe Line its smaller adversary with its flukes, sametimes killing it. Usually however

Usually however A CONCRETE aqueduct recently the whale is the victim. The one shown

completed at Cambridge, Mass., in the illustration died as the result of

affords a remarkable example of the wounds made by the black fish and growing tendency to replace iron, brick, floated into shallow water where it was clay tile, and other materials of construcfastened to ropes and pulled upon the

tion in the building of waterways with beach with horses, to be cut up for the concrete, and thereby to secure permablubber and bone which it contained. nency. The new conduit, which is said

to be the first of its kind in this country,

is 21. miles long and 6 feet in diameter, Preserving Wood With

and is designed to sustain any pressure. Sugar

It replaces an old iron pipe line. THE "HE latest method of preserving wood In this connection it may be interest

is to treat it with a solution of sugar. ing to note that the Syracuse (New The material to be treated is put into a York) University contemplates establishcage, and the latter plunged into a boiler, ing a complete course upon cementing which is then closed, and a solution of and concrete construction, for which a beet sugar introduced. The liquid pene- new building is now being erected, to be trates the pores of the wood, and, as devoted exclusively to this branch of inwould appear from the results of micro- struction.

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