to the chart of the town, shows the point where the shell fired along trajectory D has burst. Errors in gunnery are thus corrected by wireless telegraphic signals to the firing ship.

Similarly by observing times of report of gun in ship 3, ships 1 and 2 can learn their position relative to that vessel.

In Fig. 3, L and L, are signalling stations on shore. S, is a friendly ship approaching a quay. The base-line L L, is known. L and L,, at intervals of 30 seconds, sound a signal, at the same time notifying the moment of sounding to S, by Hertzian waves. The distances S,L

marked by the black lines, thus enabling her to enter the harbor.

Colossal Floral Clock

AN IMMENSE FLORAL CLOCK,

which, by a masterly interior mechanism, is made to keep correct time, is one of the most interesting attractions at the St. Louis World's Fair. The dial of the clock is 100 feet in diameter. The minute hand is 50 feet long and 6 feet wide.

and S,L, are thus ascertained, and the ship learns her position. Similar observations taken at S2, S3, S4, S, give the dotted triangles, and bring the vessel safely in. In war time the base-line is given by two moored cruisers R R, which, by the same method of signals, give the ship the series of triangles

*The numbers and letters on the telemeter correspond with the ships and distances observed.

DOUBLE LIGHTNING FLASH. An unusual coincidence caught by the camera.

picture during a thunderstorm, and, after waiting for nearly an hour and obtaining only specimens of sheet lightning, noted a flash which began near the center of the line of vision and shot downward. As he was about to close the shutter of the lens, he was surprised to note another flash which extended from right to left nearly meeting the vertical bolt. He left the shutter open with the result that appears in the picture. It is probably the only case on record where two flashes of lightning have ever been photographed in such quick succession, or have assumed such a peculiar shape.

Mr. Locke has named his invention the "Locke Adder;" but it can also multiply, subtract, divide, and perform all other kinds of arithmetical work in about onefourth the time taken by the most skilled accountant. There is no need of an expert accountant to do the work of this machine. So far as the calculations are concerned, he might be discharged at once, and the office boy could be taught to do his work in a day. Thus machinery is not only doing away with manual labor, but it is beginning to take the place of brains.

With the Locke adder, calculating of any kind becomes purely a mechanical process. Thinking is not necessary, more than is required to place the fingers on the numbers indicated in the problem one has to solve. All the living accountant has to do is place his fingers on the keys. The machine-the inanimate accountant-will do the rest, quicker by far than the human accountant, and it will never make the slightest mistake. It is impossible for the machine to err.

The machine, invented by man, that can perform all these things, will not weigh a third as much as the best human accountant's brain. It is a very small contrivance-weighing just 7 ounceswhich can be placed in a corner of the desk, or used as a paper weight, or carried in the pocket. Its ability never becomes impaired from intemperance or overwork, it is honest, and ever in readiness to solve the most intricate problems.

The adder consists of a frame or casing containing a series of parallel bars,

the central portions of which are exposed while the ends are covered by plates. There are two kinds of bars-the stationary guide bars and the sliding bars. The guide bars, on their upper surface,. have the numerals 1 to 9 equally spaced in regular sequence from left to right. Between the guide bars, and adapted to move from right to left or left to right, are the sliding bars. Each of these bars is about twice as long as the exposed portion of the guide bars, and has on its upper surface a series of projections or knobs, spaced at the same intervals as the numerals on the guide bars. When these bars are moved to the right or left, the figures indicating results appear in the U-shaped openings at the right of the operating section. The result figures are read down, or toward the operator, and are in plain sight, yet so placed that there is no danger of confusing them with the numerals on the guide bars.

Different sliding bars represent different orders in the decimal notation-the lowest or nearest slide being units, the next tens, the next hundreds, and so on

the top bar being hundreds of millions. Guide words and figures on the plates make everything plain to the beginner.

JOSEPH PROBST IN HIS LIFE SUIT.

Joseph Probst of Geneva, Switzerland.

After him it is named the Probst Life Suit. A person can don the suit, it is claimed, as quickly as he can place an ordinary life belt around him; and when

Two-LEGGED CATS.

Their tails partially serve the purpose of hind legs.

as a cruise in a sailing vessel. The suit is of India rubber and opens in the center. On the outside are air-tight compartments large enough to carry all necessary supplies, including an instrument to scare away pillaging fish. The suit rests lightly on the waves almost one half of it being above water. The wearer may lie down or stand up in it.

Biped Cats

THESE KITTENS are very much like other kittens with the exception that they have no hind legs. Out of a litter of seven, they were born with but four legs between them. However, this makes but very little difference, as they are able to support themselves on their tails, and can get about without difficulty and very quickly. They are now several months old, and as active and healthy as the average feline. Mrs. Taylor, their owner, is a colored woman residing in Baltimore. She is very proud of her pets, and has refused an offer of $10 each for them.

A Hurricane's Path

THIS PICTURE is a forcible reminder of what the wind can do in the space of five minutes. It is a view of the track of a hurricane which passed over a part of the city of Baltimore. Directly in

the path of the hurricane stood a massive brick machine shop used by a railroad company for making repairs to its cars. It was literally filled with heavy boring tools, power lathes, power hammers, and other equipment. The building was constructed of a framework of hardwood beams 18 inches square, and the outer brick walls were nearly three feet thick. Within actually five minutes after the tornado struck the building, this scene of ruin was presented, the portion in the path of the storm being literally cut out, leaving the ends of the building intact,

enal popularity that the gasoline launch has attained. One of the most remarkable of these new motors comes from Buffalo, N. Y., where it is manufactured by the Buffalo Gasoline Motor Company. All the four cylinders of this motor are fed with a carburettor through one inlet casting. With all the motors, are furnished a float-feed carburettor, which is attached directly to the motor and contains a throttle for gauging the amount of gasified vapor admitted to the cylinders. Attached to this is a lever of neat design, located near the sparker lever, so that the sparking and throttling are conveniently and easily operated.

The new motors contain solid, onepiece, steel-forged crank shafts and mechanically operated inlet valves. This insures a regular supply, which in turn gives a steady, measured impulse and regular speed. This is a wonderful improvement over the troublesome cranking motor which would not start because the inlet valves were stuck to the seats. All motors of this new type are equipped

New Type Marine Motors

MARINE MOTORING has sprung

ARINE MOTORING has sprung into unexpected prominence recently as the result of improved machinery that makes the diversion more enjoyable and safer than its early advocates ever anticipated. What the automobile is to the land, the motor launch now is to the water. But the danger is no greater and the sport is declared to be more healthful and exhilarating than automobiling, while the cost of outfit and supplies is less.

New style motors, doing away with the many inconveniences of the old-type machines, are responsible for the phenom

NEW MARINE GASOLINE MOTOR.

with metal-enclosed bases, with sufficiently enlarged detachable panels, so that access to all parts is easy. Solid steel-forged valves are used, and are accurately ground to a good seat. Five heavy bearings in the base of the motor assure firm journals for the crank shaft. Double-lock nuts and split keys hold these bearing caps in proper place, and consequently there is no trouble from lost nuts and loose bearings. The motors are completely water-jacketed, including head and valves. There is no packing except on the water-jacket plate; there is never any trouble with this because there is no pressure to blow it out. The

sparker plugs on top of the motors have double-seated ground joints, absolutely compression tight. The steel-forged cams, operating inlet and outlet valves, are all on one shaft, and are pinned on in order to insure opening of the valve at absolutely the right time. The valve plugs are just above the valves in the center. Should any valve leak, it can be taken out immediately, reground, replaced, and made ready to run in a very short time.

The illustration shows a two-cylinder 71⁄2 horse-power balanced motor of this type. It has a bore of 41⁄2 inches; stroke, 5 inches; weight, 395 pounds without reverse gear, or 545 pounds with bed and reverse gear; diameter of fly wheel, 16 inches; diameter of shaft, 13% inches. The speed can be changed instantly at the will of the operator from, say, 600 normal to 1,000 maximum. The length of the motor over all is but 15 inches, exclusive of 6 inches of shaft on both ends. The foundation is but 13% inches long, and the width is 141⁄2 inches.

Universal Square and Protractor

two triangles, and supplies in addition several valuable requirements. It is primarily a square of large range and light weight, in thorough control from a knob located near its center of gravity. Its arms are secured at right angles to each other under an aluminum plate, and are thus easily adjusted, repaired, or replaced. As usually made, it has transparent celluloid edges, but, if desired, the inner edges are provided with accurate scales turned down to meet the paper with a very slight thickness of ruling edges, thus rendering practical a large proportion of the petty measurements of a drawing without the use of a separate scale.

The drawing of square, hexagonal, and wood screw heads is provided for in the central portion of the instrument which is a transparent celluloid plate having a large arc, bevelled on the edge and graduated to degrees.

The instrument measures all angles from horizontal or perpendicular lines on the drawing, and also provides for laying them off. For the drawing of odd angle work, including structural designs, special projections, cams, etc., it is pe

out in recent years for the specific requirements of mechanical draftsmen, a form of square has just appeared that is peculiarly adapted to the rapid and easy performance of that class of work. Machine designers and structural draftsmen will generally recognize that, except for bolt heads and short work, ruling edges of 60 degrees' and 45 degrees' slope are seldom required, but for this purpose they are in almost constant demand, while, on the other hand, the presence of the two ordinary 60- and 45-degree triangles on the drawing board is a continual nuisance.

The ingenious instrument referred to― the invention of Mr. Duane J. Kelsey, New Haven, Conn.-does away with the

tachment to which the square is clamped. by a few turns of the knob. This base has a vernier limb reading to 10°, and rides against the T-square on all parts of the board, providing for lines at any angle and their perpendiculars, at one setting. Angle work is thus made more rapid and easy than square work.

small

Another convenience of no amount is the avoidance of shadows when working by artificial light, as one side or the other of each arm is always in more or less direct light. The polished metal plates and trimmings give the instrument a substantial and pleasing appearance, and its manipulation is as easy as that of triangles of much smaller range.