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Smallest Dry-Dock THE great giant floating dry-dock

Dewey, built by the United States Government and sent to the Philippines, is said to be the largest floating dry-dock, it being large enough to take in two war vessels at once. It is interesting, by way of contrast, to see a photo of what is probably the smallest of the floating drydock family. This midget, shown in the accompanying cut, is moored in the Chicago river and owned by the Great Lakes Towing Company, and is used in repairing tugs on the river.-W. Hild.

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Rails Can't Spread TO reduce the number of wrecks on 1 railroads and thereby save many lives, is the function of the Musgrove railfastener and protector, invented by Robert G. Musgrove, of Jackson, Miss. The device is intended to be placed at the

the great strain ordinarily imposed on the outer rail, which often results in its splitting or turning, is borne in part, under this new method, by the inner rail. Furthermore, creeping is obviated, and fish-plates and angle-bars are dispensed with. The accompanying illustrations will give some idea of the way the device is constructed and the manner in which it is placed in operation. In view of the frequency of railway accidents, all such preventives are worthy of careful study.


Displaces Celluloid


FARLAND, who is stationed at

Reichenberg, Bohemia, reports that a meeting ends of the rails to prevent their substitute for celluloid has been discovspreading, sinking, or warping. The ered by a Gablontz experimenter. The present mode of fastening the rails is new material is durable and cheap, costmerely to lay them on ties, and drive in ing but little more than glass. spikes at intervals of twelve or fourteen inches. It is almost impossible for such a track to resist for any length of time the heavy pounding of the great mogul engines and trains of freight cars.

The new invention supports the rails and reinforces them at each end as well. Moreover, it is claimed that at curves



weight must naturally seek the water,
quickly force the boat back into position.

Self-Bailing Lifeboat THE self-righting, self-bailing boat

1 herewith illustrated is one of a number used in the United States Life-Saving Service. Possessing great strength and buoyancy, and being very difficult to capsize, its superiority over the ordinary lifeboat for long trips is at once evident.

In the floor of the boat, which is so placed as to be on a level with the water when manned, are several openings, each connecting by a metal tube with an opening in the bottom. As water cannot rise

Clock Flashes Signals

T precisely three minutes to nine o every evening, look for an interesting sight if you go to Philadelphia. The time is to be flashed for a distance of thirty miles by a circle of lights placed on the City Hall tower, just beneath the feet of the great statue of William Penn


SELF-RIGHTING AND SELF-BAILING LIFEBOAT. The three openings on each side of the keel are part of the self-bailing device, and through them the water that

has been shipped is emptied.

above its own level, and as each tube is which surmounts it. On clear nights resclosed at the floor level by a valve which idents of remote suburbs can plainly see opens downward, no water can pass up the lights on the tower, and these suburinto the boat, while any dashing in from banites will watch for the extinguishing above is at once shipped through the of the lights at three minutes before nine tubes. So quickly is this accomplished, o'clock. At nine to the dot, the lights that a full boat can empty itself in about will blaze again, so that anyone setting half a minute.

the chronometer by the appearance of In order to procure the self-righting these beacons will have the exact Washquality, each is furnished with a heavy ington time to the second. iron keel, and well provided with ballast. This is only one of many unique featIf overturned, it is impossible for the ures of this interesting timepiece. For boat to remain so, on account of the ele- years no satisfactory method could be vated air chambers in the bow and stern; found to overcome the difficulties due to and as it rolls upon one side, the ballast high winds and the retarding effect of and the iron keel, which by their own snow and sleet. It was determined at

signals are fiashed.

last to install the pneumatic system, which is the latest development in the science of marking time. The motive power for the clock is compressed air, the mechanism being divided into four distinct parts—the air-compressor, the master clock, the dials, and the dial mechanism. Two motors are at work in the tower, supplying the air-pressure, the air being forced by an electric air-pump into a tank of 193 gallons' capacity. To avoid the stopping of the clock through the motors failing in their duty, two water motors are kept in constant connection with the air-compressor, so that should anything happen to the regular machines these auxiliaries would automatically take up the work.

The great dials seen from the street below are merely the indicators of the time. The clock itself is a very small affair. The case is air-tight and dust-proof. The movement, hand-made and jeweled throughout, required two years to produce. The master clock is wound once

City Hall Tower, PhiladELPHIA, PA.

Showing dials of the great clock from which electric in thirty days; the auxiliary clock, once in eight days. The greatest care is taken to preserve uniform temperature within Once every minute the clock opens the the case. A pneumatic thermostat con- valve which admits compressed air to the trols an electric heater, thus ensuring no tubes connected with the gears, and imgreater variation than two degrees mediately closes it again, the impulse throughout the entire year.

moving the minute hand one half-minute, and the release of the air causing the hand to move the other half-minute. The altitude at which the clock is placed, 361 . feet 172 inches to center of dials from the ground, made it necessary to provide against high wind pressure. To effect this, heavy trussed steel-framed bracing is placed back of each dial, to which the dial frames are bolted. The lamps are lighted and extinguished automatically by the action of the master clock.

Instead of the usual Roman numerals, which could not be distinguished from the street, the figures are indicated on the dials by plain plates 3 feet 2 inches long and 14 inches broad for the III, VI, IX, and XII, the other hour plates being 13 inches wides. The hands of the dials are framed of steel, and encased in copper. The axle turns on ball bearings. The length of the minute hand is 10 feet 8 inches; of the hour hand, 9 feet. The

weight of the former is 225 pounds; of MASTER CLOCK (AT RIGHT) AND AUXILIARY CLOCK (AT LEFT). In tower of City Hall, Philadelphia, Pa.

the latter, 175 pounds.


Upstairs With the Editors

T HE New Year is almost here," and fascinating and all that sort of

remarked the Doctor of Phil- thing." The Technical Editor sometimes osophy in his sententious way. gets sarcastic.

"So is quitting*time," whis- “I'm ready for you on that point," pered the Office Boy, with a stolen glance cried the H. I. E., springing up from his as his second-hand Ingersoll.

chair. "And I'm wondering," went on the “Pussy at the rat hole!" whispered the dignified Doctor, without noticing the in- Office Boy. terruption, “what changes we'd better “Perhaps you've heard of one Jack make in the magazine?".

London, the famous novelist?" the H. I. "Well," answered the Human Interest E. went on, scornfully. “And you'll adEditor, picking up a clipping from his mit he really ought to know when a magdesk, “let's see, first, what we've accom- azine is entertaining, won't you? Here's plished during the present year. Are we a paragraph from a letter signed by Mr. on the right track? Does the idea be- London, which came in, also, in this hind this magazine meet the approval of morning's mail: the hundred million people who are the “I have just seen my first copy of the real editors of all the magazines? Here's TECHNICAL WORLD MAGAZINE. There's a clipping which came in this morning : nothing like it. I want more, and I can't One of the very best publications produced in

wait for it to come month by month. Enthis country is THE TECHNICAL WORLD closed please find check for $3, for which MAGAZINE, published in Chicago. It is de send me every copy of the magazine voted to reliable information, told in an enter

which has been issued.” taining way, with profuse and splendid illustra

"He-u-u!” The Technical Editor tions. No foolish stories; no foolish discussions. Hundreds of publications are received at this whistled sharply to express his appreciaoffice; none of them are welcomed more than tion of Mr. London's hearty compliment.

"Well! well! well! well! So now, I supthis is not an advertisement, it is an honest tribute to a particularly useful and worthy pub

pose, we've reached the limit. We are lication-a publication that should be widely the best ever, and there is no chance for read because of the valuable information it future improvement ?". contains.

“The best way to show that we de“What's that from?" asked the Doctor serve such magnificent appreciation,”

"From the Atchison (Kan.) Globe. said the Doctor, sagely, “is not to indulge There is no paper anywhere which is in vain self-flattery, but rather to strain more widely quoted. And there are few every energy to make a good magazine a men whose good opinion is worth more better one." than that of its editor, E. W. Howe. You “How's that for a bunch of language?" remember the sensation caused a few whispered the Office Boy.

ago by his novel, “The Story of a "We'll do that,” said the H. I. E. Country Town?” Mr. Howe is mighty "Haven't we made arrangements already close to the people, and he is, besides, a that practically insure an improvement of competent judge of literary quality. 100 per cent in the magazine for 1907 ?" That's why this little appreciation is a "You've made arrangements to spend proud thing to have in the office."

a lot of money,” declared the Business “Howe says it's full of information,” Manager, who came in, just then, looking put in the Technical Editor. “I thought particularly severe. “Here are photograwe were trying to make it entertaining phers going half way 'round the world





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