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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 dis-. tinct 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 in thirty days; the auxiliary clock, once. in eight days. The greatest care is taken to preserve uniform temperature within the case. A pneumatic thermostat controls an electric heater, thus ensuring no greater variation than two degrees throughout the entire year.

CITY HALL TOWER, PHILADELPHIA, PA. Showing dials of the great clock from which electric signals are flashed.

Once every minute the clock opens the valve which admits compressed air to the tubes connected with the gears, and immediately closes it again, the impulse 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 11⁄2 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

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MASTER CLOCK (AT RIGHT) AND AUXILIARY CLOCK (AT LEFT). Weight of the former is 225 pounds; of

In tower of City Hall, Philadelphia, Pa.

the latter, 175 pounds.

"T

Upstairs With the Editors

HE New Year is almost here," remarked the Doctor of Philosophy in his sententious way. "So is quitting time," whispered the Office Boy, with a stolen glance as his second-hand Ingersoll.

"And I'm wondering," went on the dignified Doctor, without noticing the interruption, "what changes we'd better make in the magazine?"

"Well," answered the Human Interest Editor, picking up a clipping from his desk, "let's see, first, what we've accomplished during the present year. Are we on the right track? Does the idea behind this magazine meet the approval of the hundred million people who are the real editors of all the magazines? Here's a clipping which came in this morning:

One of the very best publications produced in this country is THE TECHNICAL WORLD MAGAZINE, published in Chicago. It is devoted to reliable information, told in an entertaining way, with profuse and splendid illustrations. No foolish stories; no foolish discussions. Hundreds of publications are received at this office; none of them are welcomed more than THE TECHNICAL WORLD MAGAZINE. And this is not an advertisement, it is an honest tribute to a particularly useful and worthy publication-a publication that should be widely read because of the valuable information it contains.

"What's that from?" asked the Doctor. "From the Atchison (Kan.) Globe. There is no paper anywhere which is more widely quoted. And there are few men whose good opinion is worth more than that of its editor, E. W. Howe. You remember the sensation caused a few years ago by his novel, "The Story of a Country Town?" Mr. Howe is mighty close to the people, and he is, besides, a competent judge of literary quality. That's why this little appreciation is a proud thing to have in the office."

"Howe says it's full of information," put in the Technical Editor. "I thought we were trying to make it entertaining

and fascinating and all that sort of thing." The Technical Editor sometimes gets sarcastic.

"I'm ready for you on that point," cried the H. I. E., springing up from his chair.

"Pussy at the rat hole!" whispered the Office Boy.

"Perhaps you've heard of one Jack London, the famous novelist?" the H. I. E. went on, scornfully. "And you'll admit he really ought to know when a magazine is entertaining, won't you? Here's a paragraph from a letter signed by Mr. London, which came in, also, in this morning's mail:

"I have just seen my first copy of the TECHNICAL WORLD MAGAZINE. There's nothing like it. I want more, and I can't wait for it to come month by month. Enclosed please find check for $3, for which send me every copy of the magazine which has been issued."

"He-u-u!" The Technical Editor whistled sharply to express his appreciation of Mr. London's hearty compliment. "Well! well! well! well! So now, I suppose, we've reached the limit. We are the best ever, and there is no chance for future improvement?"

"The best way to show that we deserve such magnificent appreciation," said the Doctor, sagely, "is not to indulge in vain self-flattery, but rather to strain every energy to make a good magazine a better one."

"How's that for a bunch of language?" whispered the Office Boy.

"We'll do that," said the II. I. E. "Haven't we made arrangements already that practically insure an improvement of 100 per cent in the magazine for 1907?"

"You've made arrangements to spend a lot of money," declared the Business Manager, who came in, just then, looking particularly severe. "Here are photographers going half way 'round the world

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Mention Technical World Magazine

UPSTAIRS WITH THE to take pictures, for one thing. And you are paying higher prices to writers almost every month."

"Next month it will be larger still," answered the H. I. E. "We've got to keep this magazine ahead of the field. And we're going to print in two colors, too. That will add more to the bill. The best, most entertaining, and most valuable material, the most striking and remarkable photographs, all printed in the most beautiful way possible, are what we owe to our 135,000 enthusiastic subscribers. I don't believe any other publication ever acquired well on to 150,000 warm friends in the short space of two years. We've got a wonderful ideal before us, too-a vision of the time when every article shall be as interesting as a novel by Dumas, as inspiring as a trumpet-call, and as valuable as the bank book of the Standard Oil Company. We've got to have big men to write that kind of articles."

"But where is all the money to come from? It isn't fair to ask our adver

EDITORS (Concluded)

tisers to pay for the whole thing," said the Business Manager.

"Then raise the price to subscribers," declared the H. I. E. "If we give our readers twenty cents' worth, they should be glad to pay fifteen cents for it. And I believe they will."

"But what big articles can you promise them during 1907?" asked the Business Manager.

"In a very real sense this is a news magazine," replied the H. I. E. "At a hundred outposts along the firing line of the endless struggle between man and the forces of nature, our correspondents and photographers are stationed. As well expect to give the program of a great war for a year in advance as to try to specify what we shall print during 1907. But if hard work and money and editorial judgment do not go astray, we shall publish every month in the year a vital, almost breathing, picture of life as it is lived by the red-blooded, stronghearted men who are doing the great work of the world."

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