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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 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

signals are flashed. 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

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 1/2 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 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.


Upstairs With the Editors



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

wait for it to come month by month. EnOne of the very best publications produced in this 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

"Ile-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. THE TECHNICAL WORLD MAGAZINE. And

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

pose, we've reached the limit. 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 "I low's that for a bunch of language?" remember the sensation caused a few whispered the Office Boy. years ago by his novel, “The Story of a "We'll do that." said the II. 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

supWe are


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UPSTAIRS WITH THE EDITORS(Concluded) to take pictures, for one thing. And you tisers to pay for the whole thing," said are paying higher prices to writers al- the Business Manager. most every month.”

“Then raise the price to subscribers,” "Next month it will be larger still," declared the H. I. E. "If we give our answered the H. I. E. "We've got to readers twenty cents' worth, they should keep this magazine ahead of the field. be glad to pay fifteen cents for it. And I And we're going to print in two colors, believe they will." too. That will add more to the bill. The "But what big articles can you promise best, most entertaining, and most valuable them during 1907 ?" asked the Business material, the most striking and remark- Manager. able photographs, all printed in the most “In a very real sense this is a news beautiful way possible, are what we owe magazine,” replied the H. I. E. “At a to our 135,000 enthusiastic subscribers. I hundred outposts along the firing line of don't believe any other publication ever the endless struggle between man and the acquired well on to 150,000 warm friends forces of nature, our correspondents and in the short space of two years. We've photographers are stationed. As well got a wonderful ideal before us, too—a expect to give the program of a great vision of the time when every article war for a year in advance as to try to shall be as interesting as a novel by Du- specify what we shall print during 1907. mas, as inspiring as a trumpet-call, and But if hard work and money and edias valuable as the bank book of the torial judgment do not go astray, we Standard Oil Company. We've got to shall publish every month in the year a have big men to write that kind of ar- vital, almost breathing, picture of life as ticles.”

it is lived by the red-blooded, strong"But where is all the money to come hearted men who are doing the great from? It isn't fair to ask our adver- work of the world.”

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