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INDUCTION COIL FOR IGNITION PURPOSES.

nating-current magneto. The alternat all subsequent ones; and the time of its ing-current magneto is also used with ultimate complete destruction is hastened the jump spark on a number of foreign by the excessive discharge rate. If the cars.

battery has been allowed to discharge Batteries possess the advantage over after the voltage has reached a certain other forms of current generators, that

minimum indicated by the makers of the their maximum strength can be used for battery, generally about one and eightstarting the engine, but the disadvantage, tenths volts per cell, sulphating and its that, after the engine is running, they consequent troubles result. Owing to the

nature of automobile work, this last abuse is probably responsible for the bad reputation that storage batteries have acquired with those experienced with them. The storage battery should be both charged and discharged through ammeters; and the discharge should be watched with a voltmeter, not to mention tests with hydrometer for specific gravity, etc. It is not practicable to observe

these precautions for ignition purposes. grow weaker rapidly, until they are ex

The dynamo system for ignition, with hausted. Some kinds can be recharged

the speed-governing pulley, is theoretito advantage; others must be replaced cally a very fine ignition system ; and, if with a new battery when exhausted. The operated by one familiar with caring for

electrical apparatus, it is really a very first cost of batteries is low, and their

satisfactory method. This system, howcare is fairly well understood by the average operator. The fact that it is im ever, possesses two very great disadvan

tages: first, the dynamo generates a dipossible to determine in any practicable

rect current of low voltage, necessitating way just when a battery will become exhausted, and the cost of maintenance, are

close care and attention to be given the

dynamo; second, the dynamo must run probably its most objectionable features. The dry battery, which is used most

ata constant speed, necessitating the use extensively, is reliable and cleanly, but of

of a speed-governing device, which, for short life, making it expensive to maintain. It will regain part of its original strength, if allowed to rest after being exhausted; but, when once exhausted, a new battery should be considered a necessity of the near future.

The storage battery, in connection with the dynamo or direct-current magneto, forms an ignition system which is almost ideal theoretically, but ofttimes impracticable. The storage battery is of great strength and is reliable until exhausted, providing proper care is taken of it; but unless it is given more attention than is the service required, has not proven algenerally given such a small part of an together reliable. The dynamo system automobile, it will prove a failure. For will sometimes work perfectly for a very instance, if it be charged above a certain long time, and then fail at a time most maximum rate, it will not receive a nor disastrous to its operator, without any mal charge, and will therefore become apparent reason for its stubbornness. exhausted earlier than it would naturally The combination of a comparatively do. If it be discharged above a certain high-voltage direct-current magneto with maximum rate, the battery will not only a reliable battery for starting purposes, fall short on its present charge, but on forms a very satisfactory ignition system,

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JUMP SPARK COIL.

even in unskilled hands; but it possesses

for every revolution of the armature. the disadvantage that it is sometimes im The above, it is obvious, would be the possible to find room for such a system. proper speed for four-cylinder engines. Then, too, the batteries must be attended If eight cylinders are to be fired from one to occasionally, and the apparatus should magneto, the magnetos are run twice as be overhauled each season.

fast as the engine shaft. The writer is decidedly prejudiced in The magneto alternator, when used favor of ignition by means of the alter with either make and break or jump nating-current magneto. The alternat spark, permits of the ordinary spark ing-current magneto, from an electrical timing, except that the timing mechanism standpoint, is the simplest electrical gen for the jump spark is very greatly simerator made. For ignition purposes, it al- plified. Since the spark is generated at

certain points in the revolution of the armature of the magneto, it is necessary, in order to change the time, only to change the relation of the armature to the engine crank; and this is accomplished by a simple construction made a part of the magneto. Probably the

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JUMP SPARK COIL, WITH VIBRATOR. lows of the most simple, positive installation in use. When used with the jump spark, a coil without vibrator is used with it, and but one coil for single or multicylinder engines. When used with the make and break spark, no coil is used. Owing to the very efficient designs of these magnetos, they will furnish a satisfactory spark at any speed between 30 and 3,000 revolutions per minute. An alternating-current magneto, not like the direct-current machine, generates its current only at certain points in the revolution of the armature. It is evident, then, that a magneto of this type must be driven by the engine through some posi

VERTICAL MAGNETO. tive mechanism, such as gears, chain, or pitman rod, and that the magneto and greatest advantage in the magneto alengine must be so connected mechanically ternator system of ignition, lies in its that the spark will be generated at the simple and positive construction. The required point of the engine’s revolution. magneto, not having either commutator Owing to the ability of this magneto to or collector rings and brushes, conducts generate a large spark at so low a speed its current through the simple bronze as 30 r. p. m., engines can be readily bearings of the machine, which are oiled started from it with the magneto driven in the usual manner. There are no adat the same speed as that of the engine, justments, and oil and dirt cannot damat which speed it is usually driven. The age the apparatus.-FRANK REMY in magnetos now in use generate two sparks Automobile Review.

The Forgery of Antiques

How European Dealers Take Advantage of the Collector

By GUSTAVUS MURRAY

HE CRAZE for collecting any in Florence and in Carrara, and seen thing old has swept Europe clean ‘age' given to marble by a newly discovof antiques. The moment the ered process which in twelve hours will

American tourist makes an in- give to a statue 500 times its true value. quiry for antiques, the modern Italian One sculptor, in whose studio fifty men looks upon him as a bird to be picked. were hard at work making antiques, inHe knows there are no antiques left. He remembers his father selling at a good price their carved chest, brassware, a madonna, and even the household pot

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BOWL WITH COVER.

Imitation of Imari Porcelain.

formed me that the greater part of his output was shipped to an agent in New York, who judiciously distributed it to dealers all over America.” So clever is this mode of giving age, that the combination of acids applied is absorbed by the marble and turns it yellow right through, so that even experts can be deceived by those ingenious imitations of

Michael Angelo, Donatello, and other FORGED RIBBON-BACKED CHIPPENDALE CHAIR.

celebrated sculptors. tery. At first the Italians told the tour At Athens there is a factory busy all ists there were no antiques left; but, the year round turning out by the score finding the truth of no avail, and being an "ancient" Tanagra terra-cottas. One of obliging people, they invented a new in these imitations will be sold for fifteen dustry-the counterfeiting of antiques— hundred dollars when fifteen dollars is which has to-day become almost a fine every penny it is worth. art.

When old silver became the fashionAn English gentleman of many years' able craze, the little stores on the Ponte residence in Italy, says: “I have stood Veccheio contained many genuine chalin more than one sculptor's studio, both ices, goblets, sugar basins, and the like

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such an extent is this counterfeiting carried on that after a Russian nobleman had spent twenty-five thousand dollars in

a genuine piece—say a fine old gobletand produce exact copies. By a chemical process they give them an appearance of age that would deceive the eyes of an expert. For years there has been an increasing demand by collectors for mediæval armor and arms. In a back street of a prosperous Italian city is the workshop of a man who is a genius at manufacturing every conceivable kind of armor, from breastplates to gauntlets, from halberds to swords and daggers, all stamped with the monograms of some famous Spanish or Italian armorer.

The steel is treated with acids; the bronze hilts of swords are dipped in some kind of solution to give the appearance of age and use ; then the pieces are placed in boxes of damp earth to induce rust; and in a week or two they are ready to be sold to the dealers at so much a dozen.

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the false from the true, he sold the entire collection for what it would bring.

In Manchester, England, a large number of men are employed in making old furniture. The large majority of the supposedly genuine Sheraton, Chippendale, and Happlewhite sold in London, each with a certified pedigree that runs back to the middle of the eighteenth century, are probably not more than three months from the factory. A dealer described the making of a sixteenth century chair in these words: “You make the chair to pattern, soak it in a certain fluid, then shoot a few rounds of small shot into it, to give it a worm-eaten appearance, and there you are!"

Grecian terra-cottas, Louis Seize, Queen Anne furniture, Tanagra statuettes, Egyptian pottery, ancient brasses, pictures, armor, arms—in fact, you have

only to say what particular antique you want, and the London, Paris, or Italian dealer will in a week's time secure it and supply gratis an unimpeachable history, sworn to by the descendant of six generations.

Sacred scarabs, little Egyptian charms, are manufactured by a Connecticut firm. They are carved and chipped by machinery, colored in bulk, made to simulate age, and shipped in casks to the Moslem dealers in Cairo. The Arabian guides are the chief buyers, many of them being adepts at "salting" the sands at the base of the pyramids or about the sacred temples, where they artfully discover these scarabs before the very eyes of the Yankee tourist, and sell him, for an American dollar, an article manufactured at a cost of less than a cent, perhaps within a stone's throw of his own home.

The Worth of a Patent

A

S SOON AS the average man ob Inventors, however, are often without extains a patent upon any device, he perience or knowledge in regard to the considers that his fortune is business side of the question and the dif

made, and that he has only to ficulties which attend the introduction let people know what he has done and and marketing of even a meritorious where he lives to be overwhelmed with article. Before a patent can make reoffers for it at his own price. The facts turns to any one, much time and money are that a patent is no more and no less must be put into it, and all this is to be than documentary evidence that the recovered before the investor can recoup holder of it is entitled to its exclusive use. himself for his outlay, to say nothing of If he does not wish to use it, and will not making money on the venture. The sell it at a reasonable price, the inventor large sums said to be paid for patents holds a piece of paper only, wliich de that are not remarkable for novelty, teriorates rapidly from the competition being mere improvements upon existing of other inventors in the same field. machines or relating to some unimportant What is a reasonable price for an inven article, are mostly fiction. Inventors are tion, depends wholly upon circumstances apt to have an exaggerated idea of the and conditions. If it relates to an article value of their patents, and to think that that will have only a moderate sale, a they should receive for their patent what very moderate sum is all that can be it may be worth after all the work reexpected, if, indeed, a manufacturer be quired has been done and the demand has found who desires to take the matter up. been created.

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