โ Scribed by C.
No coin nor oath required. For personal study only.
Condensers of Tempered Glass.
,lass of engines no one will deny; and that the public now timl that they can place confidence in the engines is evinced by the number of new firms which of late have taken up their manuf'teture. In many eases, where hitherto small steam engines have been exclusively used, gas engines are rapidly taking their places. One very great point in their favor is that no extra insurance premium is generally required. Another great advantage held by gas engines over steam engines is the fact of being able to get full power whenever required at a moment's notice, without the time usually wasted in getting up steam. Moreover, as soon as the gas engine is stopped consumption of filel ceases, and no steam has to be kept up in case the engine is wanted only at intervals. The electric light scare undoubtedl~ acted most beneficially tbr gas engine nmkers. Apart from the fact that gas engines were in many eases put down to drive the electric light machines, it brought gas companies to their senses, and caused them to supply, in some cases, better and cheaper gas. This was an exmt in(lueement to people to, lay down gas engines which had not previously existed. Undoubtedly the fact that gas engines have now proved themselves really reliable motors has induced various trades, where hitherto hand-power has been ahnost entirely used, to put down a safe and economical motive power, as a means of developing and extending their trade. In many cases power is required where the high insuran<,es on steam boilers have hitherto precluded their use. Gas engines, then, at once step in to overcome the difficulty. With them their is no smoke, n(,. water, no coal to get in, nor ashes and cinders to remove, no boiler to blow up, or at least to insure; no waiting to raise steam or waste in keeping it ready, no stoker, and no cumbrous boiler setting. That some difficulties yet remain to be overcome may be admitted, but tlmt these do not hinder their practical utility is now well proved by the many thousands of them already tbund in use scattered over all parts of the world. --Engineer.
Glass.--(~. Ducretet says_, that rc(d~ pients of tempered glass, when employed like Leyden jars, are eapable-0f receiving, without being fractured, a strong charge of electricity,. and, consequently, of giving condensed sparks of a power tgr superior to those which are ordinarily obtained. Plates of tempered glass van be employed in the same manner. Leyden .jars of very minute dimensions give remarkable results.--Comples Reneh~.~.
C.
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