Indicator for Hot Journals
Indicator for Hot Joumals.--M. Coret has contrived a simple tpparatus for giving an alarm, when boxes are not sufficiently greased. 'It embraces a certain number of metallic tubes with elastic bottoms, -filled with an expansible liquid, the whole enclosed in a small metallic cylinder. The instrument can be attached to a turning arbor, and if the arbor heats, the liquid dilates, forming an electric contact, which sounds an alarm.--Soe, d'P, ncour, pour l'Ind. Nat. C. A b r i d g e d L a b o r . - - I n a paper on the division of the circumference into equal parts, Ed. Lucas introduces a process for accomplishing a calculation in thirty hours, which would have required three thousand years of constant labor under the old methods. It would take more than two hundred million centuries, at the rate of :ten figures per second, to simply write out the numerical value of a quantity for which the expression can be written, in his formula, in less than half a second.--Comptes Rendus. C. W a g c s - I n s u r a n c e . - - T h e Industrial Society of Reims recommends an addition to policies of insurance against fire, of a clause, providing for the payment of wages to the workmen, during the time that they are thrown out of employment by the necessary repairs. The proposal receives a qualified approval from a committee of the Industrial Society of Mulhouse, with a recommendation that the Alsatian custom, of reserving a fund in each establishment for such contingencies, should be more generally adopted.--Bull, de la See. lnd. de M. C.
U s e s o f I n j e e t o r s . - - T h e Journal des Eabrieants de Sucre describes various economical applications of the K~irting injector, in the removal of gases, liquids and solids. In chimneys that are sufficient for a given number of boilers, the addition of another boiler often weakens the draft, which may be restored by an injector. In one instance, two boilers were required, using in 230 hours, 78,120 kilogrammes of coal; after adding a KJrting injector, only 36,375 kilogrammes were consumed in the same time for the same work, and only one boiler was required. The same injector has also been used as a smoke consumer; as a blower for stoves; as an extractor of carbonic acid gas; as a pump for well water, for thick and muddy liquids, for beet-juice, for milk of lime, for acids, for lyes and for locomotives at watering stations ; as an elevator for animal-black, for grain and for granular solids ; and as a sugar clarifier. C.