Show toughened and hardened glass and other materials J ju 11 l yot Vot notwithstanding withstanding th the e waily warly wally cop cog 1 I mules luries during which the 0 O titre tiare or glass has been application atlon has hm been bean restricted to a limited niEr number of uses owing to its great fragility fra fro clity clean trans transi i f parent and elegant no substance would be so admirably adapted to a tast vast va st variety bf household uses as glass glasa ware were it liot ilot not for its extreme liability to fracture this difficulty hattit has hag at length been over overcome corwe corbe by a french philosopher mons F francois ran de dela ja bastle bastie the process m con sits broadly stated in brin bringing L ing tho glass up to ithe the melting pont point poat and then immersing ib ili in a bath of a heated oleaginous compound from which it is instantly withdrawn there are however many delicate considerations con connected lid iid acted with the te details odthe of the ope ode operation ri which v the success of the ture entirely depends should the ilie glassnor glas snot be sufficiently heated it lt will vill not be susceptible to the influences fluen ces of the bath baab whilst if it it ift be overheated it wili will I 1 loso joso ose its ta shape the I 1 constituents of or the bath and its IL temperature mattiro besides materially af afi neel feet the tile result the costs of tempering are very small and tho the ne necessary machinery expensive inexpensive la that he be has entirely succeeded la in lis ils his ende endeavors avora we can testify from 4 a personal inspection ofa of a variety of samples at the offices of 96 abel rey bey broi bros of 29 mincing T lunnie nil nii all IV who 0 ars arg are the representatives enta tives fives or mons mol de li ha bastie bastle and the agents e ats for the ale of the patent t the e principle of hardening either r glass iron or other substances which has been invented and patented teu ten tou t ed by mr ir jolin john macintosh C E I 1 is perhaps Ds along with that for toughen toughening ing log glass imo ngat the mast extraordinary and at tha the ame same time simple discoveries of tile the present dra era in the case ease of stone breakers the chilled jaws jews used for crushing the stone haire have loa ida long iong been known to be sile slie ole aile to td resist a tear and wear under which common iron at once mr mac tad intosh has pushed ushe d his expert ments further and hns has succeeded by ay common glass ta 0 o the tho same game same treat ment in rendering was ibb as hard bard and as brilliant as the he diamond ail all that is required is to have tho the glass polished by a apt lapi dary when it has a brilliancy which must be been seen tobe tobo comprehended brilliancy is merely a result of ex hardness and glass or 01 any metal which has lias been prepared according to mr daar macs into inlo antons in tons lons wa patent pos possesses esses this quality in the highest degree com mon sand when heated in the same edme manner and suddenly chil ehll chilled ledi he quires acquires a hardness which makes it most suitable whether made up into wheels with lann iann lannote tle tte or simply used as dust for nor cutting the hani the invention indeed beedis is capable of so sy wide an application that it is impossible to fix nix thi the limits 0 of its wf use A fur further thee and yand moat valuable adaptation of ot the system 1 is 16 to the iron plates of ships and to the shoes or honses horses in rh these instance instances 1 I 1 iti is ony the outer surface which is harde barde hardened tied it is well known that ili in the case of bf projectiles jec tiles intended ed to N mused bemused used against armor plated vessels ib it has been geen been seen found ils jis as in the tho case of the ser shot unless the extremity ba either elther chilled or pointed with hardened steel stee lithey they cannot penetrate thi outer casing at h would seem indeed that all our ideas of the natural qualities of various substances are to be overturned of metals that to which we have been wont to look As ba possessing the tho greatest degree of hardness steel swei has been held forward as affording the tile most remarkable example 16 bufithis has been beeb proved to be bbb afalla ey dy by the jaws of or the slone stone sione breaker already mentioned menio menlo ned and still infinitely more merb so by the nibs niba which when properly made surpass corundum in that pr property the two inventions ought to go pati pari and in gims glass we may have a material suited salted for a variety of purposes ses seg to which we now only apply metals thus we ve may have our saucepans made of this evegan elegant and cleanly material whilst for fon all the many uses of ot tray trays spoons and band eve evenus even soup lad iad ladles leg les it would bo be equal ly fid apted tnt tuu of broken watch glasses need no longer be dreaded dreaded and the chim i 1 of our lamps which so s q often snap a at the e mos most moat un propitious ous gus moments e ts will be made as durable as the 40 poker 0 eror or tongs tones which we use in ou our fireplaces rep laces there kle ife are lie indeed so many cases where glass might be most profitably substituted for the metals now employed as well from its cleanliness as bis fromm its lightness that we may look forward to a complete revolution in ili our household and ftuer othel appointments 11 esh esa r went hint ardd 1 |