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Show 1 Vl Xinci 'Queries. I linvc often heard the i'xprcimi "from a to izzard." Was i. ever culled "iznrdJ" OLD SUllSCItllllMt. Yex, n ml Webster su.vs that It was Iirolinlily called so from "s luirtl. Will you tell mo what i "Virisll," who tvat lhnle. what i incnnl by "Dante's Inferno," In-ferno," and what are the nevcn wonilern of tho world. INQUtSmVi: UKAUElt. Virgil wns tin Italian poet born In 70 It. O. Tim term "Vlrsll" is sometimes used wiien roferrlns to his Riont work, "Tho AeiteUl." finite wns also mi Itnllitn poet, born In 111.". Ills description descrip-tion of hell and purKntory Is known ns the "lnfeiii'o." Wlmt nre known an tho seven ancient wonders of the world nr: I'yrninlils of Ks.vpt. hniiRlng gardens gar-dens or liab.vloli. iiiaiiM)leuin of Hall-carniiHsus, Hall-carniiHsus, Teniple of Dlniin la Uph-osiih. Uph-osiih. Colossus of Ithodes, l'hnros In Alexniidrhi nnd the statue of Olympian Jove lu Klls. Will you kindly explain throujh your inquiry in-quiry department the chemical action which takes place in the manufacture of Portland cement from lime rock and shale, nnd why the two. when combined in a wet uLate and lim-ne.i, will produce a cement ce-ment which hardens ai hard ns a rock, whilej cither clement when bunted and combined dry will only make a lime plai-Wr plai-Wr or a substance which H not linn! at all? YACOH. A great deal of Investigation has been done to determine the reiison mid reactions re-actions in the- setting nnd liaitleiilns of cement, l'.rli'ily summed, the conclusion conclu-sion reached und apparently now fully estublished. Is that, In the proces3 of buriiliiK, the clay nnd lime combine. foriiiiiiK liintle silicates and alumliiales of limp, which then with water form crystallized hydrnted silicate nud altimlnates respectively, thtfs causing liardciilng. If It be borne lu mind that the crystalline hydrnted silicates closely correspond to tho zeolites of nature, and the crystalline nluinluates to the spinels, the hardening Is readily understood. This explains also why a mixture of burnt clay with burnt lime, does not yield a cement; In this case there Is no combination between the clay nnd the lime, and consequently the lime simply slakes with water in the usual manner. J, G. If. nslcs whether surveyors make any allowance for the curvature of the earth in surveying large tracts of land or bodies of water. The curvature of the earth Is always a factor in accurate surveying. The United States Geodetic Survey makes a lino point of this clement. The curvature curv-ature for one mile is O.C.liT of a foot and for three miles It Is six feet. An appropriate ap-propriate rule is, two-thlrds the square of the distance lu tulles equals the curvature curv-ature lu feet. The South Atlantic Ocean has not yet been fr'.;.- surveyed. 0. II. nl; where the earth's centre of gravity i. SuppoMn:; that a fhaft goes tlirotifli the earth's centre, and a ball drops into it, wlieie wiil the ball slop? The earth acts as If tho centre of gravity was at the centre of the form of It. If ii hole were mndo through the earth to the opiio-dte side, nnd a ball were dropped In.o It, the ball would ultimately ul-timately come to rest at Hie centre of the earth. |