274 SJÖTTA ATRIÖI. sem bullurnar og bullusköptin í liggja öll eins lárétt (myndin sýnir fremra sívalnínginn og safnker þab, sem vit hana á). — 6. Varúöarhanarnir H og L, reykháfurinn upp af rúminu D (sem leiöir burtu revkinn og heita loptiö) og stór vogarstaung, sem liggur á undirstöÖudeplinum P, og armurinn á er N. þetta eru aöalatriöi braulfarandans, og látum vér oss nægja aö hafa drepiö svo mikiö á þau, sem vér ætlum aö nóg sé til þess, aö lesendum vorum takist aÖ gjöra sér nokkra hugmynd um þetta snildarverk íþróttarinnar. Fyrirkomulagiö á gufuskipunum er mjög Iíkt því, sem þaö er á gufuvögnunum. Vélin er optast nær í miöju skipi, og hreifir hún sitt trogspaöahjóliö hvorumegin viÖ skipiö. Hjól þessi eru mjög lík trogspaöahjólum þeim, sem á eru sumum vatnskvörnum. Ariö 1807 smíöaöi Robert Fulton þegar gufuknör mikinn, sem fór 120 vikur sjáfar á 32 stundum, þegar hann var hlaöinn meö 160 tunnum. Gufuknör þessi hét Klermont. Næst eptir gufuvagna og gufuskip eru gufu-fallbyssurnar teljandi. þær eru aö nokkru leyti svipaöa'r vindbyssunum, nema aí> hér er gufu-umbúníngur í staöinn fyrir vindsumbúnínginn, sem á þeim var. Maöur nokkur aö nafni Perkins var sá fyrsti, sem notaöi gufu í staöinn fyrir púöur. Meö því aö lýsíngar og myndir af gufutólunum veröa jafnan mjög ófullkomnar, og fullnægja fáum eöa engum, sem aldrei hafa kost á aö skoöa tólin sjálf, þá hvetjum vér alla þá af lesendum vorum, sem geta, til aö skoöa þau og athuga vandlega allt þaö, sem þar aö lýtur. 10. SPURNÍNGAR TIL AD RIFJA UPP EPTIR, Hvaö töluöum vér um áhrif hitans á náttúruna, og einkum á manninn? Hverjar eru aöaluppsprettur hitans? Getum vér nefnt nokkra viöburöi, sem auösjáanlega eiga rót sína í snögguin samdrætti líkamanna? Hvernig veröur ymsum slíkum viöburöum afstýrt? Hvernig eru lögmálsatriöin fyrir afli því, sem sólar- geislarnir hafa til aö vekja meö hita? MeÖ hvaöa tilraunum greiddum vér oss veg til aö sjá þaö ? Hverra náttúruviöburöa gátum vér, svo sem hinna helztu afþeim, sem koma frásólinni? Hvaöa áríöandi atriöi uin sólina minntumst vér á ? Hvernig fórum vér aí> því, aö finna hina þriöju hitauppsprettu ? — A hverjar

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