Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 425
instances above men-tioned may be taken as merespecimens of the physicaldifficulties attending a workof this kind. There are oftenothers arising from the un-usual circumstances underwhich the workmen areplaced, and others again fromaccidental causes alone. M.Favre experienced some ofthese, as, for… … Fig. iZ^b.— The UppermostMaienreuss. he 376 ROCK BORING. end, a source of great trouble. The cause of the heat is no doubtthe same as that which is held to support the theory of the earthscentral heat. Numberless observations have established the fact that thetemperature of the earths crust…
Inventions
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