• AVITOR AIR SHIP. flat surface, and spread out into a large square of thick opti-cal glass. It is again annealed, and polished to the requiredmagnifying power. It will be easily seen from all these pro-cesses that fine optical glass must necessarily be very expen-sive.—English Mechanic. a a» m… … duced more important results than these, and their adoptionhas become so universal, that it is almost as difficult to find alarge farm unsupplied with one of them, as it would ,be tofind one without a plow or a harrow. Much attention has therefore been latterly turned to theperfecting of details,…
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