assistant draws it steadily through the helix note the changes of metal, heavy ordnance, pieces of ma- the needle i in the several magneto- chinery, and small articles, such as pieces of fire-arms, sabers, bayonets, &c, the meters. Having previously ascertained the apparatus will of course be… … pany's engineer, the result of observa- tions taken since 1871 at Port Said, Suez Fig. 4 represents the helix as con- and other stations. Notwithstanding structed and arranged for testing plates Lake Timsah and the Bitter Lakes, of iron and steel. By this construction which form two great…
Engineering
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