Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 184
imes hibit their use in this form ; they will ap^ pear in my geological report. these distances horizontally, the needle is often deflected in the Marquette Region. Under this head we will consider: 1st. Variations or deflections of the hori- Having now described the instruments employed and mode… … See Map This is well illustrated by Fig. 1, which due to greater depth of earth in that direc- tion, which removes the needle further is a magnetic plan of the west end of the from the ore, thereby giving the ore less new Washington mine, embracing Pit No. 10. The dotted line represents an outline…
Engineering
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