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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...after the preceding adjustments have been made, level the instrument and revolve it 180 degrees on the vertical axis. If the bubble runs toward one end, the Y on that end is too high, and the screws at the end of the horizontal bar are moved so as to correct one half of the apparent error. Then repeat the operation ...

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