Plate 28.

K.0.&, M.R.&, B.OO:

Memphis Bridge

Diagram showing rate of progress in sinking caissons.

1888 .

1888 _

1890 _

Elevation

above meanjfcilf tid

Elevation Tabove meal .ItlMUl'il'V

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August

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October

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December

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ROBERT.A-Wtl.KE- PHOTO-LITH. 178 WILLIAM ST.H.y.