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In the accompanying drawings forming a part of this specification,
Figure 1 is a top plan view of a combined level and grade
finder constructed in accordance with my invention.
Fig. 2 is a longitudinal sectional view of the same.
Fig. 3 is a transverse sectional view taken on the
line 3—3 of Fig. 2. Fig. 4 is a side
elevation of a portion of the instrument showing the graduated
dial. Fig. 5 is an enlarged front elevation of
the dial.
Similar numerals of reference indicate corresponding parts
in all the figures of the drawing.
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The improved tool or instrument comprises a stock or body
portion 5 having a spirit tube 6 seated
in the upper edge thereof and a similar tube 7
extending transversely of the stock near one end of the
latter, as shown. A longitudinal recess 8
is formed in the lower edge of the stock, said recess
being covered by a metal plate 9 which also serves
as a binder to the lower or wearing surface of the stock.
One end of the longitudinal recess is closed by a plate
of glass or other transparent material 10 while
the opposite end thereof communicates with an inclined
recess 11 which extends to the upper edge of the
stock and is covered by a transparent plate 12,
there being an inclined mirror 13 disposed at the
juncture of said recesses for reflecting the rays of light
passing through the longitudinal recess upwardly through
the inclined recess 11. The above mentioned
elements are shown and described in my former patent No.
764,809, dated July 12, 1904 and form no part
of the present invention, being merely illustrated
in order to enable the improvements hereinafter described
to be more readily understood.
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