Spirit Level. Page: 2 of 3
[1], 2 p. : ill. ; 23 cm.View a full description of this patent.
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UNITED STATES PATENT OFFICE.
ALLEN T. GIBSON, OF HODGES, TEXAS.
SPIRIT-LEVEL.
No. 824,109. Specification of Letters Patent. itentea June 26,1906.
Application filed August 12, 1905. Serial No, 273,958.
1'o all whom it may concern., needle-locking lever 9, which when the im-
Be it known that I, ALLEN T. GIBSON, a plement is not in use in running lines will
citizen of the United States, residing at hold the needle off the pivot, and thereby
Hodges, in the county of Jones and State of prevent damage thereto. 6o
5 Texas, have invented a new and useful Spirit- The spirit-tube 10 beneath the plate 3 is
Level, of which the following is a specifica- , used for ordinary leveling purposes, and the
tion. spirit-tube 6, as above pointed out, for
This invention relates to spirit-levels. . plumbing-work, and in order to provide
The object of the invention is to provide a means whereby different angles may accu- 65
1o spirit-level wherein by the novel arrange- rately be determined there is a third spirit-
ment of its parts the instrument may be used tube 11 provided, which, as shown in Fig. 1,
not only for obtaining level and perpendicu- is somewhat greater than a semicircle in or-
lar lines, but also for determining any desired der that angles up to one hundred and eighty
intermediate angle with accuracy and ease. degrees may be computed. This tube is held 70
15 With the above and other objects in view, in position within the stock 1 by means of
as will appear as the nature of the invention four plates 12, 13, 14, and 15, and in order to
is better understood, the same consists in the shield the tube 11 from injury it is disposed
novel construction and combination of parts intermediate of the width of the stock, as
of a spirit-level, as will be hereinafter fully clearly shown in Fig. 3. The plates 12 and 13 75
20 described and claimed. are disposed at inward-diverging angles rela-
In the accompanying drawings, forming a tively to the tube and bear thereon, the outer
part of this specification, and in which like faces of the plates being each divided into a
characters of reference indicate correspond- sector, as shown in Fig. 1, for the purpose of
ing parts, Figure 1 is a view in side elevation determining degrees of inclination. The 8o
25 of a spirit-level constructed in accordance plates 14 and 15 are similarly inclined and
with the present invention. -Fig. 2 is a top have their outer faces formed into sectors for
plan view of a portion of the level. Fig.3 is a the same purpose, the divisions of the four
view in transverse section, taken on the line plates coinciding, thereby to secure absolute
3 3, Fig:.1. accuracy in determining the angle at which 85
30 The stock 1 of the level may be made of the stock may be held by bringing the center
any suitable material, preferably of hard of the bubble opposite the angle desired, as
wood, as usual, and is faced on one edge with a shown. The plates 14 and 15 extend to and
metal strip 2 and on its other edge interme- bear against the facing-strip 2 and will
diate of its ends is provided with an inset thereby be protected from injury and are 90
35 plate 3, having a sight-opening 4, through held combined with the stock by screws 16.
which the bubble in the tube may be inspect- By having the plates 12 15 inclined, as de-
ed, as usual. The edge of the stock just de- scribed, the scales thereon will be protected
scribed is graduated into inches and parts of from liability to damage, will be brought
inches, which, as shown in Fig. 1, extend closer to the spirit-tube 11, and thus insure 95
4o down on the side, thereby to facilitate meas- more accurate measurement of angles, and,
uring .by holding the implement in different further, will afford a positive means of holding
positions. the tube combined with the stock. As will
Near one end of the stock is an orifice 5, be observed by reference to Fig. 3, the op-
which. extends entirely through the same and posed faces of the seats 17, in which the tube 100
45 within which is arranged a spirit-tube 6, that is disposed, are concaved to conform to the
constitutes a plumb, the same being disposed shape of the tube, and thus operates jointly
exactly at right angles to the length of the with the plates to hold the latter against
stock and held in place by plates 7, which lie shifting.
flush with the sides of the stock,.this arrange- By disposing the tube 11 in the manner 1 o
50 ment being adopted in order to permit the shown and described it can be freely ob-
tube 7 to be inspected from both sides of the served from both sides of the implement, so
level. Near the other end of the stock is ar- that the graduation-marks. of the different
. ranged a compass 8 of the usual or any pre- sectors or plates 11 15 can always be brought.
ferred construction and which is employed accurately to the center of the bubble. As 1is55 for running lines for the foundations of build- . stated, the spirit-tube 11 is somewhat
ings. The compass has combined with it a greater than a semicircle, and in order to per-
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GIbson, Allen T. Spirit Level., patent, June 26, 1906; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth511606/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.