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UNITED STATESPATENT OFFICE.
JAMES F. STALCUP, OF HOUSTON\, TEXAS.
LUMBER-CALCULATOR.
990,603. Specification of Letters Patent. Patented Apr. 25, 1911.
Application filed J'anuary 17, 1910. Serial No. 538,479.To all whom it may concern:
Be it known that I, JAMEs F. STALtUP, a
citizen of the United States, residing at
Houston, in the county of Harris and State
5 of Texas, have invented certain new and use-
ful Improvements in Lumber-Calculators. of*
which the following is a specification.
This invention relates to a method or
means for indicating or calculating the
10 amount of lumber in any given number of
pieces of manufactured lumber, said pieces
being of definite dimenilions and lengths.
For a full understanding of the invention
reference is to be had to the following detail
15 description and the accompanying drawing.
which represents a fragment of a device
made in accordance with this invention.
In carrying out this invention it is con-
templated that there will be provided as
20 niany charts as may be required to represent
measurements for all the ordinary forms of
lumber, such for instance as 1x4's, 2x4's,
2x6's, 1x6's, 1x8's, 2x8's, and so on. The
. part indicated at A is one designed to be
25 used with reference to lumber of the dimen-
sion 2x6's, and the same is divided into main
blocks indicated at a, each of said blocks be-
ing designated by a numeral to indicate the
.length of the lumber appertaining theeto.
30 said indicating numerals being referred to
by the letter b.
The primary object of this invention is to
provide a means whereby at a glance the
number of board feet in any given number
35 of pieces of manufactured lumber or timber
of known dimensions or length may be indi-
cated withot resorting to inathematical
computation.
Each of the main blocks a includes a main
40 group of numerals or columns of numerals
indicated at a', a plurality of vertical single
columns at one side of the main group, and
a horizontal series of numerals. The main
group a' of numerals is preferably separated
45 from the vertical columns and the horizontal
series of numbers by distinguishing e Taie-
ter of line c and c', the same Lzing of sOe
suitable color or in some other way made to
guide the eye readily of the observer. At
50 the lower left hand corner of the main grop
a' and preferably below the horizontal in-
dicator line is a base numeral d. The base
numeral represents the number of boardl feet
in a piece of lumber of trie length indicated
55 by the indicating numeral b and of the di-
mension indicated at e at the top of thechart. One of the vertical columns f is made
up of key numbers to be used in guiding the
eye of the observer to the result desired.
Another of said vertical columns, indicated 60
at g, represents multiples of tens'of the base
numeral, and at h is indicated the third ver-
tical, column of numbers representing mul-
tiples of hundreds of the base numeral.
Each main group a' is made up of nine ver- 65
tical columns, each of, which is headed at the
top by a unit digit a", and below the hori-
zontal leader line c' at the right of the base
numeral d the numerals represent the num-
ber of board feet of the character of lumber 70
indicated in as many pieces as are indicated
by the unit digits a'. Starting from the
base number d the number of board feet in a
single piece may be considered as being di-
rectly beneath the unit digit 1'in set a", or 75
upon the opposite side of the leader line c
opposite the numeral 1 in the column of key
numbers f. The number of board feet in
any number of tens indicated by the other
numbers of the key number column f will 80
be represented by the corresponding num-
bers in column g. The combination of any
number of tens with any number of units
will be represented by the number found in
the main group a' opposite the proper num- 85
ber of tens in column f and directly beneath
the proper unit digit in the main group a'.
For instance, if it be desired to determine the
number of board. feet in sixty-seven pieces
of 2x6's, 12 feet in length the observer would 90
run his eye down the chart to the main block
a indicated by the indicating number 12 and
beginning at GO in column f would glance
thence to the right as far as the column in
the main group a' headed by the unit digit 95
7 where he would locate the number 804.
The sanie process would be followed in de-
termining the number of board feet in any
other number of pieces of lumber of a cer-
tain size less than one hundred. For a num- 100
her of pieces greater than one hundred col-
umn A will be observed and to the number
of board feet found by the above method for.
tens and units will be added the number in
the column h opposite the required number 105
of hundreds. For instance, should it be de-
sired to determine the munber of board feet
in seven hundred and sixty-thrde pieces of
lumber 2x6's and 14 feet long the observer's
eye would pass to the left of 70 in the key 1i
number column f to the number 9800 thence
to the right of the key number 60 as far as
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Stalcup, James F. Lumber-Calculator, patent, April 25, 1911; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth513471/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.