Engineer soldier's handbook. Page: 23
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ENGINEER SOLDIER'S HANDBOOK
FIGURE 35.--Gasoline-driven chain saw.
to guide a tree in falling and sometimes to use hand or
motor power to pull a tree in a desired direction.
N 13. MAKING TIMBER JOINTS.-In rough carpentry work,
the butt joint and the lap joint are used to join or splice
two pieces of wood so that they form one continuous piece.
(See fig. 37.) The butt joint requires the use of fishplates
to hold the ends together. The lap joint is made by over-
lapping the ends of two timbers and nailing them together.
This is the simplest and quickest splice for bracing and like
* 14. DRIVING DRIFTPINS.-Driftpins (heavy iron spikes) are
used to fasten large timbers together. Since driftpins are
made of relatively soft iron, holes must first be bored in the
wood before the pins are driven. These holes should be
slightly smaller in diameter than the pin itself; for example,
the hole for a 1/2-inch driftpin should be made with a 7/6-
W 15. HANDLING LOADS.-a. Heavy lifts.-The proper method
of lifting heavy loads is to make the legs do the work. (See
fig. 38.) Do not bend over from the waist and throw all the
strain on the groin and back muscles. Improper methods of
lifting often cause a hernia (rupture).
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United States. War Department. Engineer soldier's handbook., book, June 2, 1943; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc28313/m1/29/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.