How a new stump-puller can haul the tank Britannia
Item
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Title (Dublin Core)
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How a new stump-puller can haul the tank Britannia
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Article Title and/or Image Caption (Dublin Core)
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Multiplying the Power of Your Arm
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extracted text (Extract Text)
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IF you were asked to pull the tank Britannia over the bar-
rier of logs shown in the illustration, you would say that
one man couldn't possibly do it. Yet a machine designed
for stump-pulling did this unusual feat, and could do it all
day without breaking or straining its mechanism.
This machine pulls down from eight to ten trees a day,
and requires only two men—one to set the line, the other to
work a lever. Its weight is a little more than two hundred
pounds. All the working parts of the machine are of case-
hardened steel.
‘The machine actuates two pawls, a long and a short one.
A twelve-ton lifting jack, operated on the pawl-and-ratchet
principle, is the mechanical first cousin of this invention,
the only difference being the arrangement of the parts.
The machine rotates a drum
and hauls in the cable one inch
at each stroke of the handle.
The sweep of the handle is
about three feet, the necessary,
pull being given by the operator’
in a standing position.
No trouble was experienced
in pulling the tank over the ob-
struction, except that of the
snapping of a one-inch steel
cable, incidentally nearly cut-
ting a man’s head off. You can
imagine the tension of this
cable when the leverage was
applied.
This unusual feat suggests
others that may be performed
with the contrivance. For in-
stance, old buildings may be
razed, stone and brick walls
pulled down, as well as trees,
chimneys, and so forth. For
this machine is capable and,
moreover, willing to cooperate
with you in speedily effecting
the downfall of the thing you
have in mind.
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Language (Dublin Core)
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eng
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Date Issued (Dublin Core)
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1919-12
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pages (Bibliographic Ontology)
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22
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Rights (Dublin Core)
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Public domain (Google digitized)
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Archived by (Dublin Core)
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Davide Donà
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Alberto Bordignon (Supervisor)
Popular Science Monthly, v. 95, n. 5, 1919
