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Abstract

When a solid body suffers a blow, it is obvious that
that portion of the energy of the blow that is not converted
into heat, must give rise to vibrations radiating from the
point of impact in all directions. It is further apparent
that these vibrations may not only result in detaching a
flake, but if the energy was large enough, there may be
a surplus, resulting in vibrations which must give rise to
accessory marks, not only on the parent block, but also on
the detached flake. On the other hand, the energy may
not be sufficient to achieve these results, yet it must leave
some traces behind at that point of the surface where the
blow struck, that is to say, the point of impact. We will
thus have a wide range, beginning with the inefficient blow,
that is to say, a blow which was not sufficient to detach
a flake, and ending with a blow of such energy not only
to detach a flake, but to give rise to numerous accessory
marks of percussion. Between these two extremes there
must be various stages, according to the force of energy
applied and the result achieved.
My studies have led me to believe that, near to the
Percussion face, the five accessory marks of percussion are
the surest signs of human agency. Retouches or rough
marginal chipping may be produccd by natural agencies,
tending to press or break off small splinters, but the marks
here described can only be produced by a hammer striking
one point of the surface, and not penetrating into the
matrix.

Item Type:	Article
Authors/Creators:	Noetling, Fritz
Keywords:	Royal Society of Tasmania, Van Diemens Land, VDL, Hobart Town, natural sciences, proceedings, records
Journal or Publication Title:	Papers and Proceedings of the Royal Society of Tasmania
ISSN:	0080-4703
Collections:	Royal Society Collection Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:	In 1843 the Horticultural and Botanical Society of Van Diemen's Land was founded and became the Royal Society of Van Diemen's Land for Horticulture, Botany, and the Advancement of Science in 1844. In 1855 its name changed to Royal Society of Tasmania for Horticulture, Botany, and the Advancement of Science. In 1911 the name was shortened to Royal Society of Tasmania.
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