A Text-book of Tanning: A treatise on the conversion of skins into leather, both practical and theoretical.Procter, H. R. (Henry Richardson)
Science
A Text-book of Tanning: A treatise on the conversion of skins into leather, both practical and theoretical.
Procter, H. R. (Henry Richardson)
Tanning
In the 6th or following year, a similar number of
trees would be stripped: the bark having increased
in weight (say 14 lb.), the increased yield of 2nd
stripping would be 400 tons at 4_l._ per ton 1600 0 0
In the 7th year, the remaining trees would be
stripped, from which a still greater increase would
be obtained, say 480 tons at 4_l._ per ton 1920 0 0
Total yield of bark 4852 0 0
The cost of stripping would not exceed 15_s._ per ton,
on account of the facilities presented by the
regularity of the trees, while carting would represent
another 10_s._ per ton: these combined
charges would be 25_s._ per ton, and on 1215 tons,
would be 1515 0 0
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Leaving a clear profit on the 100 acres of £2637 0 0
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The exports of mimosa-bark in 1876 were 11,899 tons from Victoria,
4758 from South Australia, and 1735 from Tasmania. Later returns are
included in barks, p. 39. Shanghai imported 7038 _piculs_ (of 133-1/3
lb.) in 1879. The approximate London market values of mimosa-bark
are:--Ground, 6-13_l._ a ton; chopped, 5-12_l._; long, 5_l._-9_l._
10_s._ A very superior extract has been made from this bark.
=Myrobalans or Myrabolams.=--The fruits of several species of
_Terminalia_ constitute the myrobalans of commerce; they are chiefly
_T. Chebula_ and _T. Bellerica_, natives of India, the former being
a tree 40-50 ft. high, and esteemed for its timber also. The fruits
contain 30-35 per cent. of gallotannic and ellagitannic acids,
producing a soft and porous tannage, and good samples giving a
bright-yellow colour. The tannin exists in the pulp, and is absent from
the very hard "stone." The dried fruits are known locally as _har_,
_harra_, or _bahera_, and are used commonly for dyeing, but not for
tanning.
Our imports of myrobalans in 1880 were:--238,151 cwt., 121,465_l._,
from Bombay and Sind; 115,670 cwt., 51,339_l._, from Madras; 11,020
cwt., 4717_l._, from Bengal and Burma; 3520 cwt., 1402_l._, from other
countries; total, 368,361 cwt., 178,923_l._ Our re-exports in 1880
were 8015 cwt., 4328_l._, to Germany; 16,127 cwt., 8515_l._, to other
countries; total, 24,142 cwt., 12,843_l._ The approximate London market
values of myrobalans are 7-14_s._ a cwt. for good, and 5-10_s._ for
common. Shanghai imported 4403 _piculs_ (of 133-1/3 lb.) in 1879.
Public-domain text, read in full here on John Shaqi.
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