Oak bark (kirmess).
Sumac.
Chestnut wood extract.
Quebracho " "
Some gambier.
_Italy_.
Oak bark.
Pine "
Sumac.
Valonia.
_England_.
Oak bark.
Divi divi.
Myrabolams.
Valonia.
Mimosa.
Extracts { Oak bark and wood hemlock.
Gambier.
Cutch.
_Germany and Austria_.
Oak bark.
Pine "
Willow bark.
Valonia.
Knoppern.
Myrabolams.
{ Oak bark and wood.
Extracts { Pine bark and wood.
_Russia._
Birch bark.
Willow "
Oak "
Pine "
Hemlock extract.
_Norway and Sweden_.
Birch bark.
Willow "
Oak "
WALTER J. SALOMON.
--_Shoe and Leather Reporter_.
* * * * *
AN APPARATUS FOR HEATING SUBSTANCES IN GLASS TUBES UNDER PRESSURE.[1]
[Footnote 1: Read at the meeting of the Chemical Section of the
Franklin Institute held March 17, 1891.]
By H. PEMBERTON, Jr.
Chemists who do not happen to have in their laboratories oil or air
baths for heating closed tubes can make an air bath at short notice
from materials furnished by all dealers in steam fittings.
_Order_:
(1) One four-inch wrought iron pipe, eighteen inches out to out, with
usual thread on each end. At about nine inches from either end this
pipe is drilled and tapped for a one-inch nipple, in such a manner
that a pipe introduced would pass, not on a line with the radius, but
about half way between the axis of the four-inch pipe and its walls;
in other words, it would be on a line with a chord of the circle.
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