(2) One one-inch wrought iron nipple, two inches long, one-inch thread
on one end.
(3) Two four-inch malleable iron caps, drilled and tapped for a
one-inch pipe.
(4) One one-inch wrought iron pipe, twenty-four inches out to out,
with a three-inch straight thread on each end.
(5) Two one-inch iron caps. A hole, one-eighth of an inch in diameter,
is drilled in the end of one of these caps.
The above order can be given _literatim_, and will be understood by
the dealer, who will furnish, at a trifling cost, the materials, cut
and tapped as ordered.
Fig. 1 shows how the whole is put together. The numbers on the figure
correspond also to the numbers of the paragraphs of the order as given
above.
[Illustration: FIG. 1.]
[Illustration: FIG. 2.]
Fig. 2 is an end section. A cork is inserted in 2 and through it a
thermometer, the bulb of which is on a level with the interior pipe.
The whole is supported on a few bricks at either end, and is kept
steady and in place by a couple of weights or half bricks. It is
heated by one or two Bunsen burners, according to the temperature
desired.--_Jour. Fr. Institute_.
* * * * *
TESTING CEMENT.
An improved method of testing Portland cement has been adopted by M.
Deval, Chief Superintendent of Bridges and Roads, who has charge,
under M.
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