Chambers's Journal of Popular Literature, Science, and Art, fifth series, no. 130, vol. III, June 26, 1886 — John Shaqi
Chambers's Journal of Popular Literature, Science, and Art, fifth series, no. 130, vol. III, June 26, 1886Various
History
Chambers's Journal of Popular Literature, Science, and Art, fifth series, no. 130, vol. III, June 26, 1886
Various
Periodicals
A clever method of damascening metals by electrolysis is described
in a French technical journal. The process consists of two distinct
operations, and is based on the well-known fact, that when two copper
plates are hung in a bath of sulphate of copper and connected with
the opposite poles of a battery, a transfer of metal from one to the
other will take place. In the case before us, a copper plate is covered
with a thin layer of insulating material, as in the etching process,
and this is drawn upon with an etching needle so as to lay bare the
metal beneath. This is now submitted to the action of the electric
current, so that the metal is eaten away to a certain depth in the
exposed parts. The plate is next washed with acid, to remove all traces
of oxide of copper in the bitten-in lines, and is then transferred
to another bath by which metallic silver or nickel is deposited in
the etched parts, with the result that the sunk lines are ultimately
completely filled with the new metal. When the plate is relieved of
its waxy coating and is polished, it is impossible to say whether or
not the beautiful inlaid appearance has been produced by a mechanical
process or by skilled handiwork.
Two remarkable finds of old coins have lately occurred—one at
Milverton, a suburb of Leamington; and the other at Aberdeen. In
the first case, some labourers were digging foundations, when they
found a Roman amphora, which they immediately smashed to ascertain
its contents. It contained nearly three hundred coins in silver and
copper. These were of very early date, and in a state of excellent
preservation. The Aberdeen treasure trove came to light in excavating
Ross’s Court, one of the oldest parts of the city. Here the labourers
found a bronze urn filled with a large number of silver coins. These
coins also are well preserved. They are all English, and are mostly
of the reigns of Edward I. and Edward II. Some of these coins are of
extreme rarity, and the discovery has great antiquarian interest.
Public-domain text, read in full here on John Shaqi.
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