On the Economy of Machinery and ManufacturesBabbage, Charles
ReligionComparative
On the Economy of Machinery and Manufactures
Babbage, Charles
Machinery; Manufactures
113. Of bricks and tiles. An oblong box of wood fitting upon
a bottom fixed to the brickmaker's bench, is the mould from which
every brick is formed. A portion of the plastic mixture of which
the bricks consist is made ready by less skilful hands: the
workman first sprinkles a little sand into the mould, and then
throws the clay into it with some force; at the same time rapidly
working it with his fingers, so as to make it completely close up
to the corners. He next scrapes off, with a wetted stick, the
superfluous clay, and shakes the new-formed brick dexterously out
of its mould upon a piece of board, on which it is removed by
another workman to the place appointed for drying it. A very
skilful moulder has occasionally, in a long summer's day,
delivered from ten to eleven thousand bricks; but a fair average
day's work is from five to six thousand. Tiles of various kinds
and forms are made of finer materials, but by the same system of
moulding. Among the ruins of the city of Gour, the ancient
capital of Bengal, bricks are found having projecting ornaments
in high relief: these appear to have been formed in a mould, and
subsequently glazed with a coloured glaze. In Germany, also,
brickwork has been executed with various ornaments. The cornice
of the church of St Stephano, at Berlin, is made of large blocks
of brick moulded into the form required by the architect. At the
establishment of Messrs Cubitt, in Gray's Inn Lane, vases,
cornices, and highly ornamented capitals of columns are thus
formed which rival stone itself in elasticity, hardness, and
durability.
114. Of embossed china. Many of the forms given to those
beautiful specimens of earthenware which constitute the equipage
of our breakfast and our dinner-tables, cannot be executed in the
lathe of the potter. The embossed ornaments on the edges of the
plates, their polygonal shape, the fluted surface of many of the
vases, would all be difficult and costly of execution by the
hand; but they become easy and comparatively cheap, when made by
pressing the soft material out of which they are formed into a
hard mould. The care and skill bestowed on the preparation of
that mould are repaid by the multitude it produces. In many of
the works of the china manufactory, one part only of the article
is moulded; the upper surface of the plate, for example, whilst
the under side is figured by the lathe. In some instances, the
handle, or only a few ornaments, are moulded, and the body of the
work is turned.
Public-domain text, read in full here on John Shaqi.
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