Notes on the manufacture of earthenware by Sandeman Ernest Albert

Author:Sandeman, Ernest Albert
Language: eng
Format: epub
Tags: Pottery
Publisher: London, C. Lockwood and son
Published: 1917-03-25T05:00:00+00:00

which would crack and break saggers and dunt ware. Also in cooling, without bars the air had to pass through a big body of slowly dying fire, and thus the oven cooled far more slowly than if bars were used. In the latter case, the fire -being smaller and soon dying down, the cold air would quickly obtain admission and thus cause dunted (cracked) ware, &c. But these inconveniences do not arise if care is exercised, and the combustion being much more perfect with bars, bars are gradually being adopted almost everywhere, both for biscuit as well as glost in all classes of ovens.

The Skeleton Oven. —This is an oven which of late years has become exceedingly popular, and it seems to combine all the best qualities of the different up-draught ovens. It is simple in working, easy to repair, clean, and it gives satisfactory results. It is proposed, therefore, to give rather a fuller description of it with some measurements.

As a rough-and-ready rule, biscuit ovens should be about 18ft. 6 in., and glost about 14ft. 6 in., interior measurement. These are nice, workable sizes. Biscuit ovens much larger than this, of 21 and 22ft., and glost of 18 to 20ft., will give fairly satisfactory results; but these very large ovens, though economical in that they will fire more ware with a proportionately less quantity of coal, require most careful attention to get a regular heat all over them, and the general consensus of opinion is against ovens of over 20 ft.

Large ovens take long*er to set in and draw, and longer to cool, and for the general manufacturer, ovens that can be got quickly in and out are the best, as it is then easier to " get up " orders, and the packers are kept regularly at work as there are constantly ovens being drawn. The broad principle in the construction of a skeleton oven is that the stack is supported round

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