Volume 2

Applied chemistry; in manufactures, arts, and domestic economy / Edited by Edward Andrew Parnell.

  • Parnell, Edward A. (Edward Andrew)
Date:
1844
Catalogue details

Licence: Public Domain Mark

Credit: Applied chemistry; in manufactures, arts, and domestic economy / Edited by Edward Andrew Parnell. Source: Wellcome Collection.

    83/490 (page 65)
    ing-pots, and for the pots called the “ squares ” or “cuvettes7’ (the use of which will he described pre¬ sently), are placed in a range along the middle of the room lengthways, and occupy about one-third of the area of the room. The principal furnace, con¬ taining the melting-pots, is in the middle of this line. It holds six pots, similar in shape to the pots of the crown-glass house (page 33), each being large enough to contain very nearly a ton of melted glass. The average duration of these pots is nine months. The furnaces for the squares are not so large as the fur¬ nace for the melting-pots; each contains eight or nine squares, which are cubical-shaped pots, the length of each of the sides of which is about twenty- two inches. The floors of the furnaces on which the squares stand are on a level with the hall, and the arrangement of the furnaces is such as to allow of the ready introduction and removal of each of the squares. The annealing arches, of which there are forty-four at Ravenhead, are arranged in two rows along the sides of the hall, the wall of the hall form¬ ing one end of the arches. The opening of the arch through which the hot plates are introduced is quite similar to the opening of the arch represented in fig. 15, page 54, and is on a level with the table on which the plate is cast. The floor of the arch is about six inches lower than the bottom of the open¬ ing, the descent being moderated by a short slope. Each arch is about twelve or thirteen feet wide and forty feet deep, being capable of containing four or five plates of the largest dimensions which are cast. The plates lie flat on the floor of the arch, and not VOL. II. F