The story of Pittsburgh: Clay products

Clay products (Vol. 1, nr. 9)

Bibliographic data

Multivolume work

Identifikator:: 1831622599

Document type:: Multivolume work

Title:: The story of Pittsburgh

Place of publication:: Pittsburgh

Publisher:: First National Bank

Year of publication:: 1919-1930

Collection:: Economics Books

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Volume

Identifikator:: 1831623366

URN:: urn:nbn:de:zbw-retromon-239809

Document type:: Volume

Title:: Clay products

Volume count:: Vol. 1, nr. 9

Place of publication:: Pittsburgh

Publisher:: First National Bank

Year of publication:: 1922

Scope:: [ca. 24] Seiten

Digitisation:: 2022

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

Chapter

Document type:: Multivolume work

Structure type:: Chapter

Title:: Pittsburgh Clay Pot Company

Collection:: Economics Books

In making the pots the bottoms are made first. These being made to the proper size and thickness, they are turned and the knuckle or joint between the side wall and the bottom of the pot is formed. The side walls are built by “spells,” the potmaker moving from one pot to another in his set, and building about six inches to the height of each pot every 48 hours. This allows the various spells time to stiffen, which prevents the lower spells of the pot from sagging. Care also must be taken to see that the upper part of each spell is kept moist, in order that the next spell succeeding it can be properly kneaded. In order to make a seamless wall for the pot, this process is continued until the crown is turned in and finished, after which the hood is worked on and the pot is thoroughly cleaned and smoothed. It usually requires from six to twelve months from the time the pot is made before it is permissible to be placed in a furnace. The manufacture of Tank Blocks is also a long and tedious operation. The clay for the various sizes and shapes is rammed into moulds by pneumatic clay rammers. These blocks are placed in drying rooms, with temperature ranging from 90 to 110 degrees, for a period of from one to three months, in order to be thoroughly dried before burn- ing. They are then placed in large kilns, and burned by natural gas, up to a temperature of 2450 degrees Fahren- heit. This burning process requires about three weeks time. Previous to the organization of the Pittsburgh Clay Pot Company, in 1879, there had been but one concern in the United States, Thomas Coffin and Company, upon which the glass factories had to depend for their supply of one of the most important and absolutely necessary articles in the manufacturing of glass, namely: glass melting pots. Recognizing the great growing demand for glass ware, and Pittsburgh being the center of this industry, a number of prominent glass manufacturers of the Pittsburgh district organized the Pittsburgh Clay Pot Company, and pur- chased the Hostetter Graphite Factory on South Avenue, which consisted of a five-story building 100 x 100 feet. In 1883 another five story building 140 x 110 feet and a

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