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

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Chapter

Document type:: Multivolume work

Structure type:: Chapter

Title:: Pittsburgh Clay Pot Company

Collection:: Economics Books

in the manufacture of glass melting pots of all kinds, during which it has established an enviable reputation as producers of the highest grade glass melting pots and glass furnace refractories in general. The foundation of good pot making is the nature of the clay used, quality being the one prin- ciple which guides this company in the selection of clays. Keeping in constant touch with sources of supply, and by frequent careful tests, the company is assured that its pro- ducts are fully up to the standards its officials have set. After receiving the raw clays from the mines, these clays are all thoroughly inspected and picked by hand. All doubtful or inferior clays are immediately rejected, and extreme care is used to see that only the very best of ma- terial enters into the composition of the pot. The com- pany has facilities for burning such clays as are used in the batch in the burned condition, and these clays are all in- spected again after burning, The next process consists of grinding and screening the various clays which enter into the pot mixture. It is highly important that the various clays be screened to the size that will give the best results in.the finished pot, and this detail is looked after with the closest attention. The various clays are intimately mixed in the proper propor- tions, and then passed through “pug mills,” in order that the batch may be thoroughly amalgamated. After this mix- ing and pugging process is completely accomplished, the batch is stored in bins to age or ripen. The proper aging of pot and tank block clays is of great importance, and the company has bins capable of holding a year’s supply of clay, in order that the aging may be properly accomplished. During the aging process the batch is transferred from one bin to another, being again thoroughly pugged at each transfer Pot clay usually requires from eight months to one year to age, in order to make it a homogeneous mass. After the clay is properly aged it is again pugged and transferred to the trampers’ box, where it is kneaded by the bare feet of the clay trampers. It is then made into small rolls suited to fit the hand of the pot maker.

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