File:Annual report of the Regents (1900) (14778948392).jpg

Identifier: annualreportof5421900newy (find matches)
Title: Annual report of the Regents
Year: 1889 (1880s)
Authors: New York State Museum University of the State of New York. Board of Regents
Subjects: New York State Museum Science
Publisher: Albany : J.B. Lyon, State Printer
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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9. 29 Northport. The IsTortliport clay and fire sand co. has an exten-sive series of pits on Littleneck near !Rorthport. Both fire sand andclay are obtained. The clay bank has a hight of about 40 feet, theclay is of a bluish black and yellowish white color. The darkerclay is the lower, and contains much carbonaceous matter. Thedeposit is stratified, the layers of clay being separated by thin sheetsof a rather coarse sand. It is shipped chiefly to New England. At the eastern side of the bank a bed of white clay underliesthe fire sand, but little of this has been mined. The following are analyses of ISTew York stoneware clays andkaolin. Elm point Glencove Litleneck Kreischervil e KaoUn Kreischer- ville Silica 62.06 Y0.45 62.66 64.26 82.51 Alumina . . . 18.09 21.74 18.09 24.76 11.57 Oxid of iron. 5.40 1.72 0.97 0.83 0.63 Lime ...... 1.05 0.24 0.79 0.73 0.29 Magnesia . . . tr. 0.30 . tr. 0.78 Alkalis .... 6.11 5.00 2.23 2.35 2.66 92. Yl 99.45 84.74 92.93 98.44 o XI 0)fcJD a 0)O H CO 1—4
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o op. ,a uo a 0) > <t-i <u o . Xi ■4-> ort ■t-> XI o p. <P u •o a fl ft 3 tf a o X o CLAYS OF )^EW YORK 821 The following are analyses of Long Island stoneware clays madeby C. H. Jouet. (School of mines quart. Jan. 1895) Silica 68.34 Alumina 19.89 Ferrous oxid Lime Magnesia Carbonic acid Sulfuric acid Potash Soda Combined water WMte clay froi^North tort Black clay fromNorthport White clayf omSeae iff 68.34 58.84 62.35 19.89 23.40 23.14 .90 1.18 1.12 .35 tr. 1.03 1.09 3.55 5.04 3.17 .84 .34 1.76 6.03 9.20 6.77 99.90 99.03 99.40 A physical test of the yellow clay from the pits of the l!Torthportclay and fire sand co. gave the following results. It took 25^ ofwater to mix the clay up to a workable mass, that was very gritty,but possessed good plasticity. The tensile strength of the clay doesnot stand in direct relation to the plasticity, as the average is only25 pounds a square inch with a maximum of 30 pounds. Theair shrinkage of the brickle

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