Annual report of the Regents . 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 m
Annual report of the Regents . 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 Alumina . . Oxid of iron. Lime ...... Magnesia . . tr. . tr. Alkalis .... 92. Yl o XI 0)fcJD a 0)O H CO 1—4. 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 Alumina Ferrous oxid Lime Magnesia Carbonic acid Sulfuric acid Potash Soda Combined water WMte clay froi^North tort Black clay fromNorthport White clayf omSeae iff .90 .35 tr. .84 .34 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 brickl
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