File:Appendix to the Journals of the Senate and Assembly of the session of the Legislature of the State of California (1917) (14784150105).jpg

Identifier: appendixtojourna19177cali (find matches)
Title: Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California
Year: 1853 (1850s)
Authors: California. Legislature
Subjects: Legislative journals
Publisher: Sacramento : State Printing
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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eet over considerable areas andis said to crack much less easily than Portland cement. The use ofsawdust makes the material very much lighter in weight than cement,less hard, and more resilient (U. S. G. S. Bull. 355, p. 13). Solublesilicates of the nature of water glass are also used. A similar magnesia NAPA COUNTY. 273 cement is used as a paint, but, of course, applied thinner. Such amagnesite paint was used as a finishing coat on the concrete build-ing of the First National Bank at Healdsburg (see photo No. 153).**Porcelith and liquid stone are two brands prepared by San Fran-cisco firms from California magnesite. The former has been used on anumber of buildings in San Francisco, notably the Hotel Shasta atKearny and Bush streets. It is applied with a brush. The manufac-turers state that in using porcelith on brick or concrete walls, a gallonwill cover about 70 square feet (two coats), and for cement plaster orsmooth surfaced concrete walls from 110 to 120 square feet to the gallon
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Photo No. 153. First National Bank Building, Healdsburg. California. A concrete building finished with a magnesite paint. according to the porosity of the walls. For use on wood it may bemixed thinner and sprayed on. For wood, it acts as a fire retardant. In paper manufacture, in the sulphite process, a milk of lime andmagnesia (calcined magnesite) is used as a carrier for SO2, the gasbeing held in the mixture under pressure and thus introduced into thedigester. The sulphurous gas digests the wood, leaving the fiber whichis washed and used in making newspaper stock, wrapping paper, andthe poorer grades of other printing and writing papers. The uses ofthe carbonic acid gas derived from calcinging magnesite are well known:carbonating beverages, refrigeration, etc. For these purposes it isliquefied by compression, to facilitate its transportation. CO2 frommagnesite is also used in borax refining. At the present time, however,as lime rock is obtained more cheaply, no magnesite is being us

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