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The kieselguhr industry
382
CURRENT TOPICS.
[J. F. I.
The Kieselguhr Industry. P . A . BORCK. (Metall. and Chem. Engin., xii, IO9.)--This article treats of the properties of kieselguhr, its occurrence at Lompoc, California, and other places, and its treatment. Natural blocks can be obtained by sawing the material; these blocks are fairly strong, have a high insulating value, stand heat and cold well, except as to a slight shrinkage, and melt at I6TO° C. Light-weight kieselguhr bricks are produced by properly burning the material; they insulate well up to red-heat, but shrink at high temperatures, and'must be protected against sudden changes of temperature. They are recommended as backing for more refractory bricks.
Repeated Use of Lubricating Oil after Filtration. G. F. FENNO. (Min. and Eng. World, xl, 835.)--In an installation fitted with a Richardson central oiling and filtering system, a high grade mineral oil was supplied continuously to the bearings, and, after filtration and removal of water, was used over and over again. After I8 months the oil was found to have increased somewhat in specific gravity and viscosity, owing to admixture with some of the cylinder oil. The fresh oil showed a slighter lower coefficient of friction on low-bearing pressures, while the friction coefficient of the filtered oil was lower on higher-bearing pressures, but the difference was so small as to be negligible under working conditions. The saving in cost of oil with a plant using two Richardson filters, each taking about 75 gallons per hour, is estimated at $2ooo per month.
PRESS OF J , B, LIPPINCOTT COMPANY PHILADELPHIA
CURRENT TOPICS.
[J. F. I.
The Kieselguhr Industry. P . A . BORCK. (Metall. and Chem. Engin., xii, IO9.)--This article treats of the properties of kieselguhr, its occurrence at Lompoc, California, and other places, and its treatment. Natural blocks can be obtained by sawing the material; these blocks are fairly strong, have a high insulating value, stand heat and cold well, except as to a slight shrinkage, and melt at I6TO° C. Light-weight kieselguhr bricks are produced by properly burning the material; they insulate well up to red-heat, but shrink at high temperatures, and'must be protected against sudden changes of temperature. They are recommended as backing for more refractory bricks.
Repeated Use of Lubricating Oil after Filtration. G. F. FENNO. (Min. and Eng. World, xl, 835.)--In an installation fitted with a Richardson central oiling and filtering system, a high grade mineral oil was supplied continuously to the bearings, and, after filtration and removal of water, was used over and over again. After I8 months the oil was found to have increased somewhat in specific gravity and viscosity, owing to admixture with some of the cylinder oil. The fresh oil showed a slighter lower coefficient of friction on low-bearing pressures, while the friction coefficient of the filtered oil was lower on higher-bearing pressures, but the difference was so small as to be negligible under working conditions. The saving in cost of oil with a plant using two Richardson filters, each taking about 75 gallons per hour, is estimated at $2ooo per month.
PRESS OF J , B, LIPPINCOTT COMPANY PHILADELPHIA