Public works . ER .\fter seven years of experimentalwork an electrically controlled penetrom-eter has been perfected, for use intesting laboratories, to automatically timepenetration tests of plastic substances. It is manufactured by Howard &Morse and is recommended by them forthe elimination of personal equationwhen testing asphalt, bitumen, tar, rubber and other material, where the un-known factor of human error is claimedtl be replaced by clockwork instrument contains a timing de-vice by means of which an electric cur-rent, acting through a magnet, releasesa bar carrying the pe
Public works . ER .\fter seven years of experimentalwork an electrically controlled penetrom-eter has been perfected, for use intesting laboratories, to automatically timepenetration tests of plastic substances. It is manufactured by Howard &Morse and is recommended by them forthe elimination of personal equationwhen testing asphalt, bitumen, tar, rubber and other material, where the un-known factor of human error is claimedtl be replaced by clockwork instrument contains a timing de-vice by means of which an electric cur-rent, acting through a magnet, releasesa bar carrying the penetration needle,allowing penetration to be effected for agiven period, at the expiration of whichthe bar is automatically clamped by themagnet and the depth of penetrationmeasured. The instrument can be connected tosix dry cells or their equivalent or thecurrent inay be supplied from 110 voltdirect circuit, connecting through a re-ducer or from 110 volt alternating cir-cuit, connecting through a SELO .METHOD CHEMICAL The continuous flow sewage plaAt, Selomethod of electro chemical processluirification, is described in a Monographissued with compliments of GelinasEngineering Inc., licensee of thepatented Selo method. This method, largely automatic inoperation, is claimed to produce any de-sired purification ranging from theseparation of the solids to a very com-plete elimination of germs, according tothe varying requirements of the stateboards of health, and producing a productof known purity at a fixed price. This method, which requires only arelatively small acreage, delivers thesewerage, directly from the sewer to ameasuring chamber where a float valveoperates the automatic control of chem-ical and electricity in proportion to thevarying flow of the sewage. The sewage then passes to the agita-tor where it is mixed with a chemicaland passes into a large tank, flowing inthrough the center, and out over the action of the chemical and the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
