. American engineer and railroad journal . ease, Assistant Chem-ist, of the Railroad. is well known, spirits of turi)entino, so largely useil as aconstituent of paints, japans, and varnlsh<s, is a distillate fromcertain species of pine, or from the pitch from tliese common adulteration In the markets of this country ap-pears to be petroleum in some form, although it is quite possi-ble that rosin spirits, or the undistilled pitch, or even rosin,may bo added. It is not expected that the tests that are de-scribed below will insure that nothing liut pure s
. American engineer and railroad journal . ease, Assistant Chem-ist, of the Railroad. is well known, spirits of turi)entino, so largely useil as aconstituent of paints, japans, and varnlsh<s, is a distillate fromcertain species of pine, or from the pitch from tliese common adulteration In the markets of this country ap-pears to be petroleum in some form, although it is quite possi-ble that rosin spirits, or the undistilled pitch, or even rosin,may bo added. It is not expected that the tests that are de-scribed below will insure that nothing liut pure spirits of tur-pentine is present in the sample examined, or in other words,that none of the sophistications above mentioned, or indeedothers not enumerated, may not be present in small amountIt is believed, however, that a material that successlully passesthese tests will give satisfactory results in actual use, eitheras a constituent of paint, japan or varnish. During an experi-ence of over five years with these tests, using them on from. The Westphal Balance. ten to fifteen shipments a month, very few complaints havearisen, notwithstanding the shipments are used by a largenumber of different painters. The tests which are applied toeach sample representing a shipment, are gravity, distillationpoint, residue on evaporation and treatment with oil of methods are described in detail below. specifications require that the sample shau not show agravity less than at a temperature of 59 degrees Fahren-heit. In taking the gravity of this , the Westphal bal-ance is always used, as follows: Set up the balance on a levelplace, by placing the beam in position and hanging the plum-met on the hook provided for it. Now adjust with the ad-justing screw in the foot until the pointers are exactly oppositeeach other, cool the liquid to be tested to a point a little lowerthan that required by the specification, fill the jar withenough of the liquid, to a lit
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
