3 58
T H E J O U R N A L OF IiVDCSTRIAL A X D ENGINEERING CHEiVISTRY
the Volhard and Mohr methods showed that o . o ~ Nammonium thiocyanate and the o 01N silver nitrate solutions are too dilute to obtain sharp color changes a t the end of the reactions. Careful manipulation with a O.IN solution yields as accurate results as the use of more dilute solutions. Comparing the Volhard and Mohr methods, using o I N solutions, the former yielded more satisfactory, concordant and accurate results, although requiring more time. Many determinations on 24 samples of surface water from Leon County in western Florida, about thirty miles inland from the Gulf of Mexico, showed that they contained from 7 to 24 parts per rgillion of chlorine, the average being 1 2 parts per million. Rain water in this locality, one determination, was found to contain when concentrated to one-tenth of its volume 0.9 part per million of chlorine, equivalent to 1.4 parts per million of sodium chloride. A t the Dry Tortugas’ the chlorine content is 2.9 parts per million corresponding to 5 parts per million of sodium chloride. A few chlorine determinations on surface waters from Pensacola, on the Gulf, in Escambia County, showed from 2 1 to 42 parts per million of chlorine. CHENlrCAL LABORATORY C. A. BRAUTLECHT FLORIDA STATECOLLEGE FOR WOMEN B , x, ~~~~~s~ TALLAHASSEE, March 1, 1915 ACTION OF THE NEW ENGLAND DYE COMMITTEE The New England Section of the Society of Chemical Industry having requested the Northeastern Section of the American Chemical Society to join with them in appointing a committee to consider the manufacture of dyestuffs in the United States, it was voted that the President of the Section be authorized to appoint such a committee. The representatives of the two sections were as follows : NORTHEASTERK SECTIONA. C. S. NEN E N G L A ~ SECTION ~D S. C. I. Eugene Barry F, G. Stantial A. A. Claflin C. A. West a’.D. Livermore S. W. Wilder
John Alden W. B.-Nye W. K. Robbins
C. L. Gagnebin Grinnell Jones J , Russell Marble
On January 29th, a t a joint meeting of the New England Section of the Society of Chemical Industry and the Northeastern Section of the American Chemical Society, the Joint Committee on Dyestuffs presented its report through its Chairman, Mr. s. W. Wilder. After a lengthy discussion, Prof. H. P. Talbot offered an amendment to the report which was accepted by the committee, and the following amended report was unanimously passed. “In the opinion of this committee there is no insuperable chemical or physical obstacle to the establishment of a coal-tar industry in this country, but we believe this is an economic question on which i t is outside the provinces of these societies to make a recommendation. “The subject is one of great importance to the chemical industries of the United States, and should be investigated by Congress.
The 2nd annual meeting of the chemical engineers of the University of Kansas was held on March 12th. The program was as follows: Opening Remarks, by Dean P. F. XValker and Prof. W. A. Whitaker; “The Technology of Clay Refractories,” Mr. Paul Teetor, clay investigator, Uniwrsity ol Kansas; “Rock Salt Mining in Kansas,” Mr. Sam. Ainsworth, mining engineer, Lyons, Kansas; “ Chemical Process Control,” Mr. William J. Kee, Jr., supt., National Zinc Co., Kansas City, Kansas; “The Chemist in Commerce,” Mr. Rudolph Hirsch, chemist, Ridenour-Baker Co., Kansas City, Missouri; ‘ I Manufacture of Portland Cement,” Mr. Chris Goll, chemist, Bonner 8
U. S. Geol. Survey, Bull. 319.
Vol. 7 , KO.4
TO CHANGE THE SPECIFIC GRAVITIES OF SOLUTIONS
Editor of the Journal of Industrial and Engineering Chemistry: As students are constantly required to alter the specific gravities of solutions for reagent purposes, it would seem that simple arithmetic would be as often applied as the hydrometer, But such is not the case and when the hydrometer is misplaced, trouble very often begins. The following formula will suffice in such a case. If
Then
X = Volunie of water (sp. gr. 100) to be added to original solution S = Specific Gravity of original solution V = Volume of original solution SI = Specific Gravity of required solution
(S x V)
+ ( X x 1.00) = (S’ x
whence,
4- X) s1
= E - 2 1 2
s1-
1
As the quantities S,SLand V are known, substitution in the last equation gives the desired information. E. S. RECLAMATION SERVICE p. F. BOX‘ARD, Chemist SAXFRANCISCO, January 25, 1915 .-
PLATINUM THEFT
-1 professional platinum thief has stolen about $3100 worth of platinum from me. He answers the following description: age about 3 j , prominent nose, peculiar eyes, red hair, freckled face, Boston accent, two large X-Ray burns on his left arm. Height about 5 feet I O and weight about 180. This note is intended as a warning to other owners of platinum. HAHNEMAKX MEDICALCOLLEGE W.A . PEARSON, Dean PHILADELPHIA, March 3, 1915
HYDROMETALLURGICAL APPARATUS-CORRECTION In my article under the above title, which appeared in THIS 7 (1915), I 19, the following corrections should be made in addition to those already noted onpage 261 of theMarchissue: I n Table I, page 121, the first heading under “Sand” should 100, and not f zoo as given. be Table 111, page 124, under remarks in connection with the Porcupine-Crown, Ontario, the figure 83 should read 73 per cent solids. Page 1z7-The results of the calculation dealing with the Continuous Counter-Current Decantation flow sheet, Fig. I I , are not quite accurate, owing to the value of “Z” not having been carried out far enough. The results should be: V = 2.673, J%r = 1,173, x = 0.298, IT= 0.079, Z = 0.039. Page 129-The value of 2 should be “2.1164 lbs.,” instead of “2.7164 lbs.,” which means that “2-Solution wasted with the residue, 2, contains 0.1 per cent copper, or 2.1 lbs. per ton of ore.” JOHN V. N. DORR 30 CHURCH STREET,Xnm YORK JOURNAL,
+-
March 15, 1915
Portland Cement Co., Bonner Springs, Kansas; “The City Milk Problem,” Mrs. George H. Hoxie, Consumers League, Kansas City, Missouri, Mrs. Joseph W,Murray, former food analyst, State Laboratories, Dr. F. H. Billings, prof. of bacteriology and Dr. E. W.Burgess, assistant professor of sociology, University of Kansas. In the evening a “chemical smoker” was given in Eagles’ Hall. Prof. R. W. Thatcher, chief of the division of agricultural chemistry of the University of Minnesota, has been elected president of the Minnesota Section of the A. C. S. The section will hereafter hold regular meetings on the third Friday evening of each month a t various laboratories in the Twin Cities.
