Sept., 1912
T H E J O CR-Y-AL OF I - Y D L ~ S T R I A LaAvDESGI-YEERI~YG C H E M I S T R Y .
on the Pacific Coast are too uncertzin as yet t2 justify any definite estimates, and opinions only are hardly worth offering. FR.ASK K. CAMERON.
the determination of furnace efficiency involves analysis of the flue gases, a chemical process involving the handling of the delicate gas analysis apparatus, a n operation requiring some little skill and more or less constant attention from day t o day. This same skill, however, is not greater than necessitated by many other operations carried on daily by the stationary engineer. Why, then, is this not done? Simply because the man who has charge of the boiler room has not been trained in these lines as he has in others. Right here lies the opportunity for the chemist, if there be one connected with the plant, to make a great saving in operating expenses, with a minimum amount of effort and time on his part. I n those plants where I found furnace efficiency at the highest and the instruments for its determination in successful operation, this part of the work was in charge of the chemist. It took very little of his time for a reliable laboratory boy had been trained to do most of the work and make R. C. BENNER. the necessary reports.
BUREAUOF SOILS, DEPARTMENT O F AGRICUI.TURE. WASHINGTON.
ORDINARY WRITING FLUID FOR MARKING PORCELAIN CRUCIBLES. Editor of the Journal o j Industrial and Engineering Chemistry: In the article on “Marking Porcelain and Silica Crucibles, etc.,” published on page 567 of the August issue of THISJOURNAL, I note the author has experienced a great deal of difficulty in permanently marking glazed crucibles and also note that he has gone to considerable trouble to remedy this difficulty. While I was employed as “helper” in the U. S. Food and Drug Inspection Laboratory, Portland, Oregon, the same trouble was experienced there, as it is no doubt in most laboratories. We had been marking the crucibles on the bottoms with a piece of magnetite or some other iron ore, but this was impractical, as each crucible had to be lifted up to read the number, so I tried the iron in the form of ordinary black Xvriting fluid from my fountain pen, on the glazed side of the crucibles. The method is as follows: The crucibles are washed and dried with a clean towel, the numbers put on with the pen and dried carefully so as not to make the outlines of the figures ragged, by holding them about a foot above the Bunsen burner. The ink is applied two or three times, drying after each application and holding in a position so that it will dry in a uniform mark. .$fter the ink is well set, the crucible is held in the flame and heated for about two minutes after i t has become red hot. This oxidizes the iron in the ink and burns i t into the porcelain, thereby marking it with a beautiful reddish gold numeral which cannot come off. If difficulty is experienced in placing a neat numeral on the crucible it may be outlined in dots, which gives a very pretty effect This simple method furnishes a reagent which is always a t hand and one that is inexpensive, quick to apply and permanent. After three years’ use, marks made in this way shon. up as bright as when they were taken out oi the flame. Very respectfully, CLAUDED. Masos.
DEPARTMENT O F INDUSTRIAL RESEARCH, UNIVERSITY OF PITTSBURGH.
THE ESTIMATION OF OXYGEN AND OCCLUDED GASES IN COPPER, ETC.-AUTHOR’S NOTE. The methods of analysis given in my article under the above title (THISJOURNAL, 4, 402), may be simplified by the following: I n the purification of Carbon Dioxide (p. 403), for tube ( A ) , substitute: “A bulb tube of CrO, H,SO, (sp. gr. 1.84) heated by I foot of resistance wire wound over asbestos; then omit (D), the tube of dry chromous chloride.” In the purification of hydrogen (p. 403), for A , B and C, substitute the heated bulb tube of CrO, + H,SO, described above. If it is not convenient to use resistance wire for heating these bulbs, a lamp will answer the purpose. GEORGEL. HEATH.
+
HUBBELL, hIICH.
CHEMICAL INDUSTRIES OF NORWAY. B y COSSUL THOMAS H. &-ORTON.
IDAHO STATE BOARD O F HEALTH,
BOISE,August 12, 1912.
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THE NEED OF CHEMICAL CONTROL IN FURNACE OPERATION. During t h e past year I have visited several hundred power plants in this section of the country and as a chemist have been particularly impressed with the lack of instruments for determining furnace efficiency, i. e . , automatic CO, recorders and continuous gas samplers for sampling flue gas over a period of a number of hours; even the familiar Orsat apparatus is notable by its absence. Furthermore, in 90 per cent. of the cases, in the few plants where something of the kind was found, the instruments had been consigned to the scrap heap or stored and were never used. The reason seems t o lie in the thought that with coal a t $ 1 . 5 0 per ton the possible saving would not be worth while. But i t has been conclusively proved t h a t the use of these instruments will result, even in this lom-priced fuel district, in saving both the cost of instruments and of operation many times over. The losses which take place in furnaces are the most glaring of modern plant operation, yet they receive the least attention. To the chemists the cause for this is not far to seek. Combustion is essentially a chemical process and i t is easier for him t o comprehend the chances for loss than one not thoroughly versed in the science. Still more important is the fact t h a t
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Numerous factors have combined t o retard the industrial progress of Norway. The climate is severe, coal is lacking, the mineral deposits are not easily accessible, the area of tillable land is very limited, and the industrial education of the people is not advanced. Less than 3 per cent. of the land is under cultivation, about 25 per cent. is covered by forests, and the reminder consists essentially of moors, mountain pastures, lakes, and marshes. The conditions of life have been comparatively hard and emigration extensive. Exports t o other countries have been limited chiefly t o timber and the products of the extensive fisheries. There is, however, now a marked change for the better. h’orway bids fair t o develop into a n industrial state of considerable importance, and the chemical industries are the ones coming most prominently to the fore in the movement. The first step forward was taken in the development of the wood-pulp industry. The ,second, and most important for ATorway’s future, was the utilization of the country’s magnificent water power for t h e establishment of electrotechnical and, more especially, of electrochemical industries on a scale impossible in any other European land. The general movement forward in the manufacturing industries of the Kingdom, and more specifically in the various branches of applied chemistry, may be measured by the growth during t h e decade 1897-1908. It should be stated, in this connection, however, t h a t a very noticeable increase in the establishment of new factories, mills, etc., began in 1890. It reached its maximum in 1899. There was a decline in the rate until 1904, when a new period of activity set in, and has continued uninterruptedly until the present time.
