78 BEPORT OF NATIONAL MUSEUM, 1915. 



facture and uses of the artificial abrasives crystolon and aliindum. 

 From the Pittsburgh Crushed Steel Co., a series of crushed steel 

 products employed for abrading purposes. From the American 

 Tripoli Co., of Seneca, Mo,, examples of tripoli and tripoli products. 



A very remarkable specimen of asbestos rock, weighing 550 pounds 

 and showing the typical vein occurrence of asbestos fibre, forms part 

 of a series which includes the several grades of carded asbestos fibre, 

 presented by the Asbestos Corporation of Canada, Ltd., Montreal, 

 Canada. Two other donations in this line consist of asbestos prod- 

 ucts from the Sail Mountain Co., of Chicago, 111. ; and of the same, 

 with illustrations of the steps in the process of their manufacture, 

 from the Asbestos Protected Metal Co., of Beaver Falls, Pa. 



Among the additions to the coal series was a very complete set of 

 photographs representing actual scenes in and around the by-product 

 coke j)lant of the United States Steel Corporation's works at Gary, 

 Ind., drawings of which had been used for a model of such a plant 

 installed the previous year. A further contribution consisted of a 

 series of specimens of the many by-products derived in coking 1/10 

 of a ton of coal, showing the exact amount of each obtained, which 

 was presented by the Semet-Solvay Co., of Syracuse, N. Y. These 

 several exhibits, which are grouped together, imx)art to the Museum 

 visitor, in a very clear and concise manner, a knowledge of one of 

 the most important industries of the world. 



The division is attempting an industrial classification of the coals 

 of the world, and has thus far met with excellent results through 

 cooperation with the many coal mining companies in the United 

 States whose products are of distinct types. Each company so far 

 approached has presented a sample block of its coal, together with a 

 description of the same, giving its analysis, uses and markets, which 

 is used as the basis of a descriptive label containing information 

 valuable to the public. 



A very complete series representing the manufacture of graphite 

 and its industrial products, the gift of the International-Acheson 

 Graphite Co., of Niagara Falls, N. Y., by reason of its compact ar- 

 rangement and comprehensiveness, has been selected as the standard 

 for one of the four types of exhibition methods to be followed by the 

 division. Another exhibit of graphite, designed to demonstrate the 

 native occurrence of this mineral, its mining, treatment, and uses, 

 including the process of manufacturing lead pencils, was nearly 

 ready for installation at the close of the year. Its preparation was 

 undertaken in cooperation with the Joseph Dixon Crucible Co., of 

 Jersey City, under the direction of Mr. Malcohn McNaughton. 



A systematic exhibit, which will summarize current knowledge 

 regarding the use of asphalt, at present under construction as a gift 

 by the Barber Asphalt Paving Co., of Philadelphia, Pa., will repro- 



