KEPOET OF NATIONAL MUSEUM, 1915, 77 



the two standard types of furnace in current use were contributed in 

 1914. The additions during Last year comprised models of a glass 

 annealing furnace, a glass-melting clay pot, and the various tools 

 used by glass blowers, together with many specimens designed to 

 illustrate the art of glass making, including segments of the glass 

 rings used in the construction of lighthouse lenses, a series of colored 

 railroad lantern globes and bull's eyes for both hand lanterns and 

 signals, and many styles of electric and gas lamp shades employed 

 in both direct and indirect lighting effects. This entire exhibit has 

 been made expressly for and is a generous donation to the Museum 

 by the Macbeth-Evans Co., through the friendly offices of its presi- 

 dent. There is but little more required to render it complete. 



As the central theme of an exhibit designed to acquaint the public 

 with a widely used but as yet little laiown building material, a model 

 has been constructed by the Museum, on a scale of 1 in' 48, of the gyp- 

 sum plant of the United States Gypsum Co., of Chicago, 111., located 

 at Oakfield, N. Y. It is based upon drawings from the company, 

 and, while showing the underground conditions in the mine and the 

 methods of ore extraction, its most significant feature is the clear 

 comprehension it imparts of the manufacturing process employed by 

 one of the largest, if not the largest, gypsum manufacturing com- 

 panies in the country. All machines and appliances of importance 

 are represented in their relative positions in the buildings of the 

 plant, so that the visitor, by walking around the model, may obtain 

 a full understanding of the methods. 



A series of specimens of crude mica and its products, with illus- 

 trations of the manufacture of mica plate, a process by which mica 

 that was formerly thrown away as waste can be utilized, was con- 

 tributed b}^ the Keene Mica Products Co., of Keene, N. H. This 

 accession, in connection with that received the previous year from 

 the Westinghouse Electric Manufacturing Co., constitutes an indus- 

 trial exhibit summarizing the occurrence, technology and uses of 

 mica. 



To the collection designed to show the occurrence, derivation and 

 adaptability of the known abrading materials, both natural and arti- 

 ficial, there were 5 accessions, all gifts, as follows: From the Pike 

 Manufacturing Co., of Pike, N. H., a series of photogi\aphs and 

 specimens illustrating the mining and treatment of the well known 

 Arkansas novaculite sandstone used for whetstones, and of the New 

 England mica schists employed for scythestones, etc. From the 

 Carborimdum Co., of Niagara Falls, N. Y., a model of a carborun- 

 dum electric furnace, together with a set of specimens, showing the 

 process of manufacturing the artificial abrasives carborundum and 

 aloxite, and their industrial uses. From the Norton Co., of Wor- 

 cester, Mass., photographs and specimens representing the manu- 



