THE LOUISIANA PURCHASE EXPOSITION. 225 



The features which might be included in this class are as follows: 

 An elevated double track railroad, which surrounded our entire space, 

 and upon which there moved six miniature freight trains, each thirty- 

 two feet in length, and representing the important railroad systems of 

 Missouri, hauling the ores which occur in their respective territories. 

 This feature proved tremendously attractive. 



Second — A moving train of thirty cars loaded with various mineral 

 products of the State, circling in part, beneath the floor of our space an(/ 

 rising through an aperture about thirty feet in length to the level of the 

 floor, where they passed in endless chain before the spectator. 



Third — An automatic working model of a coal tipple, occupying a 

 floor space of twenty-two feet by seven feet, and illustrating the most 

 modern process of hoisting coal from the mines, dumping screening, 

 weighing and delivering the classified produce to freight cars. This 

 feature undoubtedly attracted and held the attention of more people than 

 did any other single exhibit in the entire department of Mines and Metal- 

 lurgy. 



Fourth — A working model of a zinc and lead mill, occupying a floor 

 space of twenty by twenty feet, and showing in every detail the methods 

 of handling our zinc and lead ores. This mill was operated by students 

 of the Missouri School of Mines. 



Fifth — A working chemical and assaying laboratory, operated by 

 the IMissouri School of Mines, and illustrating various chemical processes 

 which are used in connection with the treatment and testing of our ores. 



Sixth — A working magnetic separator, representing the process used 

 in Southwest Missouri of separating the objectionable iron pyrites or 

 mundic from the zinc ores of that district. 



Seventh — A moving collection of twelve hundred Missouri mining 

 views ; so arranged as to take up the least possible floor space, and at 

 the same time to present an imposing appearance as a collection, while 

 by pressing a button, the observer was enabled to stop the motion and 

 inspect in detail any particular view. 



Eighth — An operating rock section machine, together with optical 

 projection apparatus, from the School of Mines laboratories. 



In addition to the above features there should be mentioned the 

 exhibit, in the mining gluch, of an operating mining pump, which was 

 invented at the Missouri School of Mines, and which has attracted a 

 great deal of attention to that institution through its remarkable adapta- 

 tion to many water problems in mining. 



Two hundred framed bromide enlargments were also exhibited, while 

 a magnificent pavilion, built of Missouri's ornamental brick, terra cotta 



A— 13 



