V. MAPS, ETC. 81 3 



3232a. Specimens of Charts published by the Navy 

 Department. 



General Direction of the Depot of Marine Charts and 



Plans, Paris. 

 Cherbourg Roads, 1836. 

 Directions of currents in the Channel, 1855. 

 Coasts of the mouths of the Rhdne, 1848. 

 Coasts of Italy, 1863. 

 Approaches to Brest, 1868. 

 Island of Ouessant, 1868. 

 Guadaloupe, 1874. 

 Japan, 1874. 



3235. Collection of Maps and Flans. 



M. Biard, Paris, 



3236a. Collection of Maps, Plans, Piaster Casts, and 

 Photographs. M. Delagrave, Paris. 



3236b. Map of Travel, setting off by differently coloured 

 tracings the relative antiquity and importance of the Roman 

 roads. M. Hayaux du Tilly, Paris. 



3237. Manuscript Map of British Isles, on rollers. 



Wichmann, Hamburg. 



323S. Collection of Models and Maps. 



Frere Alexis, Gochet. 



3239. Diagrams showing the amount of the Misrepresenta- 

 tion of the Sphere by plane maps in the most usual projections. 



C. W. Merri/ield, F.R.S. 



3240. Lecture Diagrams (4) of Alpine Glaciers, of 



Switzerland, by the late G. V. du Noyer. Used in illustration 

 of lectures at the Royal College of Science, Dublin. 



Edward Hull, F.R.S. 



3241. Working Model of a Geyser. 



Prof. W. F. Barrett. 



This is a lecture table arrangement constructed upon the method first 

 suggested by Prof. Wiedemann, and illustrated on a large scale by Prof. 

 Tyndall. Water is put into the tube and heated by a gas flame below. 

 Under the pressure of the column of water, the boiling point is raised, and 

 the pressure being lessened by the overflow of water into the basin, steam 

 is suddenly generated, which ejects the water periodically to a consider- 

 able height. When the tube is cooled, the eruption from this small model 

 can eject the water at least 20 feet high. A large form, on the same pattern, 

 similarly ejects the water 30 or 40 feet high. The size of the larger model is 

 as follows: Tube of galvanised iron, 7 feet long, 4 inches in diameter below, 

 and 2 inches diameter above. Basin, say 4 feet in diameter. A spiral row 

 of gas jets heats this larger tube one-third of the way up, as well as a large 

 gas flame below. 



3242. " Cadre-Mobile, 5 ' Frame for wall maps and pictures 

 used in schools. Ernest Recordon ( Geneva)* 



