55 



170. Model of Jerusalem, geologically coloured. 

 Size, 23 in. by 23 in., in glazed frame ; scale -YQ-^Q^ 

 or about 6^ inches to the mile. Constructed under the 

 direction of Col. Sir H. James, R.E. 



E. 3. 1869. 



This is constructed from the contoured maps of the Ordnance 

 Survejr, the contours representing intervals of 25 ft. There are 

 four geological colours, viz., pink, for pink and white chalk ; 

 white, for soft white chalk ; brown, for hard siliceous chalk ; and 

 blue, for nummulitic limestone. 



171. A representation of Columnar Basaltic Rocks. 

 Size, 14 in. by 11-g- in., and 6 in. high. Under glass shade. 



E. 314. 1877. Published by 0. Delagrave, Paris. 



This model, which is entirely in white, shows a long hill with 

 vertical sides in those parts which are formed by the basaltic 

 columns, Below these parts are the screes of broken basalt, and 

 elsewhere is represented the smoothness of the overgrowing 

 turf. 



172. Drawing and model, representing mountain 

 chains. 



To show the method of preparing relief models. From 

 the Upper Practical School, Schottenfelde, Vienna. 

 E. 131. 1862. Presented by the Austrian Government. 



This consists of a map on one side, and the corresponding 

 model on the other, both mounted in one oak frame, 23 in. by 

 10 in. The map represents the neighbourhood of the mountain 

 Orteles, but the heights in this are not indicated by contours, 

 but by shading. The relief model is, however, made by placing 

 contour cards one over the other. The surface is not coloured 

 geologically, but according to the agricultural character of the 

 surface, such as rocky, peat, pasture land, &c. 



173. Contoured model of the British Isles, including the 

 submarine plateau and surrounding area. Size, 4 ft. by 

 4 ft. Horizontal scale T3"2inro o> or a ^ u ^ 24 miles to the 

 inch ; vertical scale -^tro "o or &000 ft. to the inch, being 

 about 16 times the horizontal scale. 



E. 190. 1888. Constructed by Jas. B. Jordan. 



The surface of this model is left unaltered after the fixing of 

 the contour cards, in order that the method of construction may 

 be seen. Since the contours represent intervals of 250 ft. on 

 the land, no surface feature which occupies less than that 

 interval is depicted, and thus the hills all appear flat on the top, 



