46 
Relief maps of the Chattanooga District, one showing topo- 
•graphical, the other geological features. Note how, by folding 
and erosion, the formations originally overlying one another 
have been exposed so as to succeed one another laterally. 
^ Relief map of Massachusetts, from maps of the United 
States Geological Survey and the Topographic Survey of Massa- 
chusetts. Horizontal scale, 1 inch equals 4 miles. Vertical scale, 
1 inch equals 4,000 feet 
Relief map of Connecticut from maps of the United States 
Geological Survey and the Topographic Survey of Connecticut. 
Relief map of the Caucasus Mountains. 
Relief map of the World on Mercator’s Projection. Hori-' 
zontal* scale, 630 miles to 1 inch. Vertical scale, 78 times the 
horizontal. 
Relief map of Palestine. Horizontal scale, 1 inch equals 
6 miles. Vertical scale, exaggerated 5 times. 
A terrestrial globe four feet in diameter. 
There is also exhibited in this hall, “a model on a large 
scale of the Chandler iron mine, Ely, Minnesota. It illustrates 
how the underground workings of a large mine are car- 
ried on. Two shafts (shown at the rear of the model) run from 
the surface downward. At levels 60 feet apart, horizontal gal- 
leries run from the shaft and connect at intervals with other 
passages. Figures of miners at work may be seen by looking 
through these cross- ways from the ends of the model. From 
the two main galleries, sloping ways, not shown in the model, 
lead upward to passages at higher levels which do not connect 
with the shaft. Here as the ore is excavated it is thrown 
through chutes to the tramways of the main galleries, and there 
taken by ore cars to the shafts and raised to the surface. The 
timbering is to prevent the top and sides from caving. 
Upon the wall is a large painting representing a section of 
the Soudan Mine of Tower, Minn. 
HALL 77. 
Passing into Hall 77, and turning to the right, maps will be 
found against the wall in the following order: 
Geological relief map of the Island of Teneriffe. 
