THE WORLD'S ADVANCE 



333 



the inhabitants of that spot have very 

 gladly accepted the service. 



There is at Crenelle, Paris, an artesian 

 well which provides a plentiful and con- 

 stant flow of water, the temperature of 

 which stands at something near 82 de- 

 grees F. This is a sufficiently high tem- 

 perature to enable the city to make the 

 wise and unusual use of the water above 

 mentioned. Therefore, instead of hav- 

 ing individual or municipal heating 

 plants from which steam or hot water 

 would be supplied to the various build- 

 ings or parts of the same building, the 

 hot-flowing well is used as a central heat- 

 ing plant. From it pipes are run over 

 the city, and the hot water so generously 

 provided by the earth is distributed 

 through them just as from the usual form 

 of heating plant. The result is so suffi- 

 ciently satisfactory that the custom bids 

 fair to remain. 



There are a number of artesian wells 

 in various parts of the earth which pro- 

 vide water running to as high a temper- 

 ature as eighty degrees. The tempera- 

 ture of the water supplied is apt to be 

 governed by the depth of the well, the 

 rule being that the deeper a well is bored 

 the higher will be the temperature of its 

 flow. The average temperature of the 

 water flowing from these wells is not 

 high, though it is considerably higher 

 than that of water obtained near the sur- 

 face. 



The name artesian really relates to 

 the depth of the well rather than to the 

 taste or mineral qualities of the water 

 obtained. The name artesian well was 

 originally adopted as meaning a deep 

 well. Therefore, it follows that there is 

 really no such thing as artesian water, 

 any kind of water being natural to an 

 artesian well just as to any other well 

 less deep. 



GERMAN CRANE AT PANAMA 

 CANAL 



The floating crane Hercules, of Ger- 

 man make, has recently been placed in 

 commission at the Panama Canal. The 

 Hercules has a lifting power of 300 tons. 

 Some idea can be gained of the enor- 

 mity of this crane by comparing its 



This Gigantic Crane of German Manufacture is Now 

 Being Used for Mounting Guns in the Canal Zone. 



size with that of the man standing on 

 the dock. 



The Hercules has been employed for 

 mounting guns at Toro Point forts and 

 raising machinery of various sorts which 

 sank during a storm within the east 

 breakwater at Coco Solo recently. 



AMERICAN SUBMARINES TO 

 UNDERTAKE LONG TRIP 



In order to test the endurance capa- 

 bilities of our submarines, it is announced 

 that during the month of September the 

 American submarines K-$, K-4, K-? and 

 /C-8 will be sent under their own power 

 from San Francisco to Honolulu. The 

 journey will exceed 2,200 miles, and it is 

 to be attempted without stops of any 

 kind. Although there will be a convoy 

 of submarine tenders accompanying the 

 under-water craft, these are only to give 

 aid in case of an emergency. 



