124 THE UNIVERSE 



metallic rods, which are stuck into the earth in any 

 desired position. When the receiver is silent or 

 gives only faint sounds, it indicates that the lines 

 of force are deflected from their normal course. 

 This reveals the presence of metallic masses in the 

 earth, and, by moving the electrodes about, the 

 position and area of an ore deposit may be deter- 

 mined with considerable accuracy. In new and un- 

 known ground the operator would place his dis- 

 tributing electrodes about 200 yards apart, and 

 remove his receiving instrument to a distance of 

 half a mile or more. If his general knowledge of 

 geological formation led him to believe that the 

 metallic veins, if there were any, would run gener- 

 ally north and south, he would place his electrodes 

 east and west, and if he found the electrical dis- 

 tribution normal he might conclude that the ground 

 contained no mineral. 



This remarkable electrical system for detecting 

 the mineral deposits beneath the surface of the 

 earth will doubtless be tested and perfected until 

 man will be able without digging into the earth 

 to ascertain the mineral deposits at any point be- 

 neath its surface. It may not always determine if 

 they may be profitably worked, but in many min- 

 ing regions it will be a blessing, and save much un- 

 profitable work and sad disappointment. 



Electrically heated cooking and laundry appa- 

 ratus is now used in Germany and other countries. 

 And there are farms on large German estates 

 which are run by electricity. The Guednau farm in 

 Eastern Prussia consists of 450 acres, and its dairy 

 handles one thousand gallons of milk daily. It 

 is lighted by electricity, has an electrical churn 



