, M. Boulle de- name as that of the ends of the magnets touching the nently magnetized needle. The soft iron bar is freely scribes a form of dredger in which the removal of sand bar. suspended, and receives its magnetism from the fixed or silt is effected by an injection of compressed air in- m i ■… … streams of water may thus be illuminated throughout, diameter, and sand was dredged from a depth of 15 Fig. 2,-PEBMANENT MAGNET AND BAB MAGNETIZED eveu when thrown 4}£ or 5 meters from the cylinder or feet, lifted 5J£ feet above the water level, and finally BY INDUCTION. fountain, and a brilliant…
Patents · Contained · Scientific American · Apparatus · Iron bar · Express money · Electric light · Sewing machine · Soft iron · Milling machines · American supplement · Milling machine · Induction coil
Internet Archive · Public domain (published before 1931). Free to use for anything.
