electric visions:
spirit photo - from perfect medium - Albert von Schrenck-Notzing 1912
electric visions:
007 -wiedemann 1883 from darrigol
electric visions:
006 - s&m (I) 1879 - pl 18 inverted bw round tube
electric visions:
002 -dlr & m IV - crossedtubes, pl 35
electric visions:
00 CROP - dlr & m IV, tubes pl 35
electric visions:
00 CROP2 - dlr & m IV, tubes pl 35
electric visions:
020 - dlr and m, 1878a II 181 fig 46 - straie drawngs
electric visions:
014 - s&m I artificial striae, pl 16, fig 9