Inside Out Library · Explore

Scientific American, Vol. 89, No. 25 (December 1903) (1903)

leaf 11

An illustration from Scientific American, Vol. 89, No. 25 (December 1903), 1903, leaf 11
ery profitably applied to improve the herewith. The improved shade has approximately is firmly held between a shoulder on the mouthpiece telephone. At that time I was engaged in commercial the form of a pair of spectacles, being held to the and the receiver proper. Hmged to the upper pro- pursuits… … States, and its validity be as open and undetermined a vention the voice had to vibrate a diaphragm against EYE SHADE. question as it was prior to the bringing of the first suit a magnet, and the volume of electricity thus produced upon it. It is only by a combination of very unusual was not…

Patents · Device · Apparatus · Machine · Object · Scientific American · Inches · Great western · Gas engine · White lead · White star · East river · Sea water · Years ago · Water vapor · Entrance fee

Internet Archive · Public domain (published before 1931). Free to use for anything.

More pictures from Scientific American, Vol. 89, No. 25 (December 1903)

More like this