are fastened to a cage B pro- forward. The reflector G serves similarly to collect the front for the escape of heat. The walls of the re- vided with a strap F, which is strapped about the and reflect the sound waves that pass upward. For head of the wearer. As an additional support to the… … places where there is more or less noise. The device RESONATOR FOR TELEPHONES. is particularly adapted for use in shops, pumping sta- A PORTABLE LIGHT FOR CAMPERS. tions, and the like, where ordinary sounds are not extends to the main body is tangent thereto and flat- discernible, especially under…
Patents · Device · Apparatus · Molds · Concrete · Scientific American · Automobile · Thirty feet · Ten feet · American supplement · Wireless telegraph · York city · Automobile wireless · Long island · Reinforced concrete · Steering column
Internet Archive · Public domain (published before 1931). Free to use for anything.
