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Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914) Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 239
t extent. De Forest was perhaps the first experimenter to develop a completewireless telephone transmitting and receiving system, but previous-to thatA. F. Collins had worked out an arc telephone which permitted com*munication for some miles without wire connections. The Marconi Company has… … ©9 CO*m•« Vh O rG CU._ +> CO CO ill ,. boG q v „ « c a)G ^ 8 2 3 -s-h « O o w r °8 is§ <1> ~ C °.^ . • ±2 .G cB Vh OP O CO o h L o ?*> CO 8 bflG S^G ^o go CO oc- G Ocu CO •a S8 «h C3 O O^ * <D CU ctJ sort o Q. CO la *~»G M-r< & oh ° « G_Q <n ° cu_d o to g ^-Jif^S g^ G cp O… Electrical engineering
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