Chapter IV: ELECTRICITY. ETC.--Telephony and Telegraphy on the Same

Wires Simultaneously.--4 figures. 7067

The Electric Marigraph.--An apparatus for measuring the
height of the tide.--With engravings and diagrams showing
the Siemens and Halske marigraph and the operation of the
same. 7068

Delune & Co.'s System of Laying Underground Cables.--2
figures. 7069

Electricity Applied to Horseshoeing.--Quieting an unruly
animal.--3 engravings. 7069

Esteve's Automatic Pile.--1 figure. 7070

Woodward's Diffusion Motor. 7070