The Museum of Science and Art, Vol. 3 (Classic Reprint)

Excerpt from The Museum of Science and Art, Vol. 3

Page current which arrives at a station. - 119. To make it ring the alarum. - 120. Station with two alarums. - 12l. Notice of the station transmitting and receiving signals - 122. When signals not addressed to the station the current is passed on. - 123. How to receive a despatch at the station, and stop its farther progress. - 124. How several despatches may be at the same time sent between various stations on the same line - 125. Secondary lines of wire then used - 126. Recapitulation.-127. Signals by com binations of unequal intervals of transmission and suspension. 128. Key commutator. - 129. Horological commutator for a current having equal and regular pulsations - 130. Case in which the pulsations are not continuous or regular. - 131. N 0 limit to the celerity of the pulsations - 132. Application of a toothed wheel to produce the pulsations - 133. By a sinuous wheel. 134. Method of diverting the current by a short circuit, its application to the alarum.-135. Effects of the current which has been used for signals - 136. Deflection of magnetic needle.

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