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How it Works by Archibald Williams

4 by Archibald Williams, Williams, Archibald, 1871-1934

Chapter 7: Chapter VI.--THE ELECTRIC TELEGRAPH.

Chapters

Chapter 1 Chapter 1
Chapter 2 Chapter I.--THE STEAM-ENGINE.
Chapter 3 Chapter II.--THE CONVERSION OF HEAT ENERGY
Chapter 4 Chapter III.--THE STEAM TURBINE.
Chapter 5 Chapter IV.--THE INTERNAL-COMBUSTION ENGINE.
Chapter 6 Chapter V.--ELECTRICAL APPARATUS.
Chapter 7 Chapter VI.--THE ELECTRIC TELEGRAPH.
Chapter 8 Chapter VII.--WIRELESS TELEGRAPHY.
Chapter 9 Chapter VIII.--THE TELEPHONE.
Chapter 10 Chapter IX.--DYNAMOS AND ELECTRIC MOTORS.
Chapter 11 Chapter X.--RAILWAY BRAKES.
Chapter 12 Chapter XI.--RAILWAY SIGNALLING.
Chapter 13 Chapter XII.--OPTICS.
Chapter 14 Chapter XIII.--THE MICROSCOPE, THE TELESCOPE,
Chapter 15 Chapter XIV.--SOUND AND MUSICAL INSTRUMENTS.
Chapter 16 Chapter XV.--WIND INSTRUMENTS.
Chapter 17 Chapter XVI.--TALKING-MACHINES.
Chapter 18 Chapter XVII.--WHY THE WIND BLOWS.
Chapter 19 Chapter XVIII.--HYDRAULIC MACHINERY.
Chapter 20 Chapter XIX.--HEATING AND LIGHTING.
Chapter 21 Chapter XX.--VARIOUS MECHANISMS.
Chapter 22 Chapter I.
Chapter 23 Chapter II.
Chapter 24 Chapter III.
Chapter 25 Chapter IV.
Chapter 26 Chapter V.
Chapter 27 Chapter VI.
Chapter 28 Chapter VII.
Chapter 29 Chapter VIII.
Chapter 30 Chapter IX.
Chapter 31 Chapter X.
Chapter 32 Chapter XI.
Chapter 33 Chapter XII.
Chapter 34 112. A _compound_ lens is needed, made up of a _crown_ glass convex
Chapter 35 Chapter XIII.
Chapter 36 131. Two rays, A _b_, A _c_, from a point A strike the mirror M at the
Chapter 37 Chapter XIV.
Chapter 38 Chapter XV.
Chapter 39 138. (2.) _Reed_ pipes--that is, pipes used in combination with a
Chapter 40 Chapter XVI.
Chapter 41 Chapter XVII.
Chapter 42 Chapter XVIII.
Chapter 43 176. The piston now is solid, and the upper valve is situated in the
Chapter 44 Chapter XIX.
Chapter 45 Chapter XX.

Chapter 7: Chapter VI.--THE ELECTRIC TELEGRAPH.

Needle instruments--Influence of current on the magnetic needle--Method of reversing the current--Sounding instruments--Telegraphic relays--Recording telegraphs--High-speed telegraphy 127

17 words

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