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Keywords:
PNEUMATIC,
TRANSMISSION,
TELEGRAPHY,
TELEGRAPHS,
VACUUM,
COMPRESSED,
AIR,
TUBES,
VALVES,
SLUICES,
WORKING,
IRON,
LEAD,
SIGNALLING,
LAYING,
ENGINES,
THEORY,
FRICTION,
WORK,
SPEED,
EXPANSION,
PRESSURE,
MEASUREMENT,
TEMPERATURE,
LEAKAGE,
INTERMITTENT,
CONTINUOUS,
SIGNALS,
CARRIERS,
BLOCKAGES,
OBSTRUCTIONS,
CLEARING,
EXPERIMENTS,
MANOMETERS,
TIME,
COMMUNICATIONS,
TELECOMMUNICATIONS,
LONDON,
UK
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© Thomas Telford and ICE
1876
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