1851 Great Exhibition: Official Catalogue: Class X.: H. Mapple
126 MAPPLE, H., Child's Hill, Hampstead — Inventor.
Machine for saving life on railways, now used in America.
Fire alarum, on the principle of the telegraphic alarum now used on the English lines.
Resonant spring for English clocks.
Compensation pendulum.
Supporting telegraph wires on tripods of iron rods.
Improved clock escapement; system of railway signals; and mariners' compass needle.
Electric telegraph.
Specimen of insulated wire for telegraphic purposes.
Compensation for pianoforte strings.
Improved system of collecting lamp black; and of making permanent magnets.
Improvements in electric timekeepers.
Implement for shoemakers.
Model to illustrate a theory for crossing any expanse of water by electric currents, for telegraphic purposes.