The Museum of Science & Art

agent alarum apparatus appears armature atmosphere axis barometer battery Calais celerity of transmission centre cipher clock coil communication conducting wire connection continued corresponding Corsica deflection depth dial diameter direction disc dispatch distance double needle Dover earth earthquake effects electric current Electric Telegraph Company electro-magnet expedient explained feet fluid French telegraph galvanometer globe greater Guanaxuato gutta percha hand heat height Holyhead imparted inch indicating intensity intervals LARDNER'S MUSEUM length less letters lever line wire line-wire London magnet manner means mercury messages metallic miles moon motion moved MUSEUM OF SCIENCE necessary needle telegraph observed operation Ostend pass phenomena piston pole position produced projecting arm pulsations RAILWAY TELEGRAPH received rendered revolution ribbon of paper roller rotation Sardinia signals spring steam strata stratum submarine cable surface suspended telegraphic instruments TELEGRAPHIC LINES temperature terminal station tion transmitted tube undulations vapour vertical voltaic wheel words zinc