Needle capacity apparatus
Newton's coloured rings
Newton's disk
Newton's tube
Nicholson's areometer
Nobili's galvanometer
Norrenberger's apparatus
Oersted's experiment
Optical bench for showing the teory of telescopes
Pacinotti's magneto-electric machine
Pacinotti's ring winding
Palmer's micrometer
Pellat's apparatus
Piezometer
Phosphorescent substances
Photocell
Plane angular mirrors and parallel mirrors
Pneumatic oil pump, Fleuss type
Pneumatic pump
Pneumatic tinderbox
Polyprism
Polyphase motors
Porro's telescope
Precision scales
Prismatic glass tanks
Psycrometer

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