A B C D E F G H I J K L M N O P Q R S T U V W Z

Cacciari, Milano, Italy
Mercury rotary pump

Campostano, Milano, Italy
Fluorescent screen of barium platinum cyanide

Carpentier, Paris, France
Legal Ohm
Sel-induction standard coil
Deprez-D’Arsonvalb reflection galvanometer
Optical lever Deprez-D’Arsonval galvanometer

Electrodyamic Ammeter

Electrodynamic Voltmeter

Amperometer

150 Volt full scale voltmeter

Ten Ampère full scale ammeter

100-Volt full scale voltmeter

Dessì, Cagliari, Italy
Brass to tip conductor

Tangent compass galvanometer

Dollond, London (England)
Kepler telescope

Donegani, Livorno (Italy)
Mercury termometer for bath

Duroni & Co Ottici, Milano, Italy
Recording barometer

Elliot F.lli, London, England
Thomson reflection galvanometer

Ernecke, Berlino - Tempelhof, Germany
Hughes Microphone

Polarized relay