1. Top Center: “Trough” battery cell2. Top Right: “Column” battery cell3. Central Figure: “Pneumatic machine”
The glass bell on this contraption is known as the the “passive component” of this pneumatic circuit. Where an automatic gas compressor would be found today (the set of chambers and cranks to the right), is a manual gas compressor, vacuum chamber, and pressure gauge. 
Steam age physics demonstrators are too cool-looking to not want to play with.
Dictionnaire universel d’histoire naturelle. Charles Dessalines d’Orbigny, 1837.

1. Top Center: “Trough” battery cell
2. Top Right: “Column” battery cell
3. Central Figure: “Pneumatic machine”

The glass bell on this contraption is known as the the “passive component” of this pneumatic circuit. Where an automatic gas compressor would be found today (the set of chambers and cranks to the right), is a manual gas compressor, vacuum chamber, and pressure gauge.

Steam age physics demonstrators are too cool-looking to not want to play with.

Dictionnaire universel d’histoire naturelle. Charles Dessalines d’Orbigny, 1837.

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