Mechanics: hand crank; vertical crankshaft; oscillating wing pump; conical valve; spur gear and lantern; worm and worm gear; crank and connecting rod; flywheel.

Mechanics: hand crank; interrupted lantern and racks; chain equalizer; roller guides.

Mechanics: horizontal waterwheel; spur gear and lantern.

Mechanics: horizontal submerged waterwheel; oscillating wing pump; conical valve; double interrupted crown gears and lantern gear; double worm and reversing racks; roller guides.

Mechanics: hand crank; machine crank; lift pump; flap valve; horizontal working beam; flywheel.

This is the only image showing a woman as the prime mover of a machine.

Mechanics: hand crank; force pump; conical valve; interrupted crown gear and lanterns; double worm and reversing racks; roller guides.

Mechanics: undershot waterwheel; lift pump; double interrupted crown gears and lantern gear; double worm and reversing racks; horizontal working beam; roller guides.

Mechanics: undershot waterwheel; machine crank; bell crank; roller guides.

Advertisement about using various models of Beckman pH meters for monitoring water quality in industrial settings.

Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California…

The Beckman Water Quality System incorporates Hach Company instruments.