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2. Traveling microscope - Wikipedia

   en.wikipedia.org/wiki/Traveling_microscope

   Both vernier reading to 0.01mm or 0.02mm. Microscope tube consists of 10x Eyepice and 15mm or 50mm or 75mm objectives. The Microscope, with its rack and pinion attachment is mounted on a vertical slide, which too, runs with an attached vernier along the vertical scale. The microscope is free to rotate n vertical plane.

3. Rack and pinion - Wikipedia

   en.wikipedia.org/wiki/Rack_and_pinion

   A rack and pinion is a type of linear actuator that comprises a circular gear (the pinion) engaging a linear gear (the rack ). Together, they convert between rotational motion and linear motion. Rotating the pinion causes the rack to be driven in a line. Conversely, moving the rack linearly will cause the pinion to rotate.

4. Rack railway - Wikipedia

   en.wikipedia.org/wiki/Rack_railway

   Functioning of the rack and pinion on the Strub system. A rack railway (also rack-and-pinion railway, cog railway, or cogwheel railway) is a steep grade railway with a toothed rack rail, usually between the running rails. The trains are fitted with one or more cog wheels or pinions that mesh with this rack rail.

5. Science and inventions of Leonardo da Vinci - Wikipedia

   en.wikipedia.org/wiki/Science_and_inventions_of...

   Leonardo was a master of mechanical principles. He utilized leverage and cantilevering, pulleys, cranks, gears, including angle gears and rack and pinion gears; parallel linkage, lubrication systems and bearings. He understood the principles governing momentum, centripetal force, friction and the aerofoil and applied these to his inventions.

6. Pinion - Wikipedia

   en.wikipedia.org/wiki/Pinion

   the typically smaller gear in a gear drive train (although in the first commercially successful steam locomotive—the Salamanca —the pinion was rather large). [1] In many cases, such as remote controlled toys, the pinion is also the drive gear for a reduction in speed, since electric motors operate at higher speed and lower torque than ...

7. Magic lantern - Wikipedia

   en.wikipedia.org/wiki/Magic_lantern

   Magic lantern slide by Carpenter and Westley. The magic lantern, also known by its Latin name lanterna magica, was an early type of image projector that used pictures—paintings, prints, or photographs —on transparent plates (usually made of glass), one or more lenses, and a light source.