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2. Surveyor's wheel - Wikipedia

   en.wikipedia.org/wiki/Surveyor's_wheel

   The trundle wheel is composed of a wheel, a handle which is attached to the axle allowing the trundle wheel to be held easily, and a clicking device which is triggered once per revolution of the wheel. Trundle wheels are not as accurate as other methods of measuring distance but are a good way to get a rough estimation of a fairly long distance ...

3. Accuracy and precision - Wikipedia

   en.wikipedia.org/wiki/Accuracy_and_precision

   Accuracy is also used as a statistical measure of how well a binary classification test correctly identifies or excludes a condition. That is, the accuracy is the proportion of correct predictions (both true positives and true negatives) among the total number of cases examined. [10] As such, it compares estimates of pre- and post-test probability.

4. Odometer - Wikipedia

   en.wikipedia.org/wiki/Odometer

   The vehicle wheel (li lun) is attached to the left road-wheel; it has a diameter of 1.38 ft with a circumference of 4.14 ft, and has 18 cogs (chhih) 2.3 inches apart. There is also a lower horizontal wheel (hsia phing lun), of diameter 4.14 ft and circumference 12.42 ft, with 54 cogs, the same distance apart as those on the vertical wheel (2.3 ...

5. Baggage sizer - Wikipedia

   en.wikipedia.org/wiki/Baggage_sizer

   A series of baggage sizers at Alicante airport.. A baggage sizer, also known as a bag sizer, is a piece of furniture that is used primarily at airport check-in desks and boarding gates to assist and inform passengers and airport ground staff of baggage size limits for personal and cabin luggage or bags.

6. Jones Counter - Wikipedia

   en.wikipedia.org/wiki/Jones_Counter

   Jones Counter on the front wheel of a bicycle. To measure road-race courses, the counter is fitted to a bicycle between the left fork leg and the front wheel. [5] The tab or tabs on the large ring gear engage with the spokes, thus providing drive to a Veeder-Root counter.

7. Gyroscope - Wikipedia

   en.wikipedia.org/wiki/Gyroscope

   Diagram of a gyro wheel. Reaction arrows about the output axis (blue) correspond to forces applied about the input axis (green), and vice versa. A gyroscope is an instrument, consisting of a wheel mounted into two or three gimbals providing pivoted supports, for allowing the wheel to rotate about a single axis. A set of three gimbals, one ...