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  2. Mainspring gauge - Wikipedia

    en.wikipedia.org/wiki/Mainspring_gauge

    Each manufacturer used a different arbitrary scale to describe mainspring sizes, but these sizes are usually based on the French inch. Figure 2: Martin mainspring slit gauge. Actual size 87 x 17 mm. A better method for measuring strength is to use a slit gauge, Figure 2, with which the thickness of the mainspring is measured directly.

  3. Garage door - Wikipedia

    en.wikipedia.org/wiki/Garage_door

    Sectional garage door Up-and-over garage door Garage Door Hardware. A garage door is a large door to allow egress for a garage that opens either manually or by an electric motor (a garage door opener). Garage doors are frequently large enough to accommodate automobiles and other vehicles. The operating mechanism is usually spring-loaded or ...

  4. Spring scale - Wikipedia

    en.wikipedia.org/wiki/Spring_scale

    Spring balances come in different sizes. Generally, small scales that measure newtons will have a less firm spring (one with a smaller spring constant) than larger ones that measure tens, hundreds or thousands of newtons or even more depending on the scale of newtons used. The largest spring scale ranged in measurement from 5000 to 8000 newtons.

  5. Torsion spring - Wikipedia

    en.wikipedia.org/wiki/Torsion_spring

    The balance wheel and spring function similarly to the torsion pendulum above in keeping time for the watch. The D'Arsonval movement used in mechanical pointer-type meters to measure electric current is a type of torsion balance (see below). A coil of wire attached to the pointer twists in a magnetic field against the resistance of a torsion ...

  6. Spring (device) - Wikipedia

    en.wikipedia.org/wiki/Spring_(device)

    A flat spring fixed only at one end like a cantilever, while the free-hanging end takes the load. Coil spring Also known as a helical spring. A spring (made by winding a wire around a cylinder) is of two types: Tension or extension springs are designed to become longer under load. Their turns (loops) are normally touching in the unloaded ...

  7. American Measurement Standard - Wikipedia

    en.wikipedia.org/wiki/American_Measurement_Standard

    The American Measurement Standard. ISBN 978-0-578-00244-6. Size Matters-Residential Square Footage. ISBN 978-1500866075 and; How to Measure a House. ISBN 978-1456491987. Realtor Magazine. "In Search of A Standard." September 2008. Approved for use by the Mississippi Appraisal Board. January 2019.

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