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  2. Johnson's parabolic formula - Wikipedia

    en.wikipedia.org/wiki/Johnson's_parabolic_formula

    Graph of Johnson's parabola (plotted in red) against Euler's formula, with the transition point indicated. The area above the curve indicates failure. The Johnson parabola creates a new region of failure. In structural engineering, Johnson's parabolic formula is an empirically based equation for calculating the critical buckling stress of a column.

  3. Euler's critical load - Wikipedia

    en.wikipedia.org/wiki/Euler's_critical_load

    This formula was derived in 1744 by the Swiss mathematician Leonhard Euler. [2] The column will remain straight for loads less than the critical load. The critical load is the greatest load that will not cause lateral deflection (buckling). For loads greater than the critical load, the column will deflect laterally.

  4. Rupture disc - Wikipedia

    en.wikipedia.org/wiki/Rupture_disc

    A rupture disc is a type of sacrificial part because it has a one-time-use membrane that fails at a predetermined differential pressure, either positive or vacuum and at a coincident temperature. The membrane is usually made out of metal, [1] but nearly any material (or different materials in layers) can be used to suit a particular application ...

  5. Flip clock - Wikipedia

    en.wikipedia.org/wiki/Flip_clock

    A flip clock (also known as a "flap clock") is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split-flap display. The study, collection and repair of flip clocks is termed horopalettology (from horology – the study and measurement of time and palette – and the Italian ...

  6. Casio F-91W - Wikipedia

    en.wikipedia.org/wiki/Casio_F-91W

    The lower left button, labeled "Mode", cycles the modes of the watch: time display, alarm, stopwatch, and time/date adjustment. The right button, labeled "Alarm On-Off/24hr", is the function button: when used, it starts and stops the stopwatch, changes the settings currently being adjusted, or switches between the 12- and 24-hour modes ...

  7. Lever escapement - Wikipedia

    en.wikipedia.org/wiki/Lever_escapement

    A typical watch lever escapement beats at 18,000 or more beats per hour. Each beat gives the balance wheel an impulse, so there are two impulses per cycle. Despite being locked at rest most of the time, the escape wheel rotates typically at an average of 10 rpm or more. The origin of the "tick tock" sound is caused by this escapement mechanism.

  8. Clock drift - Wikipedia

    en.wikipedia.org/wiki/Clock_drift

    There are several similar ways clock drift can be used to build random number generators (RNGs). One way to build a hardware random number generator is to use two independent clock crystals, one that for instance ticks 100 times per second and one that ticks 1 million times per second. On average the faster crystal will then tick 10,000 times ...

  9. Photo-lab timer - Wikipedia

    en.wikipedia.org/wiki/Photo-lab_timer

    Early photolab timers used a clockwork mechanism to measure time. Manual timers are usually set by turning a dial to the desired time interval, storing energy in a mainspring that operates the mechanism. They work in a way similar to a mechanical alarm clock, the energy of the mainspring causing a balance wheel to oscillate back and forth.