Time is Money: Golden Age of TimekeepingThe terms AM and PM appeared first in Northern Europe, at the beginning of what would become a full-fledged industrial revolution. Farmers, long tuned to the natural timekeeping of the sun, abandoned their fields to find work in urban areas.
breaking stress. The stress required to fracture a material whether by compression, tension, or shear. breaking stress. The stress at which a component ruptures under a tensile force.
Mechanical stress is the root of a lot of the break-in phenomenon and it is not just a factor with cables. As a rule, companies set up audition rooms at high end audio shows a couple of days ahead of time to let them break in. The first day the sound is usually bad and it is very stressful. The last day sounds great.