A stress line below the ground surface which connects all the points at which vertical stress is equal is called an isobar. it is a curved surface which resembles as bulb , due to the vertical pressure at all the points below the ground surface in the horizontal plane
IMPORTANCE:
*there are used to deter mine the effect of load on vertical stress at different points .
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He made it out of carbonized paper filaments in an evacuated glass bulb.
the light bulb was invented in 1779.
The Light Bulb
It gave us light
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