m_ag_us: (МалевичЪ)
LuTsi ([personal profile] m_ag_us) wrote2013-06-15 08:20 pm
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Точные науки.


Под стеклом, в левой верхней четверти квадрата расположен микрометр, намертво присоединённый к сторонам вертикальной трещины в скале.
Фиксирует неизменность расстояния между.
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