汶川地震短句

2025汶川地震短句(精选15句)。

◳  But when table, penholder and paper are all moving, how is it possible to write legibly?

◳  Some devices were quite simple.

◳  It was necessary, therefore, to invent instruments that neither slumbered nor slept.

◳  Instruments have been devised and can be so placed that all three elements can be recorded in different graphs.

◳  The second marks the arrival of transverse vibrations which travel more slowly and arrive several minutes after the first.

◳  An earthquake comes like a thief in the night, without warning.

◳  It is because his feet move on, but his head stays still.

◳  The ideal to be aimed at was to devise an instrument that could record with a pen on paper, the movements of the ground or of the table as the quake passed by.

◳  it would be more like that of a bluebottle buzzing round the room;

◳  but while the drum was being shaken, the line that the pen was drawing wriggled from side to side.

◳  Why does a person standing in a bus or train tend to fall when a sudden start is made?

◳  These two have travelled through the earth.

◳  It will be found that the weight moves but slightly or not at all.

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◳  If it were gentle, only the more unstable rods fell.

◳  Imagine an earthquake shock shaking the floor, the paper, you and your hand.

◳  When a shock came, it shook the rigid table upon which these stood.

◳  The key to a solution of that problem lay in an everyday observation.

◳  In the midst of all this movement, the weight and the pen would be still.

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