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2 answers

Early in the 1900's (circa 1917) precision curved glass tubes filled with a damping liquid and steel ball were introduced to provide accurate visual angle indication.

2006-11-17 15:53:50 · answer #1 · answered by Anonymous · 0 0

Hi. I would guess a container of water.

2006-11-17 21:59:50 · answer #2 · answered by Cirric 7 · 0 0

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