Using a remote, you can control the strength and direction of the water stream with the precision of an angular-distance collimator on an artillery gun.

Collimation meaningin laser

These are hooked up to a collimator that they made out of a large cardboard tube with a hole at the end, which narrows the sound waves to a smaller area.

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Collimation meaningin surveying

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With the collimator, the coincidence rate drops by a factor of 10, but now exceeds the predicted accidental rate for both orientations.