The following passage is quoted from a letter. It is the practice of carpenters hereabouts, when laying out and leveling up the foundations of relatively long buildings, to use a garden hose filled with water, with glass tubes 10 to 12 inches long thrust into the ends of the hose. The theory is that water, seeking a common level, will be the same height in both the tubes and thus effect a level. Now the question rises as to what happens if a bubble of air is left in the hose. Our greybeards contend the air will not affect the reading from one end to the other. Others say that it will cause important inaccuracies. Can you give a relatively simple solution to this problem, together with an explanation? Figure 14.48 gives a rough sketch of the situation that caused the dispute.

Transcribed Image Text:

Air bubble trapped in hose Obstruction not above level of water in tubes Giass tube -Water level