The article Divers tells you: 210 feet.
In baseball, how is a fielding-record calculated?
To get the fielder’s average, you divide the number of chances he has made the most of by the total number of chances he has had. (Vol. 3, p. 461.)
How tall must a giant be?
Seven feet, to be properly called a giant. (Vol. 18, p. 741).
Where were the first lighthouses built?
In lower Egypt, as stated in the article Lighthouse, which describes all the great lighthouses and gives pictures of the towers and of the wonderful lamps.
When ships are going through the Panama Canal, from the Atlantic to the Pacific, will they be heading to the eastward or to the westward?
Oddly enough, to the eastward; for the Isthmus curves so, just where the canal line lies, that the Pacific end is much to the eastward of the Atlantic end. You can see this plainly on the detailed map in the article Panama Canal.
Why does a tame rabbit die if it is held erect for half an hour?