.250
Helium.
It Means You Have To: DO A BARREL ROLL!
While the original length is not indicated on the barrel, the barrel weight is. Example: 1Kg012 which would mean 1012 grams. An accurate scale would help you identify. If the barrel weighs less than the stamped number then the barrel has been altered.
Barrel is 21.5 inches long. The attached link is an article on them, with photos. Using a barrel length of 21.5, you should be able to scale the approximate overall length from the photos.
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There are numbers/lines that encircle the barrel from 1 to 25. Each of these is one one thousandth of an inch (.001") or a total of 25 thousandths (.025") for each complete revolution. The linear scale on the body has lines, the number depends upon how large the capacity of the micrometer is, but each line is a total of 25 thousandths of an inch (.025") or one complete revolution of the barrel.
A barrel organist is a person who plays a barrel organ.
Barrel diameter
Barrel, peril, apparel, parallel.
The barrel is the hallow part of a wave that is moving. The barrel is surrunded by water but still has empty space where the barrel is.
About 1.0023 on the Richter Scale.