The stratosphere (/ËstrÃ¦tÉËsfÉªÉr, -toÊ-/) is the second major layer of Earth's atmosphere, just above the troposphere, and below the mesosphere. About 20% of the atmosphere's mass is contained in the stratosphere.
The chainsaw is a highly effective and efficient tree and branch cutting power tool. It works with an engine, referred to as a power head; powering a metal chain, driven by a centrifugal clutch, with a chain moving around a groove in the guide bar at fast speeds.
How to Measure a Chainsaw Chain. Chainsaw blades are sharp, so always begin by taking a few safety precautions. Also, make sure to wear a good pair of protective gloves when working on the blade. As always, the kill switch should be off and the spark plug wire disconnected. Begin by measuring the length of the guide bar attached to the saw. The chain length will directly correspond to the measured length of the bar from the nose or tip to the base.