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.
The bandsaw blade is what actually makes a cut in the workpiece, or item to be cut. Typical bandsaw blades have hooked teeth which cut material away from the workpiece. Other styles of blade include grit edge and slicing, or knife edge, types of blades. The bandsaw is the machine which carries the blade. It includes the wheels and motor for turning the blade, and a table or other fixture for positioning the workpiece and moving it into the blade.