This is a Sabre Saw, aka, Jig Saw. This saw uses a blade that travels up and down. This cut is being bad using a piece of wood as a straight edge. The line that needs to be cut was marked at both ends, then the wood was placed 1 1/4″ from the line. This is the distance from the edge of the base place to the blade.
![1u3](http://hstech.org/wp-content/uploads/ImagesM/1u3.jpg)
This saw is often used to cut curved patterns. It is being used here to cut an opening in a flat. You can get an assortment of blades to cut a variety of materials, including: wood, metal and plastics.
![1u4](http://hstech.org/wp-content/uploads/ImagesM/1u4.jpg)
Be sure to always wear safety goggles when using one of these tools.
![1u5](http://hstech.org/wp-content/uploads/ImagesM/1u5.jpg)
You can see that the blade extends below the work you will be cutting. Be careful not to cut into the table
![1u6](http://hstech.org/wp-content/uploads/ImagesM/1u6.jpg)