The second finger (third digit) has the most literal meaning of all. Less commonly referred to as the long or tall finger, the digitus medius manus sits in the center of the hand, right between the digitus secondus manus and the ring finger. How the middle finger became an offensive gesture is another story altogether.
To see how the pump works, look at the drawing below. The pump consists of a small diameter pipe (called the piston) inserted into a larger diameter pipe (called the cylinder). The drawing shows the pump at two points during its operation. The top drawing shows air being drawn into the pipe by pulling out the piston. The bottom drawing shows air exiting the pipe when the piston is pushed back in. At the right end of the pipe is a commercially bought one-way valve.
Bagless vacuums work in two main ways: 1  Filter Based â These machines use filters to clean the air. 2  Cyclonic â These machines still have a filter, but it forces the air into a cyclone pattern, which makes the filter more effective because less dirt needs to come into contact with it.ow âBaglessâ Works. Bagless vacuums work in two main ways: 1  Filter Based â These machines use filters to clean the air. 2  You can tell pretty easily if it needs a filter because you can usually see it right in the middle of the area where the dust and dirt is collected.