Archimedes Screws

Archimedes Screws

The Archimedes' screw otherwise called as Archimedean screw or Screw Augers, It is a machine speaking historically, it is mainly used for transferring water from a low-lying body of water into irrigation ditches. The screw pump is commonly attributed to Archimedes Screws on the occasion of his visit to Egypt, but this tradition may reflect only that the apparatus was unknown before Hellenistic times and introduced in his lifetime by unknown Greek engineers

Applications

• Transferring water to irrigation ditches
• Draining land
• Used in sewage treatment plants
• To pumped out the water from an elcosed area
• Designed to lift fish safely from ponds, Desirable to minimize the physical handling of fish
• Depending on the length and diameter of the screws, more than one machine could be used successively to lift the same water

Working principle

An analysis, using the lifting of marbles instead of water, is used in almost all nineteenth century texts. The lower end of the helical tube dips into a dish of marbles and scoops one up. The helix continues to revolve, and the marble is continually being lifted a short distance up an inclined plane. The frictional forces are small, and the marble keeps rolling down an infinite succession of inclined planes formed by the revolving helix. At the same time the marble resides at the local low spot on the helix, and is carried up the slope by forces perpendicular to its local motion.