Here's how to install a new internal drive as extra storage or as a new boot drive. Here, we installed Seagate's Barracuda 7200.10, a $124, 320GB Serial ATA (SATA) drive, inside a Dell Dimension 8400 running Windows XP Home Edition.
The tamping rod is a round, straight steel rod used with concrete cylinder molds, slump cones, and unit weight tests. Measures 5/8 diameter by 24 length. Both ends are rounded to a hemispherical tip. The tamping rod is plated for rust resistance and has a 6 scale in 1/4 increments engraved on end of the rod for measuring the slump. The Cat# TR375 is a 3/8 diameter by 12 length, rounded hemispherical tips, less scale.
A small metal or plastic shaft potentiometer or pot is a variable resistor. By connecting battery across the two ends one get variable voltage at the wiper. Hence it is called potentiometer. A carbon deposit is used as resistor in this case or wire wound potentiometers are also are available. In the second type of potentiometer wire of 1m, 4m or 10 m are used as potential divider. The wires are stretched across a wooden base.