The fifth floor held a sifter, separator, and a centrifugal machine. An alternative to the high frequency vibrating screens is the rotary sifter. Lowe Simpson, Orville's son, designed and patented a new sifter for the mill. Either remove the larger and medium-sized particles by hand or use a sifter. For example, she created a Denver Broncos (her favorite football team) sifter basket. In URL Interrupted, Raven discusses with Sifter about her school life. The gyratory sifter operates at a gentle pace, and has a non-robust motion during operation.