Jen They had an electric saw for me - it looked like it was spinning but was just shaking
It is called an oscillating saw and typically used to remove casts.
And yes, the time of casts made from plaster is over. Today a special plastic material is used. Soak in hot water for one minute, squeeze as much water out as possible by tightly rolling it. Apply to patient and hold it I the desired position for 5 minutes, done.