Stage lifts and orchestra lifts are specialized elevators, typically powered by hydraulics, that are used to raise and lower entire sections of a theater stage. For example, Radio City Music Hall has four such elevators: an orchestra lift that covers a large area of the stage, and three smaller lifts near the rear of the stage. In this case, the orchestra lift is powerful enough to raise an entire orchestra, or an entire cast of performers (including live elephants) up to stage level from below. There's a barrel on the background of the image of the left which can be used as a scale to represent the size of the mechanism COUNT 4
QSN1 How are stage lifts powered? ANS1 by hydraulics QSN2 How many hydraulic elevators are there at Radio City Music Hall? ANS2 four QSN3 What is an orchestra lift used for? ANS3 to raise an entire orchestra, or an entire cast of performers (including live elephants) up to stage level from below QSN4 What is on the background of the image which can be used as a scale to represent the size of the mechanism? ANS4 a barrel