(Wurlitzer Catalogue Illustration courtesy of Q. David Bowers.)

Rear view showing closed view of Caliola. Using a worm gear arrangement as shown above allows for the drive pulley and belt drive for the electric motor mounted on top of the case to be safely away from the keyboard.

(Wurlitzer Catalogue Illustration courtesy of Q. David Bowers.)

Rear view showing instrument in position for playing by hand. Here the upper raisable panel is lifted up just enough to provide easy, unobstructed access to the keyboard.

(Wurlitzer Catalogue Illustration courtesy of Q. David Bowers.)

Rear View showing roll arrangement for playing automatically. Here the music rack has been set aside and the back panel lifted enough to provide full access to the roll mechanism.

(Wurlitzer Catalogue Illustration courtesy of Q. David Bowers.)

View showing motor installed on organ ready to play. The small rectangular panel near the top of the case is for accessing and adjusting the pump stick bearings on the vacuum pump. The wider rectangular panel near the bottom of the case is for accessing and adjusting the pump stick bearings for the pressure pump. The two vertical metal plates about the same height as the worm gear box on the backside of the case are reinforcements for the bolts that hold the crankshaft bearings on the inside of the case. The small crank a little more than midway up the case is for adjusting the tempo (music roll speed).