A flat wooden frame laid on the chamber floor and used to locate the various parts of the organ.

Prior to shipment, instruments would be assembled at the organbuilder's factory in an erecting shop (a high-roofed workshop) to verify the correct assembly and function. The instrument would then be dismantled and shipped to the theatre for re-erection. The use of a ground frame considerably speeds up this re-assembly process.

Click here to see a 1920's photograph of a theatre organ assembled in an erecting shop, prior to dismantling and shipping to its final destination.

The photo is a section of the Liberty Theatre, Portland Oregon Wurlitzer in the factory erecting sho