The Tibia Plena shall be a powerful stop of unimitative Flute tone, capable of supporting the high-pressure Tubas and of the scale usually employed in Hope-Jones organs. The Dopple Flute shall have double mouths from C and shall be in type a Dopple Rohr Gedeckt, being a covered pipe with the stoppers bored. Details of this special stop will be given by the architect. The quality of the reeds must be of the highest class.

The Saxophone shall be a broad, powerful stop imitative of the orchestral instrument. The French Horn shall be of large scale, covered at the top with a resonating chamber and tuning slip cut in the side with a double roll so as to adjust both the resonating chamber and the pitch. The eschallot shall be pocketed. The Tuba shall be a unit of eighty-five pipes. Great care must be taken with this stop. It must be of great power and dignity and as the most powerful voice in the organ must add at least thirty-five per cent. in power to the balance of the organ when drawn. The Grand Viol is to be of broad string tone, produce the effect of the united orchestral strings without any undesirable "cut" or "edge". The Tibia Plena and the Dopple Flute are units and the Wald Flute and Rohr Flute are derived [from them] by extension. This organ shall be enclosed in a special swell box.