In addition to the provision of conventional beating reeds, Schulze provided two free reeds : the pedal Contra Posaune 32 and Posaune 16.
2.
The clepsydras with dial and pointer for indicating the time, and added elaborate " alarm systems, which could be made to drop pebbles on a gong, or blow trumpets ( by forcing bell-jars down into water and taking the compressed air through a beating reed ) at pre-set times " ( Vitruv 11.11 ).
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