Klepsydra plan ... Original missing. One copy in Princeton (PK 2024). Dirty Faded Diazotype Printing Ink ... 1957 ... Klepsydra plan.
Klepsydra: working drawings ... See PD 129. Dirty Cartridge Paper Drafting Ink ... Klepsydra: working drawings.
Klepsydra: working drawings ... See PD 128. Dirty Cartridge Paper Pencil ... Klepsydra: working drawings.
Klepsydra with dipinto ... Horizontal (normal) ... Klepsydra with dipinto.
