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Illustration from 'Architectura Curiosa Nova'
ARP23A10_130

Illustration from 'Architectura Curiosa Nova'

Heinrich Hertz's oscillator
ARP23A18_249

Heinrich Hertz's oscillator

A set of magic square filters used in early cinema projectors, 1898, by Henri Toulouse Lautrec
ARP17A01_466

A set of magic square filters used in early cinema...

The Royal Game of Ur
ARP11A03_340

The Royal Game of Ur

Planimeter used in conjunction with a set square for surveying
ARP07103_460000608

Planimeter used in conjunction with a set square f...