Error message

  • Notice: Undefined index: text_processing in _text_sanitize() (line 321 of /home/drupal7/modules/field/modules/text/text.module).
  • Notice: Undefined index: value in _text_sanitize() (line 321 of /home/drupal7/modules/field/modules/text/text.module).

Dipleidoscope

Conceived by Giovanni Battista Amici at the beginning of the 19th c. to determine true noon. The prisms double the solar image when the Sun is not on the optical axis of the telescope. If correctly placed on the meridian, the instrument determines true noon within 5-10 seconds

Maker: 
Date: 
1845 (c.)
Inventory Number: 
AST24
Instrument Categories: