Sheet, Explanation of the Perpetual Box-Almanack and Geographical Mirror

Sheet, Explanation of the Perpetual Box-Almanack and Geographical Mirror

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Description
This paper sheet is stored between two pieces of glass, with tape around the edges of the glass. It provides instructions for finding the day of the week for any date of the year, the time at different places on earth knowing the time in London, the astrological signs for different days of the year, and the phase of the moon using a specific instrument. This instrument is a combination perpetual calendar and horizontal sundial. For an example, see catalog number 330845.
Location
Currently not on view
Object Name
sheet
Physical Description
paper (sheet material)
glass (cover material)
tape (binding material)
Measurements
overall:.5 cm x 32.5 cm x 29 cm; 3/16 in x 12 25/32 in x 11 13/32 in
ID Number
MA.330846
catalog number
330846
accession number
305777
subject
Mathematics
Timekeeping
See more items in
Medicine and Science: Mathematics
Data Source
National Museum of American History
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