Sheet, Explanation of the Perpetual Box-Almanack and Geographical Mirror
notes: label: Description
content: 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.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
label: Subject
content: Timekeeping
setName: label: See more items in
content: Medicine and Science: Mathematics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.330846
label: catalog number
content: 330846
label: accession number
content: 305777
objectType: label: Object Name
content: sheet
physicalDescription: label: Physical Description
content: paper (sheet material)
label: Physical Description
content: glass (cover material)
label: Physical Description
content: tape (binding material)
label: Measurements
content: overall: .5 cm x 32.5 cm x 29 cm; 3/16 in x 12 25/32 in x 11 13/32 in