BRASS PERPETUAL CALENDAR / LUNAR CALENDAR
Stock Number: 8088
For sale, small brass perpetual calendar / lunar calendar with rotating disk for Day of the Month on one side. The other side carries a volvelle for Moon's age and dating the lunar month.
1-1/2" (3.7 cm)
c. 19th century
Country of manufacture
UK and Ireland
PERPETUAL CALENDAR / LUNAR CALENDAR, English, 19th century, made of brass 1-1/2″ (3.7 cm) in diameter. One side has a rotating disk marked “Day of the Month For Ever,” with a smiling sunface and a ring of month dates. This reads against a fixed ring of weekdays. The other side has a volvelle marked “Moon’s Age, Phases, and Southings,” with circular scales of twice-12 hours, date of the lunar month, and weekdays. An eccentric circle indicates fullness of the moon. In fine condition, this is an uncommon form of lunar / solar calendar. We note a variant version, undoubtedly by the same maker, marked as a tidal calendar “High Water and Moon¹s Age” (Tesseract Catalogue 38, item 58). (Featured in “Wondrous Devices” exhibition, Hudson River Museum, 2018).
Ask the Dealer
David and Yola Coffeen both have enjoyed academic careers, as planetary astronomer and as linguist/educator. But since 1982 (yes, 1982!) they have been full-time dealers in early scientific and medical instruments, under the name Tesseract. Selling primarily by catalogue (over 100 issued so far) they also have a web presence at www.etesseract.com, and can be contacted at firstname.lastname@example.org.