Perpetual calendar from the 1900's with its patent

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This perpetual calendar is a patent of late Vince Farkas, issued in 1900 as the photocopy of the original patent shows. The patents number appears on the "neck" of the medal 17922. Although the patent shows the calendar with Hungarian text, the medal offered here has German text. The medal shows wear but it is rare in this form. Obverse: Shows the length of day and night and the rise and sunset times of different months. On the outer rim the name of month appear, that you can set and read the data respectively. Reverse: The days of week and dates Metal: some metal, I cannot identify Diameter: 26mm (1")-32.5mm Weight: 8.3gramm I have seen similar perpetual calendar but they omit the patent number, so it would be interesting to find out, which is the copy of which. A very interesting project for calendar medals collectors. I will send also the copy of patent if you wish,A similar design was auctioned here: /browse.html?auction=893&category=18615&lot=851880 It is interesting how Vince Farkas could get a patent for an existing design. perpetual calendar is a calendar valid for many years, usually designed to allow the calculation of the day of the week for a given date in the future. For the Gregorian and Julian calendars, a perpetual calendar typically consists of one of two general variations: 14 one-year calendars, plus a table to show which one-year calendar is to be used for any given year. These one-year calendars divide evenly into of two sets of seven calendars: seven for each common year (year that does not have a February 29) that starts on each day of the week, and seven for each leap year that starts on each day of the week, totaling fourteen. (See Dominical letter for one common naming scheme for the 14 calendars.) Seven (31-day) one-month calendars (or seven each of 28-31 day month lengths, for a total of 28) and one or more tables to show which calendar is used for any given month. Some perpetual calendars' tables slide against each other, so that aligning two scales with one another reveals the specific month calendar via a pointer or window mechanism. [1 ] The seven calendars may be combined into one, either with 13 columns of which only seven are revealed, [2 ][ 3] or with movable day-of-week names (as shown in the pocket perpetual calendar picture.Note that such a perpetual calendar fails to indicate the dates of moveable feasts such as Easter , which are calculated based on a combination of events in the Tropical year and lunar cycles. These issues are dealt with in great detail in Computus .An early example of a perpetual calendar for practical use is found in the manuscript GNM 3227a . The calendar covers the period of 1390–1495 (on which grounds the manuscript is dated to c. 1389). For each year of this period, it lists the number of weeks between Christmas day and Quinquagesima . This is the first known instance of a tabular form of perpetual calendar allowing the calculation of the moveable feasts which became popular during the 15th century. [4 ]Multiple wins can be combined to reduce cost for you! No matter how many coins you win, only combined weight counts! Usually additional USD1 for each coin you win.Payment: only Paypal is accepted.Refund Policy: Only if I grossly misrepresent this item. I will refund only the bid amount. Shipping and handling are not refundable. Refund will be sent after item has been returned to me.Payment needs to be received by me within 8 days of the end of auction. If payment is not received by then ebay automatically will start the 'Non Paying Bidder Alert Process'. Once the NPBA has been submitted, the buyer will have 3 days for payment to reach me. At that time, the item will be re-listed. If for some reason there is a problem sending payment, let me know, I'm easy to get along with and will work with you. read more

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