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Publication numberUS773669 A
Publication typeGrant
Publication date1 Nov 1904
Filing date5 May 1904
Priority date5 May 1904
Publication numberUS 773669 A, US 773669A, US-A-773669, US773669 A, US773669A
InventorsThomas O'shaughnessy
Original AssigneeThomas O'shaughnessy
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Perpetual calendar.
US 773669 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

No. 773,669. PATENTED NOV. 1 1904.



/ {irst Figures of Centuries y 3 to left 2 to left 1 to left Center 1 to rgt 2 to rgt 3 to rgl a 14 I 1 en, NE

31 Ape, June, Sept. and Nov. so

K days, Feb. 2&29,all others 3| For this and all centuries whose first figures are in center column find color of desired month in column under year. For centuries, one, two or three columns to right or left of center; find color of month in first, second or third column to right or left of year, according to location of first figures of century. Use Jan. and Feb. in italics for leap years.

Wine ss I nv g i j entor.



PATENTED NOV. 1, 1904.


l 2 .96 4' .98 5 6 7 .89 .95 .84 .90 .85 .91 .86 97 .87 .92 .93 -.99 88 .94, F 2 .72 .78 .73 .79 .68 .74 .75 .80 .70 .81 .76 .82 .77 .83 wo .61 .57 .55 .52 .57 .53 .58 69 .59 .54 .55 .71 .50 .55 .44 .50 .45 .51 .40 .46 .47 .52 .42 .53 .48 .54 .49 .55 .33 .39 .28 .34 I .29 .35 .30 .41 31.36 .37 .43 .32 .38 .16 .22. .17 .23 .12 .18 .19 .24 .14 .25 .20 26 .21 .27 .05 .11 .00 .06 .01 .07 .02 .13 .03 .08 .09 .15 .04 .10

Jan. Apr. Sept. Feb. Aug. Oct. July Dec. June Mar. Feb. May

Jan. Nov. Sun. Mon. Tue. Wed. Thu. Fri. Sat.

Jan. Apr. Sept. Feb. Aug. 7 May Oct. July Dec. June Mar; Feb.

Jan. Nov. Mon. Tue. Wed. T1111. Fri. Sat. Sun. V Aug. 7 Jan. Apr. Sept. Feb. Feb. May Oct. July Dee. June Mar. Jan. Nov. Tue. Wed. Thu. Fri. 52.1. Sun. Mon. Feb. Aug. J an. Apr. Sept. Mar Feb. May Get. July Dec. June Nov. Jan. Wed. Thu. Fri. Sat. Sun. Mon. Tue. Feb. Aug. Jan. Apr. Sept. June Mar. Feb. May 001;. July Dec. Nov. Jan. Thu. Fri. 5&5. Sun. Mon. Tue. Wed. Sept. Feb. Aug. .1511. Apr. Dec. June Mar. Feb. May Oct. July Nov. Jan. Fri. Sat. Sun. Man. Tue. Wed. Thu. Apr. Sept. Feb. Aug. Jan. July Dec. June Mar Feb. May Oct. Jan. Nov Sat. Sun. Mon. Tue. Wed. Thu. Fri.

. & -15 16 11' 20 21 Apr., June, Sept. and Nov. 30 days. Feb. 2829. All others 31.


31500. 2101511. Halafi. Banter. I right. 215 right. Murighi. 17 21 16 20 19 18 22 s 25 24 23 26 00 7 5 1 5 12 4 11 3 10 2 9 l 8 14 l9 l8 17 16 15 M I J i I t Oven 01. 1111585 250m? flhzgqg i b No. 773,669. PATENTED NOV. 1, i904; T. OSHAUGHNESSY.




First igurea of Qenturies 3 to ieft 2 to left 1 to left Center 1 to rgt 2 to rgt 3 to rgg 17 2: 1620 151 18 22 New 25 24 23 26 Style 7 6 13 12 1 11 3 2 9 1 9 14 9 18 17 16 15' 1 A 1: 3 4 Feb? 7 Jan. J Sept. AUG.

u g. June Man lviay. 001. (122% Dec. NOV R 5 .96 98 .8490 .85,.91 .8782 .93, .99 .8894 .73..79 8.74 .70,,81 .76.s2 .77,,.s3 .56 .62 .S7,.63 .59 15% .6557]; 0.66 .45, .51 .4.46 .42,.53 .4s.54 .49, .55 28.34 29,55 .3136 .37, $1332.38 .17,.23 332.18 .14, .25 .2o.26 21, .27

.00 .06 .01..07 Mon? Tue? Tue Wed? Wed? Thu? 'Ehul W5] 5 fiat? Sam? .osos .09..1s .m .10 Thu? hi 81%. mi see? sun. W Sat Sun? Mon? Son? Mon? fine? Mama? We? Wed? "We? 1 Fhu? Wed? Apr June, Seph and Nov, days, Feb. 2& ail othesrs 3! For this and all centuries whose first figures'are in center column find color of desired month in col umn under year. For centuries, one, two or three columns to right or left of center; find color of month 'in first, second or third column to right or left of year, according to location of first figures oi century. Use Jan. and Feb, in italics for leap years.

Witnesses I Z d" M UNiTED STATES Patented November 1, 190d.



SPECIFICATION forming part of Letters Patent No. 773,669, dated November 1, 1904.

Application filed May 5,1904. Serial No. 206,586. (No model.)

To (0Z1 7072 0772, it may concern:

Be it known that I, THoMAs OSHAUGH- NESSY, a citizen of the United States, residing at San Jose, in the county of Santa Clara and State of California, have invented a new and useful Perpetual Calendar, of which the following is a specification.

This invention relates to calendars, and has for its principal object to provide in a simple and convenient form a calendar by means of which the month and day of the week of any date may be readily ascertained.

A further object of the invention is to so arrange the calendar-table that dates may be.

ascertained according to the Julian and the Gregorian calendars, so that it may be conveniently used for ascertaining dates in any country. I

With these and other objects in view, as will more fully hereinafter appear, the invention consists in the novel construction and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is a view of a perpetual calendar arranged in accordance with the invention. Fig. 2 is a similar view indicating a slight modification of the invention. Fig. 3 is a similar view illustratinga further modification. Figs. 4 and 5 are fragmentary views illustrating still further modifications of the invention.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

In calculating dates it has been found that all of the centuries can be divided into seven groups, and this permits of the convenient grouping of the months and the arrangement of the days of the week in such relation that each will form an indicator for the other.

In carrying out the invention a table is prepared, and said table is ruled in such manner as to divideit into seven parallel verticallyarranged columns, which for convenience are designated from left to right 1, 2. 3, 4, 5, 6, and 7, and each of these columns are subdivided into spaces by horizontallydisposed parallel lines in the manner hereinafter described. In the second horizontal column 9, which divides the upper portion of the table into seven transverse squares, are arranged two sets of numerals expressing the first figures of each centuryin the present instance from O to 26, although this number may be increased to any desired extent in order to take in a greater number of future centuries. The upper set of numerals is arranged in two horizontal columns, the numerals running from 15 to 26, inclusive, in order to represent the centuries since the adoption of the Gregorian calendar, and these are printed in ordinary type, and in the last square to the right are printed the words New style on the same lines with the figures. Below the numerals designating the centuries of the Gregorian calendar are printed two rows of numerals from O to 20, these being in italics and referring to the Julian calendar. and while it would be unnecessary in most cases to continue the line beyond 15 the additional centuries are added in order that the calendar may be used to advantage in the calculation of dates in Russia and other countries which har e not yet adopted the Gregorian calendar.

Immediately above the horizontal column 9 is a horizontal column 8, and in the transverse row of squares so formed is printed, reading from left to right, 3 to left, 2 to left,

1 to left, center, 1 to rgt. 2 to tant that these diiferent groups of monthnames should be distinguishable from each other, and for this purpose they are in the present instance printed in different colors, Jan. and "Oct. 111 the first column being printed in crimson, Apia, July, and Jan. in the second column being printed in blue, Sept. Dec. being printed in dark red, June in the fourth column being printedin black. Feb, Main, and Nov. in the fifth column are printed in brown. Aug. and 1 127). in the sixth column being printed in yellow, and Hay in the last column is printed in green; but these may be modified by printing auxiliary reference numerals, such as 1, 2, 3, 4:, 5, 6, 7 in the several columns, as shown in Fig. 3, or in similar manner by the printing of other reference characters or symbols by which each group may be instantly recognized.

Below the names .of the months is a horizonal column 11, dividing the table into another series of seven transverse blocks or squares, and in these are printed numerals representing the last numbers of the years, as 01, 02, O3, and so on, and these are so grouped that each will appear in its proper column in position to be used as an indicator in following out the name of the desired day of the week. In addition to this attention is directed to the leap-years by print ing the numerals representing leap-years in bold-face type, and by thus calling attention to leap-years the user will be properly directed in the use of the names of the months, each table being so arranged that the Jan. and Feb. month-names that are printed in italics shall be used in ascertaining the name of a day in those months during leap-years.

Immediately below the squares bearing the final numeralsof the years are seven horizontal rows 12, which with the vertical ruling above described divide these spaces into fortynine blocks or squares in which are printed in abbreviated form the names of the days of the week, and these are printed in different colors, the colors corresponding to the colors used in printing the month-names, or if numerals or other symbols are employed for distinguishably designating the different month groupsthe same rule is followed that relates to the table of days.

The orderly arrangement of colors is such that if arranged on a cylinder with the end of I the column at the right of the table in contact with the beginning of the column at the left the corresponding colors would appear in substantially helical lines,following each other in parallel order around the cylinder, and the names of the days would also appear in continuous relation that is to say, in the first horizontal column Sat. at the end of the column will appear in advance of the Sun. at the beginning of the column, while in the second column Sun. at the end of the column would appear in advance of Mon. at the beginning of the column. In addition to this the names of the days are also arranged in a somewhat similar manner with relation to the vertical columns, and it will be seen that starting from the upper left-hand corner of the table of squares the names of the days of the week may be read in regular order, beginning with Sun, either in the first horizontal column or in the first vertical column.

The most conspicuous instance of the relation of the colors in the chart is the central diagonal row of names that are printed in crimson, starting with Sun, Tue, "hu., Sat, Mon, XVed, and Fri, and above these and parallel thereto is a diagonal row that is printed in blue, and so on throughout the whole of the day-name table.

Below the horizontal column 12, in which are printed the names of the days of the week, is amonth calendar-table 13, bearing numerals from 1 to 31 and arranged in the usual order, while in the lower left-hand corner of the month calendar-space is printed a legend giving the numbers of days in different months.

At a point below the month calendar-table are directions for using the calendar, as follows:

For this and all centuries whose first fig ures are in center column find color of desired month in column under year. For centuries, one, two or three columns to right or left of center; find color of month in first, second or third column to right or left of year, according to location of first figures of century. Use Jan. and Feb. in italics for leap-years.

As an instance of use should it be desired to find the day of the week on which July 4, 1901, will fall the user will first seek the 19 in the new-style columns of figures and will find the same in the center square of the horizontal column. This is a primal or basic column from which the other columns start, and the directions from the horizontal column 8 above the remaining squares that bear centu rynumerals--that is to say, 1 to the left, 1 to the right, and so onare for the purpose of guiding the user in subsequently finding the name of the day. Having found the numeral 19 in the central column, the user then seeks O4 in the year-columns and finds the same in the end square of the horizontal row 11. The name of the month, July, is then found, and the user observes the color in which the name of the month is printed-in the present instance blue or it may be that the designating character 2 or other symbol appear in the square bearing the name of the month. Having ascertained the color or other distinguishing feature of the name of the month, the user follows downward in the column bearing 04, following the names of the days of the week until he arrives at a name the color of which corresponds to that in which the name of the month is printed or a name adjacent to which is printed a distinguishing character or symbol corresponding to that of the month. In the present instance the user will find Thu. printed in blue, corresponding to the blue color of the July name. The user then traces down the horizontal column in which Thu. appears until he arrives at a point over the number 4 of themonthtable, whereupon he finds that at the juncture of the two columns of Thu. and of 4 there is printed the abbreviation Mon, showing that July 4, 1904, will fall on Monday. Should he desire to find the name of the day on which July 4, 1805, fell, he will first find 18, the first numerals of the nineteenth century. In the second column to the right of the central column and above this he will find printed 2 to rgt, meaning two to the right. He will then find the year-number 05 in the first column of the year-table and, following directions, will trace on the first from the column where 05 appears two other columns to the right. Having now ascertained that July is printed in blue, he will trace down this last column until he arrives at the name of a day of the week printed in corresponding colorblueor one bearing a corresponding designating-mark. He will then trace toward the right until over the numeral 4 of the month-table, and at the juncture of these two last-named columns will be found Thu, showing that July 4, 1805, fell on Thursday.

In the modification illustrated in Fig. 2 the names of the months are printed, and instead of the single transverse row of month-squares there are seven of such rows, and this permits of the more convenient use of the calendar in that it is merely necessary to follow down from the year-column whether the dates are in the present century or in any other century of the center column until the name of the month occurs,and thence by following through the vertical column in which the day of the month occurs the name of the day will be at once ascertained. For instance, if it is desired to find the name of the day on which July 4, 1905, will fall the user first locates 05, which is in the column to the extreme left, and thence follows down through until he finds the name of the month July. The horizontal column of the July month is then followed until the vertical column in which 4 is placed is reached, and at the juncture of these two columns will be found Tue. showing that July 4, 1905, will fall on Tuesday. For July 4, 2005, the figures 20, designating periods in the twenty-first century, are found in the first column to the left of the center, and this indicates that the user of the calendar must then start at the first column to the left of the one containing the figures 05, which in this case would be the column at the extreme right of the chart. Following down until the name of the month is found, which is in the second horizontal column from the last, and thence across until the column with 4 is reached it is found that July 4, 2005, will fall on Monday. In similar manner the name of the day of the week of anyday in the Christian era may be readily ascertained and either the Julian or Gregorian calculating method followed. It is of course obvious that the numerals representing the centuries may be increased to a practically unlimited extent, the present calendar being used for ascertaining days in but twenty-six centuries; but it is to be understood that this is merely typical and that any desired number of centuries may be added or that the device may be used with but a single century, and thus materially simplify matters.

The division of the name of the months and the figures representing centuries and years into seven columns is rendered necessary by the fact that a month may begin on any day of the week, and a year may also begin on any day of the week. It is obvious that the various columns may bear distinguishing-marks, such as numerals or letters, in order that their relation may be more easily understood, and that instead of using printed abbreviations representing the names of the days the numerals 1 to 7, inclusive, may be employed, as shown in Fig. 4.

It is still further obvious that instead of distinguishing the months by printing the same in different colors they may be printed in different type in order to save the expense of printing in seven different colors. In Fig. 5 is illustrated an arrangement of calendar wherein seven different fonts of type are used for the printing of the d ay-names, corresponding type being employed for the printingof the month-names in corresponding column.

Having thus described the invention, what is claimed is- 1. In a perpetual calendar, a sheet divided by parallel rulings into a number of verticallydisposed parallel columns and further divided by horizontal rulings into squares or blocks, century -designating tables arranged in one set of blocks, month-designating tables arranged in a second set of blocks, and the month characters or symbols of each block be ing of the same character and of different character from the month characters or symbols of the other blocks, year-designating tables arranged in a third set of blocks, daynames arranged in a fourth row of blocks, the day-names having distinguishing characteristics corresponding to those of the month symbols, and a day-of-the-month calendar-table arranged in a fifth set of blocks, substantially as specified.

2. In a perpetual calendar, a day-of-themonth calendar-table in which the figures are divided into seven groups or columns, a yearindicating table also .arranged in seven corresponding columns, the figures representing years being grouped in predetermined order, month and day-of-the-week indicators also divided into seven different groups arranged in predetermined order, and a century-indicating table divided into seven groups bearing a predetermined relation to the year, month, d ay-of-the-week and day-of-the-month groupings, substantially as specified.

3. In a perpetual calendar, a day-of-themonth calendar-table, a day-of-the-week-indieating table divided into seven dii'ierent groups, and all of the names of the days of a week being arranged in each of such groups, a year-imlicating table in which are grouped in predetermined order with relation to said day-of-the-month and day-of-the-week tables all of the terminal figures of a century, and a century-indicating table having figures ex pressing the different centuries arranged in predetermined groups and each of such groups serving by its position to direct the user to the proper day'of-thewveek column, substantially as specified.

4. In a perpetual calendar, a day-of-themonth calendar-table in which the numerals are divided into seven difi'erent columns, a day-of-the-Week-indicating table in Which the week, such names being distinguishably designated, a month-indicating table also divided into seven groups that are distinguishably designated in similar manner to the day-distinguishing characteristics, year indicating tables arranged in groups in predetermined relation to and in a position between the month-indicating table and the day-indicating table, and a century-indicating table in which numerals designating the difl'erent centuries are grouped in predetermined order and distinguishably designated to indicate periods of both the Julian and Gregorian calendars.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two Witnesses.



J. Ross CoLHoUN, C. E. DOYLE.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4319771 *15 May 198016 Mar 1982Rafael Esquivel YglesiasProgrammable agenda
US4472893 *15 Dec 198225 Sep 1984Sandro CurtiCalendar agenda
US4813707 *11 Mar 198821 Mar 1989Habib Mohammed KPerpetual calendar
US20030167664 *6 Mar 200311 Sep 2003Bruce MullinaxOverlay calendar
Cooperative ClassificationB42D5/04