By referring to the calendar for the year 1911 one may see how the short lines for months are put in. As the pay weeks ended on Thursday, there were only four pay weeks ending in July, but there were five pay weeks ending in March. March 1 came on Wednesday. The last day of March was on Friday. The vertical co-ordinate lines for March show clearly that there were five Thursdays, and they also show the exact time relation of the Thursdays to the beginning and to the end of the month.

After the month scale for any fiscal year has been marked by hand on one card, any office boy can quickly copy the scale to other cards by superimposing the first card on the next card and copying the pen strokes from the first onto the second card. A supply of cards for any year can thus be made up at small expense, without having to have cards printed differently each year just because mankind has not yet made a calendar which always has the same relation between days of the week and days of the month. The scheme of indicating the relation of weeks and months by the short vertical pen marks permits the carrying on hand of a supply of printed cards which can be used for absolutely any fiscal year without danger of having to send the supply of cards to the scrap basket, as calendars are sent to the scrap basket

GRAPHIC METHODS