are usually put behind the dial so that one "branch" and one "stem" can be seen at the same time through two openings. The clock moves these disks one step each night, so that a new pair shows each day. Running in this manner, step by step, you will find that it takes sixty moves, that is sixty days, to bring the same pair around again. Each has a single syllable name, as shown on Fig. 20, and we thus get sixty names of two syllables by reading them together to the left. The two openings may be seen in the dials of Figs. 15 and 19. So the Japanese know exactly what day it is in a period of sixty which they used in their old calendars. These were used by the Chinese over four thousand years ago as the names of a cycle of sixty years, called the "sexagenary." The present Chinese year 4606 is YU-KI which means the year 46 of the 76th "sexagenary." That is, 76×60+46 = 4,606. In Fig. 20, we read TSU-KIAH, or the first year. If you will make two disks like Fig. 21 and commence with TSU-KIAH and move the two together you will come to YU-KI on the 46th move. But there is another way which you might like better, thus: Write the twelve "branches," or syllables, straight downwards, continuously five times; close to the right, write the ten "stems" six times. Now you have sixty words of two syllables and the 46th, counting downwards, will be YU-KI. Besides, this method gives you the whole sixty names of the "sexagenary" at one view. Always read _left_, that is, pronounce the "stem" syllable first. [Illustration: Fig. 19--Japanese Striking Clock with Two Balances and Two Escapements; Dial Stationary, Hand Moves]