Another marvel of the periodical of our day is the printing of some of the pages in the full colors of the original paintings. To get this result, it is necessary to print the sheet in four colors and to have each printing in exactly the correct spot on the sheet (a variation of only a hundredth of an inch being detrimental). The process would normally be quite slow--too slow, in fact, for the tremendous quantities necessary for the large editions of the modern magazine. Both of these objections have been overcome, however, by arranging four small cylinders, each printing its designated color--yellow, red, blue or black--so that as the sheet of paper travels around a larger cylinder it is brought into contact with the four printing cylinders in rapid succession. Many magazines print two colors for covers and inside pages, instead of full four-color printings. Presses of a nature somewhat similar to those explained above are used. So much for the principal mechanical problems and their solutions, in producing millions of magazines of a high quality each week. But there must be some force that keeps this maze of machinery constantly at work, so that all the parts properly co-ordinate. A slip-up at one spot might cause such a delay as would result if, for instance, hundreds of thousands of the inside pages were printed and ready for binding, but lacked the printed covers. To prevent any such calamity in the work rooms, there is usually prepared a daily schedule which plots out what operation, on each issue of the magazine, is to be completed that day; and if by chance any operation is not up to the schedule, immediate steps are taken to speed up the work until the production has been brought back to where it should be. And this schedule reaches out into the shipping and mailing departments, so arranging it that the first copies off the press are speeded to the far sections of the country. In this way all the copies as they come from the presses are dispatched, so that the man in San Francisco and the man in Philadelphia find the magazine on the news-stand on the same day. * * * * * How did the Ringing of the Curfew Originate? The word “curfew” is derived from the French “couvre-feu,” meaning “cover fire.” The ringing of the curfew originated in England by William the Conqueror, who directed that at the ringing of the bell at eight o’clock all fires and lights should be extinguished. The law was repealed by Henry I in 1100, but the bell continued to be rung in many districts to modern times and probably may still be heard. The name was also given formerly to a domestic utensil for covering up a fire. In the United States an ordinance establishing a curfew, with the purpose of keeping young people off the streets, has existed in Salem, Mass., since Puritan days.