National Geographic : 1919 Sep
WALTHAM THE CIENTIF ICALLV BUILT WATCH AND THE REIGN BUILT I WATCHPendant and Bow Patented Waltham Colonial A Extremely thin at no sacrifice of accuracy Maximus movement 21 jewels Riverside movement 19 jewels $150 to $275 or more depending upon the case Information to Protect You in Buying a Watch T HE escapement is the heart of a watch. Just as the heart pumps or pulsates the blood through the human body to main tain life and energy, so the escapement con trols the power generated by the mainspring' and transfers it into elements of time. The Waltham watch escapement controls the power transmitted from the mainspring through the train wheels to the balance wheel, which, in turn, divides the motion into intervals of time, pulsating 18,000 beats per hour - and this pulse beat is recorded on the dial by the hands. The escapement consists of the escape wheel, two pallet stones set in the pallet, and a fork, a roller and a roller jewel. The purpose of the pallet and two pallet stone's is to stop and release the escape wheel at the end of the train, at equal time intervals of about one-fifth of a second. The Waltham escape wheel has exclusive features. For instance, the most important part of the escape wheel is the impulse surface. In the Waltham watch this im pulse surface is trued by a diamond-cutting tool, which not only cuts it to absolute exactness, but gives it the high polish required by the Waltham standard of qual ity at the same time. In the foreign-built watch the impulse surface of the escape wheel is polished with a compound by hand, which invariably charges the surface with cutting pigments that practically defeat the vital reason for polishing, and is, therefore, detrimental to the component mech anism. This is one of the most important and one of the many reasons why you should insist that your watch be a Waltham. This story is continued in a beautiful booklet in which you will find a liberal watch education. Sent free upon request. WALTHAM THE WORLD'S WATCH OVER TIME "Mention The Geographic-It identifies you"