National Geographic : 1920 Nov
xt SCfliHENCALY I BIIT IN WOfD The Waltham Scientific Method of Mounting Jewel Bearings that is so Important in Your Watch Pendant and Bow Patented Waltham Colonial A Extremely thin at no sacrifice of accuracy Maximus movement 21 jewels Riverside movement 19 jewels $200 to $325 or more depending upon the case T HE bearings of a watch are jewels because a precious stone is the hardest known substance for use in this important function. The harder the material and the smoother its pol ish the less resultant friction. The chief problem confronting the old time watchmaker when he first con ceived the idea of using precious stones was a correct method to secure properly the jewels in the plates of the watch. To do this, he cut a seat in the watch plate, then with a sharp tool forced the metal over the edge of the jewel. So important was the necessity of secur ing the jewels rigidly in relation to their bearings (with the pivot hole exactly in the center and the jewel in perfect align ment with the plate and pivot so that the jewels could be removed easily for cleaning or repairing when injured) the Waltham Watch Company, after years of painstaking development, cre ated a scientific method of jewel setting which made it easy for the jewels to be so removed and reset without affecting in any way the original time-keeping quality of the watch. This scientific Waltham Method secures the jewel in a separate brass or gold set ting. This setting is cut to a diameter to fit perfectly its aperture in the plate, then pressed to its correct position in relation to the pivots (or axle) com pleting the jeweled bearing. The special tools invented by Waltham so expand the jewel setting in its aperture that it becomes rigidly located. This eliminates the method of using holding-screws and greatly simplifies the work of the watch repairer whenever it is neces sary to replace a jewel bearing. The Waltham Scientific Method of mounting jewel bearings is a distinctive and better way of securing the jewels in the setting, and also of the setting in the plate. It provides the easiest and safest way for the repairer to handle your watch. It protects the original time-keeping quality of the watch. It reduces up-keep and insures a continuous satisfaction because of de pendable time-keeping service. This is one more reason, in addition to many others of like value, why your watch selection should be a Waltham. WALTHAM THE WORLD'S WATCH OVER TIME "Mention The Geographic-It identifies you" This story is continued in a beautiful booklet in which you will find a liberal watch education. Sent free upon request. Waltham Watch Company, Waltham, Mass.