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Instead of a fork assembly ' pallets, Arnold's escapement had a locking p on a spring detent close to its connection ' the roller, and an impulse pallet on a groc section of the roller. The impulse pallet, termed a discharging pallet, would bend the tent spring after imparting an impulse to escape-wheel tooth, thus releasing another t< which was being held fast by the locking pa Because of the accuracy the detent esc: ment afforded, and because it was simple] construct by hand than the lever escapen was, the detent was soon being applied construction all in construction of all fine watches, and it domin; watch construction for more than a century i machine tooling made watchmaking a m production industry involving both mac! manufacture and handicraft.

The cover was an in dustrial photograph by Margaret Bourke-White of th< construction of a great dam near Fort Peck, Montana, k the style for which, as a photographer for Fortune, she was noted. The opening picture story, however, focused not on the construction, but on the life of the builders oi the dam and their families in temporary cities in the desert. It was not what the editors had assigned, and they wrote, by way of introduction: What the Editors expected—for use in some later issue-were construction pictures as only Bourke-White can take them. What the Editors got was a human document of frontier life which, to them at least, was a revelation.

The requirements of the Rules apply to steel vessels of all welded construction. Riveted construction, where used, is to comply with the applicable parts dealing with riveting in the 1969 edition of the Rules.