Occupations in navy yards. Shop trades : Power plant; machine shop; boiler shop; blacksmith shop; pattern shop; jointer shop; pipe shop; foundry; copper shop; sheet-metal shop; galvanizing shop; electrical department; rigging loft; mold loft. Outside trades, office work, and miscellaneous occupations : Shaping, bending, and cutting steel frames and plates; riveting, chipping, and calking; ship fitting; supply department service; office work; miscellaneous occupations.