Prior to the 1800s, ships crossing the Atlantic Ocean relied on the wind in their sails to make their journeys. But invention of steam power ushered in a new era of transportation that would change ocean travel forever: the steamship. Award-winning author-illustrator David Macaulay guides readers through the fascinating history that culminated in the building of the most advanced―and last―of these steamships: the SS United States. This book artfully explores the design and construction of the ship and the life of its designer and engineer, William Francis Gibbs. Framed around the author's own experience steaming across the Atlantic on the very same SS United States, Crossing on Time is a tour de force of the art of explanation and a touching and surprising childhood story.