Answer:
Wilbur O. Atwater did not build a specific device to measure the calorie content of foods in the late 1800s. However, he was a prominent nutrition scientist who conducted experiments to determine the calorie content of foods using a bomb calorimeter. The bomb calorimeter is a device used to measure the heat energy produced when a sample of food or other combustible material is burned completely. This energy measurement can then be used to estimate the calorie content of the food.