When is Now?: Experiments with Time and Timekeeping Devices

by Henry Humphrey

Gives directions for making several time-keeping devices such as a sundial and water clock and discusses some ancient knowledge about measuring time. This description may be from another edition of this product.

• Format: Hardcover
• Language: English
• ISBN: 0385132158
• ISBN13: 9780385132152
• Release Date: May 1981
• Publisher: Doubleday Books
• Length: 79 Pages
• Weight: 0.70 lbs.
• Age Range: 11 to 12 years
• Grade Range: Grades 6 to 7