When is now?
Subtitle: Experiments with time and timekeeping devices
By: by Henry Humphrey and Deirdre O'Meara-Humphrey.
Contributors: O'Meara-Humphrey, Deirdre, joint author.
Edition: 1st ed.
Publisher: Doubleday
Published: 1980
Place of publication: Garden City, N.Y
Language: eng
Number of pages: 79
Subjects: Time -- Juvenile literature.; Time measurements -- Juvenile literature.; Time.; Time measurements.
Description: Gives directions for making several time-keeping devices such as a sundial and water clock and discusses some ancient knowledge about measuring time.
Notes: Bibliography: p. 79.