| GMD | Text |
| Classification | 529.78 C286 |
| Publisher | East Sussex, Wayland, c1982 |
| Subject | Clocks and watches -- Juvenile literature.Time measurements -- Juvenile literature.Time -- Juvenile literature. |
| Series | Young Scientist series |
| Description | 32 p. : ill. ; 24 cm. |
| ISBN | 0853409129 |
| Additional ISBN | 9780853409120 |