Publisher's Synopsis
Taken from a series which looks at the different forms of non-verbal communication, this book deals with codes and ciphers. This series has been specially designed to meet the needs of cross-curricular project work within the framework of the National Curriculum, and should be of use as a resource for children's topic work on communications.;This book explains and deciphers many of the codes in current use: bar codes; chemical symbols; the Dewey decimal system; semaphore; morse code; international flag code; ordinance survey and weather map codes. The author also describes how codes and ciphers are an important way of transmitting secret information.
