RECORD OF SERVICE (SERVICE BOOKS) — The service book is a contemporary record in minute detail of a person’s official career. Non-pensionable service should be distinctly shown as such in column 2 of the service book, and every entry should be attested at the time by the head of the office. It is the duty of all heads of offices to see that the service books of the establishments employed under them are punctually and regularly written up, that the entries made on the opening pages are re-attested at least every five years, and that no member of the office has access to the books.