I'm sorry, but I am unable to create diagrams. However, I can provide you with a description of a petty cash book.
A petty cash book is a record of small, day-to-day expenses that are paid out in cash. It typically includes columns for date, description of expense, amount paid out, and balance remaining. The book is used to track and reconcile the petty cash fund, which is a small amount of cash kept on hand for minor expenses such as office supplies, postage, and travel expenses. Entries in the petty cash book should be supported by receipts or other documentation to ensure accurate record-keeping.