This book describes the construction of two different clock projects - an eight day regulator clock and a month going regulator clock - and features full-page fully-dimensionalised working drawings supported by detailed photographs. It also includes instructions and plans for constructing glazed wood cases for each project. It is intended for model engineering hobbyists with basic facilities to enable them to venture into the field of horology by building their own precision clocks which can become treasured family heirlooms. The term 'regulator' simply describes a precision clock. Every clockmaker and repairer needs such an instrument to use in regulating his repair and new work. The typical English regulator, as described in the first section, beats at one second intervals and will run for eight days between winding. The second project is a month going regulator clock, an equally high precision type which will run for a whole month between winding. This book is based on a popular series of popular articles originally published over many years in Model Engineer magazine.