Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In horology, a movement is the internal mechanism of a clock or watch, as opposed to the case, which encloses and protects the movement, and the face which displays the time. The term originated with mechanical timepieces, whose movements are made of many moving parts. It is less frequently applied to modern electronic or quartz timepieces, where the word module is often used instead. In modern mass produced clocks and watches, the same movement is often put into many different styles of case. When buying a quality pocketwatch from the mid-19th to the mid-20th century, for example, the customer would separately pick out the movement and the case of his choice, and the movement would be installed in the case for him. Mechanical movements get dirty and the lubricants dry up, so they must periodically be disassembled, cleaned, and lubricated. One source recommends servicing intervals of: 3–5 years for watches, 15–20 years for grandfather clocks, 10–15 years for wall or mantel clocks, 15–20 years for anniversary clocks, and 7 years for cuckoo clocks, with the longer intervals applying to antique timepieces.

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