This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
The accompanying illustrations show a design for a clock case. The upper is a front elevation showing the clock itself in position, whilst the lower is a section. If the design is not wide enough, an additional pilaster on each side may be added. The ornament in spandrils and tympanum should be incised and gilt.

Design for a Marble Clock Case.
 
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