This article presents a 17th-century recipe for a strong mortar, suitable for creating a flat surface for a vertical sundial. From Richard Neve's 'The City and Country Purchaser, and Builder's Dictionary,' it uses lime and sand with linseed oil or skimmed milk. A tougher version includes 'boring/gun dust.' The author notes fast-drying and cracking issues, suggesting alternative preparations, and contextualizes Neve's architectural dictionary.
Dials: Vertical,
Historical Dials