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IF any Gentleman studious in the Mathematics, have, or shall have occasion for Instruments thereunto belonging, or Books to show the use of them, they may be furnished with all sorts, useful both for Sea or Land, either in Silver, Brass, or Wood, by Walter Hayes at the Cross-daggers in Moorfields, next Door to the Popes-head Tavern; where they may have all sorts of Maps, Globes, Sea-Plats, and Mathematical Paper, Carpenter's Rules, Post and Pocket-dyals' for any Latitude, Steel Letters, Figures, Signs, Planets, or Aspects, at reasonable Rates.