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 PREFACE. oberving o to place the Plan below, and the Upright on one ide of your neat Draught, that your Drawing-Square may command each of them; which will mightily horten your Work.

V. the Author's Advice of taking the Figures in coure, be trictly follow'd in the Practice; which will be a great means to render the Whole eay and pleaant.

This is the Sum of what we thought mot proper to advertie you; and have only this farther to requet, That if any Mitakes may have ecap'd the Pres undicover'd, as we well hope there are few or none, you will favourably correct and pardon them. MONITA