INTRODUCTION. k 



de la Nature of the Abbe Vertot. But the prefent one was 

 conflructed upon my own principles ; I intruded the execu- 

 tion of the glafles to MefTrs Nairne and Blunt, Mathematical 

 inftrument-makers oppofite to the Exchange, whom I had 

 ufually employed upon fuch occaiions, and with whofe ca- 

 pacity and fidelity I had, after frequent trials, the greatefc 

 reafon to be fatisfied. 



This, when finifhed, became a large and expensive inflru- 

 ment; butbeingfeparatedintotwopieces, the top and bottom, 

 and folding compactly with hinges, was neither heavy, cum- 

 berfome, nor inconvenient, and the charge incurred by the ad- 

 ditions and alterations was confiderably more than compen- 

 fated by the advantages which accrued from them. Its body 

 was an hexagon of fix-feet diameter, with a conical top ; in 

 this, as in a fummer-houfe, the draughtfman fat unfeen, and 

 performed his drawing. There is now, I fee, one carried as 

 a (how about the Itreets, of nearly the fame dimenfions, 

 called a Delineator, made on the fame principles, and feems 

 to be an exact imitation of mine. 



By means of this inrtrument, a perfon of but a moderate 

 -fkill in drawing, but habituated to the effect of it, could do 

 more work, and in a better tafte, whilft executing views of 

 ruined architecture, in one hour, than the readiefc draughtf- 

 man, fo unaflifled, could do in feven ; for, with proper care, 

 patience, and attention, not only the elevation, and every 

 part of it, is taken with the utmofl truth and jufleft propor- 

 tion, but the light and fhade, the actual breaches as they 

 Hand, vignettes, or little ornamental ffirubs, which generally 

 hang from and adorn the projections and edges of the feveral 

 members, are finely exprelled, and beautiful lcflbns given, 



Vol. I. u how 



