a 26 Ufe cf Convex Mirrors to Travellers. [Book III, 



vifible, erect, greater than hjmfelf, but walking to- 

 wards him, and diminifhing conftantly, till both object 

 and image me^t together in the reflecting furface. 



The pnenomena of convex fpeculums are different, 

 and in moft refpects oppofitc, to thofc of the concave 

 ipeculum. When a perfon looks in a convex fphe- 

 rical reflector, he fees an image of himfclf, erect, but 

 diminiflied As he walks towards the reflector, the. 

 image appears to walk towards him, oonftantly in- 

 creafing in magnitude, till they touch each other in 

 the refle&ing furface. 



From this property of diminifhing objects, fpherical 

 reflectors are in great requeit with all lovers of pic- 

 turefque fcenery. Small convex reflectors are made 

 in the mops for the ufe of travellers, who, when fa- 

 tigued by ftretching the eye to alps towering on alps, 

 can by their mirror bring thefe fublime objects into a 

 narrow compafs, and gratify the fight by pictures which 

 xthe art of man in vain attempts to imitate. 



