"Level Of Egault Middle 19th Century London"
Égault level, comprising a toric level secured to the main axis and two stirrups, on which a removable sighting telescope rests. The assembly can rotate 200 gon around the main axis to carry out a second aim. Around 1850, surveyor's object in nickel-plated metal and brass, marked: Baker, 245 High Holborn, London Note a crack from use on the first upper tube. 
Le Magazine de PROANTIC
TRÉSORS Magazine
Rivista Artiquariato