This is an example of a brass and glass pocket telescope from London. It measures around 7″ when extended. For source and more details, click here.
Image from: http://www.nps.gov/history/museum/exhibits/revwar/image_gal/vafoimg/frameshell.html
This is an example of a brass and glass pocket telescope from London. It measures around 7″ when extended. For source and more details, click here.
Image from: http://www.nps.gov/history/museum/exhibits/revwar/image_gal/vafoimg/frameshell.html