I quickly consulted my photography book that says that ambrotype was patented in 1854 by James Ambrose and became very popular after that. Like the degarrotype, each image was unique - no negative. The degerrotype was pre - ambrotype. SAXBURY@aol.com wrote: > > In a message dated 1/29/00 12:14:24 PM, eminer@HILINE.NET writes: > > << even some ambrotypes.(the ones on glass) >> > > Does anyone know what time period these are from? My grandfather just > received over 200 pictures from a family member and along with some tintypes > he has several of the ones on glass. > > Thanks, > Barbara