Reading lens reflections to determine type.

[andarc]

I am still not clear how to read some lens reflections. I purchased a no-name brass lens from circa 1900. When I shine a light on a group (half the lens) I see one large bright reflection and one much smaller bright reflection. Does anyone know how to interpret this? Thanks.

 

[domaz]

Probably easier to partially disassemble the lens to see what the configuration is. I.e. if it has a cemented doublet and an airspaced pair then it's a petzval (I think) etc etc..