Looking for photographs/diagrams of early pickup tube

[Rinehart]

Does anyone have any pictures or diagrams of early iconoscope tubes that used two-sided scanning targets? I am writing a book on early television for a general, non-technical readership and I would like to have an illustration of one to compare with a single-sided target. If it gets published at all it won't be for many years, so I don't think copyright is an issue right now. However I have a number of people who have agreed to read the various drafts as I write them, so I would like to have illustrations if I can get them.