6x9 slide projector?

I still have a bunch of old Gepe 6x7 plastic mounts with AntiNewton glass in them; that's the largest size I've seen. Cardboard mounts wouldn't hold still larger film sufficiently flat for ideal projection; I have handled those. And the cardboard would have to somehow be fireproofed. Big projectors get hot.

GregY said:

Just a thought, cardboard mounts, weren't necessarily created so you could project a slide.....but for easy handling viewing them on an editor's light table.

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The Blaire cardboard mounts cost 25¢ which allowed me to mount all the 6x7 frames that I didn't mount in a Gepi AN mount for projection. The cardboard was of high quality- 90 point or something- and there was a dimple on one side so that by touch you would know which was the projection side. Held up well under projection even when positioned in front of the bulb for extended periods as I have a tendency to do. The only negative is that the sealant glue would dry out after a number of years and would have to be renewed. Mine are still going after 20+ years of use.

A few years ago at an estate sale, I picked up a bunch of photo equipment - mostly darkroom odds and ends but also a box of glass slides of national parks. I needed to find something to project them and happened on a boardroom projector of probably 1950's vintage that would do up to 3x4 inch slides. It was a high quality corporate grade American Optical projector in a nice metal case with 5 lenses (Spencer, B&L etc) of different lengths and several bulbs of different wattage to match the length of the lenses and a couple of slide carriers. It was perfect for the slides I had and I figured I could glass mount my 6x9 transparencies too if I wanted. Never got around to that then but thinking about it now I just might. Oh, it cost me $40. I just looked on eBay and saw a simple Besseler one for $25 and a couple of AO's that were probably WWII training vintage that were $45.