Solar was the brand line of enlargers sold by Burke & James. I don't know whether B&J actually manufactured these enlargers themselves or simply purchased and branded them, as they did with many of their other products.
From what I've seen, I put these in the same category with Federal: they were low to mid-level enlargers aimed largely at amateurs who worked at home and needed a solid machine but couldn't afford the quality stuff.
I've never seen a Solar enlarger. In fact it wasn't until I began collecting old photo magazines that I became aware of them at all.
|120||USA||Late 1940s thru 1960s||2-¼ x 3-¼"||22 x 25"||Adjustable double condensers||Rack & pinion||No||Single post||2, 3|
|35mm||USA||Early 1960s||35mm||22 x 25"||Double condenser||Rack & pinion||No||Single post||1|
|45C||USA||Late 1940s||4x5"||n/a||Double condenser||Rack & pinion||No||Single post||2|
|45C Press Autofocus||USA||Late 1940s||4x5"||n/a||Double condenser||Bellows||Yes||Single post||2|
|45 CR||USA||1960s||4x5"||20 x 27||Double condenser||Rack & pinion||No||Single post||3|
|45 DR||USA||1960s||4x5"||20 x 27||Diffusion||Rack & pinion||No||Single post||3|
|45QL||USA||Late 1940s||4x5"||n/a||Double condenser||Rack & pinion||No||Single post||2|
|57||USA||Late 1940s||5x7"||n/a||Diffusion with light equalizers||Rack & pinion||No||Single post||2|
|57HC||USA||Late 1940s||5x7"||n/a||Double condensers||Rack & pinion||No||Single post||2|
|Auto II—120||USA||Late 1940s||2-¼ x 3-¼"||n/a||Adjustable condensers||Bellows||Yes||Single post||2|
|Auto 66||USA||Late 1940s||2-¼ x 2-¼"||n/a||Double condenser||Bellows||Yes||Single post||2|
|Solarmatic 120||USA||Late 1940s thru 1960s||2-¼ x 3-¼"||22 x 27||Double condensers||Rack & pinion||No||Single post, parallelogram||3|