Regularjoe, all three objectives are marked Betz and there is no mark on the condenser lens/diaphragm. When fully extended, that’s with the objectives raised to max height and the “draw tube” also, the height to the top of the eyepiece is appx. 16 inches.
Here is a web pic of a 1910 Bausch & Lomb and which mine will hopefully look similar to iffen I get it shined up, ……. except the “draw tube” on mine is chromed. And I’ve been looking on the web and still haven’t found a value$ for it.
And no, no, Tales, that microscope goes back under that bell jar once it gets all spiffied up.