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Sorry my mistake - I didn't mean 10X. The minimum zoom with 0.5X Barlow is 3.5X, and max is 22.5X. The following is from the Amscope manual. The "normal" eyepieces are 10X/20, to give a working distance of 165mm and FOV of 57mm at 3.5X and 9mm at 22.5X. Occasionally I need higher magnification to look at a jewel or pivot. Rather than taking the Barlow off, I bought some 20X/10 eyepieces - much quicker to change than the Barlow, and you end up with the same magnification (though the image is darker). -
The Amphibia uses an armoured glass, that is, it has a metal ring on the inside around its circumference. If that ring is missing, it will fit but leak. The fact that you were able to push out the crystal using your fingers only tells me the metal ring was missing. It usually requires a crystal press or a very, very strong thumb and comes with pain in said thumb. Fitting a correct crystal w/o a crystal press is basically impossible. You can see me do it here! -
By TimepieceTinkerer · Posted
Spot on — I just checked and yep, one of the balance pivots is smashed on one side. That would definitely explain the issue. Appreciate you pointing me in the right direction! -
Yah, the Charles River Museum has a few of those old Waltham factory machines including a screw machine or two they fire up from time to time, though I've never seen it run. I think the American Precision Museum in Vermont has one too.... -
Need to see the pivots on the balance but my first guess would be one of the pivots.
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