Testing 50 Year Old Vintage GM T-3 Headlights

T-3 headlights were original equipment on all General Motors cars between 1960-1967.
I've been holding these T-3 sealed beam lights for over 30 years. It was time to move them but I needed to see if they still worked. By applying power to the leads, the bulb will light up, but if the seal is bad, air will be allowed into the unit, burning it out.