The M60s had cranks to manually elevate and traverse the turret and a plunger type generator to spark off the primer and fire the gun along with a bubble level and an optical gunners telescope along side the gun, the 105D I think.
The stereoscopic coincidence range finder worker manually too.
You had to compensate for cant and QE for ammo type with Kentucky windage, BOT, burst on target.
Course with no power the engagement would be a short one unless you got Ivan first...
This is more like it. Some basic “default.” Minimal capabilities to get you back to base safely if the systems are damaged.
The stereoscopic coincidence range finder worker manually too.
AAAACK! Geese in my rangefinder! Yep, the M60 and '60A1 had a combat engineer's 10-cap hand-twist *hellbox* as an nalternate means of touching off a 105 round's electric primer. And yep the steroscopic rangefinders were fairly manual-reliable, though mud splashes could shut them down pretty quick. In an M48, the old ,30 caliber coaxial M37 gun would hit to about the same place as a main gun riund out to about 1100-1200 meters, with the later M219 7.62mm coax in an M60, the range was more like 900 meters to coincide with the 105mm main gun.
I was amused as hell in 1973 to discover that the Israelis used the same technique with their old leftover WWII M1919A5 Browning MG's, rebarrelled to 7,62mm...and which they used at an even 1000 meters. When you saw the tracers bounce off the other guy's armor, !Yore