...can a revolver that old shoot modern ammo? ones a 22 long and the others a 32?
Asides from the black powder vs. smokeless problem brought up by the other posters...
There's a variety of .32-caliber cartridges that were used during this time period. Whether they're practical to shoot depends on which specific one is needed.
.32 S&W Long is not stocked by most large sporting goods stores but is readily available for reasonable prices by mail order. .32 Colt New Police is the same exact cartridge. (Colt didn't like putting their archrival's name on their guns.
)
.32 S&W is moderately difficult to find and runs expensive, but it's available if you really want it, and it's readily reloadable. .32 H&R and .32 Merwin Hulbert are basically the same thing.
Beyond these, things get tricky.
.32 Short Colt is obsolescent but is supposedly still sporadically produced by Winchester; however, availability is spotty at best.
.32 Long Colt has been out of production for a couple of decades but can apparently still be found at some gun shows, and guns chambered for this cartridge can fire .32 Short Colt. However, both of these cartridges use outside-lubricated hollow-base heeled bullets like .22LR, so reloading is an iffy proposition unless you have special tools.
Other .32-caliber cartridges, including the myriad varieties of
.32 Rimfire, are obsolete and basically unavailable. IIRC the last known batch of .32 Rimfire was produced about a decade ago but was rapidly snapped up by people who mostly aren't willing to part with it.
Regarding the .22 revolver, .22
Long (not Long
Rifle) is an odd chambering for a revolver, but you run into some odd stuff from this era.
However, most .22 revolvers have the chambers bored straight through, so .22LR can physically be loaded into many .22 Short or .22 Long revolvers. The reason this is a problem is that smokeless .22LR loads may damage the forcing cone of a black powder .22 Short or .22 Long revolver, and since black powder .22 ammo hasn't been available since before WWII IIRC, chances are good that an ignorant shooter may have fired enough modern ammo to damage the gun well beyond any practical chance of repair.
There are many junk pistols over a hundred years old that are worthless, not to mention unsafe. If I were you I would pass.
+1 to both. Unfortunately, many 19th-century revolvers really weren't safe to fire
when they were new. 112+ years later, all bets are off.