Can someone eli5 why it would be so self evident that "no argument is ever required as to the need of a revolver at home, at the office, when traveling"?? They say it like it's apparent. Maybe at home you're worried about burglary, but what's going on at the office?
Of course it's apparent, this is America 120 years ago. You don't leave your house without your blazer, pipe, trench lighter, bowler hat, revolver, and buttplug (which is also a gun)
Hammerless was/is used to refer to revolvers without a exposed hammer to snag on things. Basically so you can take it out of you pocket faster. It would still technically have a hammer. Although other firearms designs use a striker mechanism instead of a traditional hammer.