How about a sports almanac showing the outcome of all games from 1890 to, say, 1950? Worked for Back to the Future 2. This was the age of Tesla and Edison and rampant cut-throat capitalism, so money rules. Need to take something that will allow you make a fortune or two... and not lose it in stock market crash. How about a Handbook of Chemistry and Physics? Okay, that's it: two books, printed on non-acid, archive-quality paper.
1890 is a bit late for witch burning in most of the civilized parts of the world.
But I agree on the technology bit. Sorta.
Along with the sports almanac I would take a book describing the inventions of the 20th century and use my betting proceeds to fund an industrial scale R&D company.
One of the ethical problems your face is that you know when wars were going to break out. Do you interfere? Or do you set up somewhere safe (a secret Antarctic base perhaps?)
I wanna be Daddy Warbucks when war breaks out! Sell arms and ammunition to BOTH sides! Maybe run a little rum on the side like Kennedy did. Buy me a whole bunch of honest politicians. (Honest politicians stay bought -- Robert Anson Heinlein) But most of all, I just wanna have FUN! I am already aware of most of the inventions from 1890 onward. Won't Edison be surprised when I patent the vinyl record disk while he his still foolin' around with wax cylinders! Umm... gotta invent vinyl first. I wonder if that Handbook of Chemistry and Physics will help with that?
Aren't you going to have a problem finding a 120VAC power source, or even a 9VDC battery in 1890?
You'd be using them as a boat anchor and paperweight.
Us time travelers gotta be creative and quick on our feet. Some martial arts and weapons training might be appropriate before departing on this adventure. Light weight, too!
Well maybe yes but the location is not mentioned anywhere so i guess even the sports almanac may not be of any use. Same goes for the Oscope if you have no utility power.
A battery is easy, an array of lead plates and acid, huge amounts of power to work with, wind your own motors, lots of metals to work with, ac generation is possible inductor/capacitor (two metal plates) how did tesla do it?
Hydro power and 240v motors (wind your own), light bulbs, with a furnace is it not possible to create a transistor i seem to recal crude transistors are possible?
What satellites would it find to triangulate your position? A navigation system a gyroscope and mecanical system like the one to get to the moon or fly aircraft before gps
Knowledge and skills are the only reliable things you can take back to 1890. Well, maybe a good anvil and steel hammer if you want to ply a blacksmith trade. Plenty of horses in 1890 that need new shoes, and a forge is pretty easy to make. Maybe need a wheeled cart for the anvil, depending on where you arrived and how strong you are.
antibiotics and basic medical training encyclopaedia... those guys didn't even have penicillin and making all the generators and crap I would surely get a cut or 2 somewhere