This fashionable accessory for young ladies was used for many different reasons. A woman could wear it as a bracelet when she was going out and if a gentleman presented her with flowers, she could secure them on the device with a special holder and continue dancing.
I've sung all my life; I especially love 16-century choir music and plainsong (Gregorian) chant. But I had never seen anything like the knives in #19. Note the older music script, which is no longer in use, but which some people find easier to read.
#3 I believe that in the US, a majority of people had dryers by the 60s, and that by the 70s, very few people did not have them.
#14, "woolen socks", perhaps and I have toes on my feet, not sure about Romans though.
#15 Now why would they be reading multiple books at once???