A friend went off to a retired millwrights garage sale with high hopes, I'm not sure what treasures he returned with but he took a picture of these sadly neglected tools, sent it to me saying that everything below the hacksaw was a mystery to him. I'll throw it out here:
#1 looks like s multitool of some sort, possibly some sort of shoemakers hammer or hoof pick?
#2 This is a spring loaded device that the wheels rotate when squeezed.
#3 I believe this is a machinists tachometer. Update. How to use a speed indicator. https://www.youtube.com/watch?v=4RLnwgp6YcM