on machinarium once out of prison, you will find the arrow puzzle to lift up to the top of a huge burden. This solution is very easy.
let’s look at the problem in the picture
there are 6 pieces arrows, 3 face down and 3 face-up, you must move the position up to 3 arrows facing downward scroll at the bottom, and vice versa with 3 arrows facing upward.
this is the sequence
after this you need to push the big load back to the position before, so you can lift up to control room, on control room you must shift the oil drum approach to the dog, and press oil button to lure the dog out of its hiding. And grab the dog with tool that you have on inventory.
obtained after the dog, give it to the woman holding the umbrella, she will provide the umbrella for you, so you can pass through the water-soaked streets using the umbrella.