Morse Code
In the Telegraph chapter, you will be tasked with sending a Morse code. Figuring out the code is difficult, so here is the solution to make things a little easier. Hold down the lever for roughly one second, release it and then hold it down again for the same amount of time. Wait a few seconds and then repeat this process again, but add one more hold to the end of the sequence. After a few seconds of waiting, tap the lever, hold it for a second and then tap it again. Take another momentary break and then tap the lever three times in a row. Stop for a few seconds and then tap the lever once more. You have just spelled the word "Morse," completing the puzzle.
Cover the Window
As soon as you have collected the nails and the plank, you have everything you need in the Camera Obscura chapter. Go to the main scene and place the paper on the right wall's window. Trace the outline of the window with the coal and mix the paper with the wood to created carved board. Use the hammer and nails to attach the carved board to the window and put a hole in it with the drill.
Conduct Electricity
Head to the main scene of the Electrical Conductivity chapter when you have taken the items from the box. Cut the wire on the right of the carriage with the pincers and grab the cut wire. Place the winch on the post and attach the kite string to the winch. The metal walking stick goes into the ground, left of the winch. Place the key and the wire directly above the walking stick.
Submarine Barrel
Once you have collected the items in the crate in the Submarine chapter, go over to the main scene. There is small hole in front of the barrel; place the propeller here. The weights go on the left of the barrel and the item named Sub Head goes on top. Click on the left side of Sub Head to position the oar. It is actually going on the back of the barrel, but this is the only way to place it since the back of the barrel is not visible.