When ever you want to!
Use the glider you got from Leonardo da Vinci.
It is just a costume, on the island at 831 AD (2 o'clock on the time device). The only way to get it is to use the Glider Wings from Leonardo Da Vinci (4 o'clock 1516 AD).
No. However, some of the items are easier to get with the Glider Wings. Unfortunately, you can't use them in 1516 AD because you get them for solving that time. And you can't use them in 1882 AD because that's where Leonardo's notebook is.
It is at 831 AD (2 o'clock on the time device),on the island with the Vikings. It does not have any use in the game. It is only a costume. To get it you need the Glider Wings from Leonardo Da Vinci (4 o'clock, 1516 AD).
You can only use them on that island. The same applies to the jetpack and glow stick on Early Poptropica, and the flying power on Super Power Island. They do not work on any other island. The cell phone costumizer feature does work on any island.
No, anything not connected with the island quest is purely decorative.
To reach the high ledge in Leonardo's workshop on Time Tangled Island, you need to use the glider placed next to the ledge. Pick up the glider and use it to soar up to the ledge where the Leonardo's leather book is located.
Use the time device to return to the Lab again and use the blimp to travel to other islands.
Go to your inventory, and then click "use"
On Time-Tangled Island in the game "Putt-Putt Travels Through Time," the phonograph is located in the 1920s section of the island. You can find it in the park area, where it plays music when you interact with it. To progress in the game, you need to use the phonograph to help restore the timeline.
Once you have your Island Medallion, simply use the time device again to go to Pendulum's Lab (12 o'clock).
Use the Lab setting on the time device, just as you did to get to the restored future.