Enter the Hallf of Heroes and go left. Enter the office with a dead guy hanging out of the window, and look left.

After the ambush, go into the right hand room where the soldiers came from. You will find it on a bench

Once you get to the two exhibits - go into The Battle of Wounded knee. Inside, on the right, is a staff store room. Go in and find the gear on a table.

Once you get to the two exhibits - go into The Boxer Rebellion. Inside, on the right, is a staff store room. Go in and find the gear on a table.

Pass by the statue and under the bridge (in the bright rooms). Lock pick the door. Enter the First Lady's exhibit, and search for a chair next to a fireplace. The Voxophone is on it.

After the courtyard fight, and you learn about tears, enter the building. Infront of you are two Kinetoscopes.

Next to Kinetoscope #19

Directly infront of #19 and #20 is the Gift Shop. Next to the counter is another Kinetoscope. (Note: You will also find this Kinetoscope just before you board the Zeppelin - which is a repeat.)

After the courtyard fights and you see the message he leaves on the wall (We deserve to die as soldiers), turn left and go into the room. There is a Voxophone in there.

After the second courtyard battle (you're on your way back), go into the room to the left of the message written on the wall infront of you. Infusion upgrade in that room.

As you reach the plaza, and before using the skyrail to get back to the ticketing office - you will find a shock jockey machine on the right. Use it and it will open a gate to where the snipers were before. Go up the stairs. On a table.

After you go past the ticketing office (left) and bar (right), you will enter the building and fight a patriot. Before leaving this area, go into the Employees only room where you went before. The turret is now friendly and a gear has been left for you.

Before leaving the yard outside the Hall of Heroes (just before using the Gondola to get to the Air Ship), use the Sky Rail to drop down onto an uncharged power device on the upper floor of the Hotel in the middle of the area. Use your new Shock Jockey on the device to open the door, and enter the building. The Voxophone is on the bed inside.

In the same room as Voxophone 33. Use the sky rail to enter the upper floor of the Hotel in the middle of the area outside the Hall of Heroes. Shock Jockey on the device to open the door.

Before leaving the yard outside the Hall of Heroes (just before using the Gondola to get to the Air Ship) go into the Toy Shop and use Shock Jockey to open hidden room.

As you board the Zeppelin, enter it, and go to the desk on the right before you set off. Find the infusion upgrade and some other stuff (money, etc).

At the beginning of the docks area, enter the delivery center on the left. The Voxophone is between two desks.

While in the docks, go into the Employees Only door on the far side. If you haven't already triggered a fight, taking the gear will do so.

After Elizabeth disappears through a tear. Go left and check the desks to find the Voxophone.

As you come across where Elizabeth is being held, you will be above a courtyard with two men in stockades. On the other side you will find some prison cells past a door. Inside on the floor, by the bars, is an upgrade.