http://i.imgur.com/eGQoC.jpg

Multiple rocket launcher?

http://www.members.tripod.com/chip2500/1c427150.gif

Rocket launchers according to this diagram


http://www.albentley-drawings.com/images/262ACTWY.jpg

You'll need to blow it up


taken from
Me262 (http://www.albentley-drawings.com/me262.htm)

Its a (wooden) launch rack for R4M unguided missiles - the grand-daddy of the Mighty Mouse series of a/a missiles fielded by the USAF in the fifties

where is the photo taken? which museum?

Munich Technical Museum.

Apparently there were 1,430 Me262 (http://en.wikipedia.org/wiki/Messerschmitt_Me_262)s built.

The Me 262 was found to have advantages over the early models of the Gloster Meteor.
It was faster, had better cockpit visibility to the sides and rear (mostly due to the canopy frame and the discolouration caused by the plastics used in the Meteor's construction), and was a superior gun platform,