[Fiddlstix]

Gee, an 'observation dome'. We used to have those on the passenger trains....
(For those of us old enough to remember)

[headstamp 2]

http://www.cnn.com/2015/12/14/aviation/windspeed-skydeck-seats-on-top-of-aircraft/

How many can they install per plane and how much does it weaken the fuselage?

[sparklite2]

I remember riding on steam engine passenger trains in the forties. When the engine first started pulling, there was still slack in all the couplings. You could hear the snaps coming from cars nearer the engine as, one by one, their couplers pulled taut. Then, bang, you got yours, and began a slow roll. From some reason, diesels just start rolling.

[Osage Orange]

They still have them.............

[Oztrich Boy]

Aircraft had them in the 1930s