"flybywire" wrote in message
...
cant say i have noticed the glass dome on the top before what's it for ?

Fairly standard. It's the navigator's dome and there is usually a compact
sextant mounted in it for celestial navigation.
--
Andrew Chaplin
SIT MIHI GLADIUS SICUT SANCTO MARTINO
(If you're going to e-mail me, you'll have to get "yourfinger." out.)