Caribbean Courtesy light

Posted by Walter Schoepf On 2014/6/13 6:16:57

On the courtesy light of the 1955 Caribbean there are 2 light bulb, one with 2 contacts and one with only 1 contact. My question is which one is at the top and which one is at the bottom of the unit?
Also, under what condition are both on and what makes only one light bulb come on?
Any information is appreciated,
Walter