There were a couple of the original (?) bulbs in one corner. I believe the projector dates from the late 1930s/ early 40s so these bulbs could be 70 or even 80 years old.
Property of HM Government. 115V 100W Siemens:
30V 100W Gas-filled Mazda BTH. Made in England;
Close up they really are quite wonderful:
I wanted to see if they would still light, but the original electrics look scary:
but then I read that collectors of old bulbs use low voltages to display the colours and shapes of the filaments so I connected up a a battery pack with 10 x 1.5V batteries in it:
and amazingly with the 15V they sprang to life! Beautiful:
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