On 14/01/2019 12:54, Scott wrote:
On Mon, 14 Jan 2019 08:12:54 +0100,
(D.M. Procida) wrote:

I bought a lightbulb (and a ceramic holder and rotary lightswitch) in a
second-hand shop yesterday. They had many beautiful items taken from an
old electronics teaching laboratory - all brass, steel, ceramic and
wood.

The lightbulb:
https://www.dropbox.com/s/qw0vnqdtvemf0ld/lightbulb.jpg?dl=0.

It's about 10cm tall, and has an Edison screw. The filament loops up and
down the bulb in six lengths. It's made by Osram, but there are o other
readable markings on it.

Any idea what the purpose of a lightbulb like this might be?

I'm tempted to run it at low voltage to see what it looks like
illuminated, but I'd hate to damage the filament.

Could it be for a cine film projector?

Unlikely. Projector lamps and theatre lamps the old T1 theatre lamp
Had a 3 inch or so glass gl;obe but a compcet filamjent of less than 1
inch square. I was using thesesat least until the 80's. The coimpace
filament was needed to be able to focus the light into a beam.

Malcolm

---
This email has been checked for viruses by AVG.
https://www.avg.com