Can you help identifying these lamps

[bionicmerlin]

I thought I should do the obvious thing .Try one . Although the voltage is 14 volt they are quite bright going down to 10 volt. Andy

[Glowing Bits!]

The first thing that entered my mind was airfield lighting, 14V is common as is 28V but the bayonet cap suggests otherwise.

[broadgage]

Originally Posted by Radio Wrangler

Christmas trees of an appropriate size? Festive strings?

David

Possibly, but not that likely in my view. The bulbs are not very decorative due to the glass bulb being small in relation to the cap and therefore the lamp holder.
Christmas or other decoration bulbs of about the bulb size illustrated usually have smaller caps such as SBC or SES.

That is what made me think of military or wartime civilian use. Such as interior lighting of a bus or railway carriage. Would have to be BC to be a drop in replacement for the peacetime 12/14 volt 20 watt lamps.

[Heatercathodeshort]

Gerry used to have a large wooden drawer labelled 'Nasty Bulbs'! It contained all sorts of odd bases, sizes, shapes, colours and voltages. It was fascinating to sort through.

There must have been thousands more for all special needs. My guess is advertising sign, the letters picked out by the small bulbs. John.

[Brigham]

They are identical in appearance to ordinary coloured sign lamps.

The voltage is the oddity. Most shop/theatre signs are 240v.

It isn't usual to run them in series strings, for the obvious reason that the whole sign goes out when one lamp fails.

Fourteen volts is suspiciously like what you might find across a nominal 12v. lead-acid accumulator when on charge...

[bionicmerlin]

I thought someone would know straight away and this would be a simple challenge. Some good ideas but know one knows for sure . Andy

[Graham G3ZVT]

Carnival parade float festoons would be my guess.