This one has just landed here. Marked AB 21 so 1937. I do like these little lanterns. This one has been modified with a cut down and re drilled pricker rod to take a 250 Petromax pricker needle and has a Petromax 200 jet fitted. I have got the parts to convert it back but it works very well as it is so it stays for now. I measured the light after some serious pumping and got it to register between 200 and 209 cp. Not often you get a 75 year old lamp to perform as new. ::Neil::
What a nice lamp Neil. GZ It looks almost like the AB-print comes out of the lamp and not stamped in the lamp - is that the photo cheating my eye or is it so?. Claus C
Wery nice lantern indeed! How do you measure CP by the way? I know there is some tools that measure light by lux or something, but I have never heard of a CP tool.
Yes the image of the AB surprised me as well. Looks perfectly normal on the lamp but almost 3D in the picture. I have no idea why though. I have zero interest in photography so I have no undestanding of what might have happened. I measure light with a photometer. Basically it is a Lux meter mounted in a tube which reads directly in cp when the light is 1 metre from the lux meter head. I am sure there is a thread somewhere on the site which shows this instrument. Maybe someone smarter than me can find it. ::Neil::
Here´s one old topic on the subject. I think there's others, but this one might be the one you are referring to.
Yes I knew there was a topic where I had illustrated the photometer I made. Not a cheap thing to make mainly because Lux meters are not cheap and in truth the beast does not get used much now. It taught me a lot about how pressure lamps perform and how they mostly fail to give more than two thirds of their rated power. Good for a laugh though when I trot it out at Newark and measure lamps rated at 200 cp giving a blinding 5cp. ::Neil::
