What's this out of? Brass cup about 2" diameter, porcelain ring inside, half filled with strange flaky powder with shiny specks of mica in it. There's another two of them in the unit. Over a century old.
- Thread starter Lucien Nunes
- Start date
Pass. Powder to absorb arching maybe. Some sort of dimmer device.
No it's standing on a steel surface-table in the engineering shop. But post #2 got it already. It's part of a dimmer, or more accurately 'Martin's regulator'. It works like a carbon pile or carbon granule mic, with three of these cups of powder in a stack. As you turn the screw it compresses contacts either side of the layer of powder, reducing its resistance. According to the 1907 patent, the powder contains carbon, mica and sand. As the pressure is relieved, the springy mica flakes separate the carbon granules so that the resistance varies smoothly.
This one looks like it was a salesman's sample or demo unit as it has a little ivorine label on the pattress showing its recommended applications. I tested it, the resistance variation isn't very smooth but I think some of the powder has been lost through it being taken apart in the past so it's not a fair test. I doubt many modern dimmers would work at all after 100 years though.
This one looks like it was a salesman's sample or demo unit as it has a little ivorine label on the pattress showing its recommended applications. I tested it, the resistance variation isn't very smooth but I think some of the powder has been lost through it being taken apart in the past so it's not a fair test. I doubt many modern dimmers would work at all after 100 years though.
Yes one day we need to get a set of servants bell equipment for the 'non-electrical' comparison section. I have a variety of pushes, bells and a couple of annunciator boards, but not the mechanical variety to compare with.
I recently saw a very large annunciator with windows for more or less every room in the house, even the 'Maids Bath' had a bell push.
I recently saw a very large annunciator with windows for more or less every room in the house, even the 'Maids Bath' had a bell push.
R
R G
If I can get back there I will speak to the owner and see if I can remove some of the bits for you , I used to see loads of bit years ago , lots in the West London area , I came across an old board that had a contactor setup with 2 mercury tube that hinged with contacts at each end and in the middle , with hindsight I wish I had kept it now ...
Some of the old enunciator panels were nice with a mechanical setup and a large battery to one side that rung the bell ,the flaps had a switch that made and the bell rung ...
Some of the old enunciator panels were nice with a mechanical setup and a large battery to one side that rung the bell ,the flaps had a switch that made and the bell rung ...
P
PEG
Nice feature,Lucien,and a refreshing change from the shed RCD carry-on....
...As for the Maids' bell push,fairly standard round here,indeed,my three maids have one each...
Cheers :icon12:
OK, so what if there's only one maid, and she's in the bath. She pushes her own button, what happens next? Who gets the ding-dong?
Indeed, pressing the maid's button too much can land you in hot water. Or as someone phrased it the other day, ho****er. < see what I did there?
Now on a more electrical note, who under the age of 25 can answer me this: What's a 50 C.P. metal lamp (as shown on that little label?)
Now on a more electrical note, who under the age of 25 can answer me this: What's a 50 C.P. metal lamp (as shown on that little label?)
B
Barry White
Ive heard tales
mg_smile: that maids often pushed there own buttons.ps I am over 50 and still had to think hard about the 50 CP
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I came up with a Ronny Barker at 4s 9d although you got a better deal at 7d for 16 CP
Yes, and they said 'metal lamp' because at that time tungsten was not the only metallic filament in use. It was the opposite of carbon lamp which was standard and much less efficient. Because lamps were sold by C.P. output, not by power consumption in watts, the dimmer was given one C.P. rating for metal filaments and one for carbon, which corresponded to the same circuit wattage of around 60W.
If you look at a lamp of that age you will often find the rating given in the form 230-16, meaning 230V 16 C.P.
If you look at a lamp of that age you will often find the rating given in the form 230-16, meaning 230V 16 C.P.
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