answersLogoWhite

0

I am a retired 74 year old electrician, plumber,& hvac mechanic. This is not a one answer question. I helped my dad wire houses when I was 12 years old. This is an easy question to answer. Polarized plugs actually came out in 1914. They were never well accepted, so, here is what I can tell you. If you have an old lamp pay more attention to the cord and the socket. When polarized plugs and the pole plugs finally became acceptable to the public, the electric companies made three prong adapters available. Simply because, most homes only had two prong receptacles. So that people merely cut off the plug and replaced it with a two prong plug, so, you are finding Bakelite plugs with no cover cap on them. Here is what to look for. To date your lamp or appliance. Asbestos or cloth covered cords ended in the early 50's. Bakelite plugs ended about the same time, then we grew into the molded cords. If your cord is stiff composite of rubber and plastic it ended in the mid 50's. If it is a clear wire it ended in the 60's. Also look at your socket. If it is porcelain it could have ended in the 40's or 50's as well as many of them being Bakelite. I can't continue beyond that because at that point repros are being made and we are not interested at this point in modern lighting's another thing to look at in your old light, does it have a ground wire? if it does it is mid 20th century and not antique.

User Avatar

Wiki User

13y ago

What else can I help you with?

Related Questions

Are all ray bans polarized?

No, not all Ray-Ban sunglasses come with polarized lenses. Ray-Ban offers a range of sunglass options, including both polarized and non-polarized models. Customers can choose the type of lens that best fits their needs and preferences.


Are the oakley flak jackets polarized?

Not all pairs are. You have to buy Polarized lenses for them to be polarized.


Is an SCR polarized?

is s.c.r polarized


Can a laser be polarized?

Yes, they are almost always polarized.


How can you separate the polarid and unpolarid sunglasses in the market?

To separate polarized and non-polarized sunglasses in the market, look for labels or tags indicating polarization, as polarized lenses typically reduce glare and improve visibility. You can also perform a simple test: wear the sunglasses and look at a reflective surface, like water or a car hood; if the glare is significantly reduced when tilting the glasses, they are likely polarized. Additionally, polarized sunglasses often come with a higher price point due to their advanced lens technology.


When was Kaenon Polarized created?

Kaenon Polarized was created in 2001.


Light that has passed through a polarizing filter is called?

polarized light


What are GPL lenses are they polarized?

In reference to Ray-Ban sunglasses, their GPL lenses are polarized. The GPL stands for Glass Polarized Lens.


Do E3 spark plugs come pregapped?

Yes they already come pregapped.


Are g15 xlt lenses polarized?

No. Polarized cost about $100 more.


What is light passed through a polarized filter?

Such light is said to be polarized.


If you have polarized Oakley half jackets can you put non polarized lenses in the same frames?

Yep. No difference in lenses except for the polarized coating.