Answer:
Joseph Swan began working on a lamp using carbonized paper filaments, while Thomas Edison initially attempted to use metallic filaments.
Explanation:
Several names are mentioned when it comes to the research that involves the development of the lamp, but the most outstanding ones, because they made commercialization possible, were the British physicist and chemist Joseph Swan and Thomas Alva Edison.
In 1850 Swan began working on a lamp using carbonized paper filaments in an evacuated glass bulb. In 1860 he was able to demonstrate a working device, and obtained a British patent partial vacuum coating, carbon filament incandescent lamp. However, lack of a good vacuum and an adequate electric source resulted in an efficient light bulb with a short shelf life.
On the other hand, Edison initially tried to use metallic filaments. It took enormous investment and thousands of attempts to discover the ideal filament: a partially charred cotton thread. Installed in a vacuum glass bulb, it was heated with the passage of the electric current until it became incandescent, without melting, sublimating or burning. In 1879, a lamp so constructed shone for 48 continuous hours, and at the end of the year celebrations, a whole street, next to the laboratory, was lit for public demonstration. A few years have passed and Thomas Edison, before being able to make the idea of the lamp work, admitted that he had created 100 wrong ways to build a light bulb.
Answer:
you have a right to ask your GP for a host of free tests and services that allow you to assess many aspects of your general health, reports Christine Doyle. ... The obesity epidemic is apparent in every town and many GPs are now ... checks and services which patients are entitled to request from their GP.
Explanation:
You'll be invited for a free NHS Health Check every 5 years if you're between 40 and 74 years of age and do not already have heart disease, stroke, diabetes, kidney disease or high blood pressure. If you're registered with a GP surgery that offers the NHS Health Check, you should automatically get an invitation.
Answer:
Explanation:
How does this passage reflect an important
cultural viewpoint common in ancient Greek
society?How does this passage reflect an important
cultural viewpoint common in ancient Greek
society?
<span> it is called a soliloquy </span>
The answer is D. Residence