夜間照明に要する費用の劇的な推移

一部引用



The Cost Of Light Through The Ages



One hour of light (referred to as the quantity of light shed by a 100 watt bulb in one hour) cost 3200 times as much in 1800 in England than it does today, amounting to 130 euros back then (or a little more than 150 dollars).

In 1900, it still cost 4 euros (close to 5 dollars).

In the year 2000, we arrived at a cost of 4 euro cents (5 U.S. cents).

You can also put this into relation with the amount of time that an average worker needed to labor during different ages in order to earn enough for the 100 watt bulb to glow for an hour - just like the economist William Nordhaus has done in one of his classic essays.

The people of Babylon, in 1750 B.C., who used sesame oil to light the lamps, had to work for 400 hours to produce the said amount of light.

Around 1800, using talcum candles, 50 hours needed to be invested.

Using a gas lamp in the late 19th century, 3 hours were due.

Using an energy saving bulb today, you will have to work for the blink of an eye - a second.



20170808_light.jpg


Ref: http://www.zerohedge.com/news/2017-08-06/cost-light-through-ages



(2017-08-08)
関連記事

コメントの投稿

非公開コメント

プロフィール

横着者 (ご連絡はコメント欄にて)

Author:横着者 (ご連絡はコメント欄にて)

最新記事
最新コメント
最新トラックバック
月別アーカイブ
カテゴリ
検索フォーム
RSSリンクの表示
リンク
ブロとも申請フォーム

この人とブロともになる

QRコード
QR