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- Computer — 2023-10-09 23:40:16
…alculated mechanically, removing human sources of error. He first discussed the principles of a calculating engine in a letter to Sir Humphry Davy in 1822. ===Difference Engine=== The 1820s saw Babbage work on his '**Difference Engine**', a mac…
- Telegraph — 2023-09-23 15:56:52
… laid eight miles of wire insulated in glass tubing in his garden and connected both ends to two clocks marked with the letters of the alphabet. {{Image url="RonaldsTelegraph.jpg" class="left" title="Ronalds Telegraph" width="300" }} Static elect…
…and Charles Wheatstone. It was beautifully simple using electromagnetism to turn five needles left or right to point to letters. This meant anyone could read the message being sent, no need for anyone to be trained in understanding codes, unlike… - Postage Stamp — 2021-11-06 16:32:56
…**1840**, for official use from 6 May of that year. {{{Toc}}} ::c:: == The Penny Black == Prior to the **Penny Black** letters were paid for by the recipient. Postage was only available to the wealthy and many letters were returned if the recei…
- Salicylic acid — 2021-08-08 18:32:13
…pplying it; and that this might be the intention of Providence here, I must own, had some little weight with me". == A Letter == On April 25, 1763, Reverend Stone wrote to George Parker, second earl of Macclesfield, and president of the **Royal …
…Society** in a letter read before the Royal Society on June 2, 1763, describing the use of dried willow bark as a remedy for fevers and agues… - Eraser — 2020-08-18 10:06:20
… on the other end of a pencil. He patented his invention on March 30, 1858. {{Tag ids="pencil eraser graphite writing letter "}}…
- Rubber Band — 2020-06-28 12:40:44
…holding lids on to holding clothing in place. Golf balls to catapults and what would the postman use to hold all those letters together before discarding outside your front door?…
- Pound Sterling — 2016-05-31 15:19:41
… for weight or balance, via the construction //Libra Pondo//, meaning a pound weight. The **'£'** symbol, is an ornate letter **'L'**, and the abbreviation for the unit of mass, lb (pound) because its value originally equated to the price of a p…
