BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//archive.cryptologicfoundation.org//NONSGML kigkonsult.se iCalcrea
 tor 2.30.10//
CALSCALE:GREGORIAN
METHOD:PUBLISH
UID:c3e19598-0d63-40de-8ab1-200a4e63c3aa
X-WR-CALDESC:6 February 1802: Sir Charles Wheatstone\, inventor of the Play
 fair cipher\, was born. \n\nExcerpt from Encyclopedia Britannica: Sir Char
 les Wheatstone was an English physicist who popularized the Wheatstone bri
 dge\, a device that accurately measured electrical resistance and became w
 idely used in laboratories.\n\nWheatstone was appointed professor of exper
 imental philosophy at King’s College\, London\, in 1834\, the same year th
 at he used a revolving mirror in an experiment to measure the speed of ele
 ctricity in a conductor. The same revolving mirror\, by his suggestion\, w
 as later used in measurements of the speed of light. Three years later\, w
 ith Sir William Fothergill Cooke of England\, he patented an early telegra
 ph. In 1843\, he brought to notice the Wheatstone bridge\, a device invent
 ed by British mathematician Samuel Christie.\n\nHis own inventions include
  the concertina\, a type of small accordion\, and the stereoscope\, a devi
 ce for observing pictures in three dimensions still used in viewing X-rays
  and aerial photographs. He initiated the use of electromagnets in electri
 c generators and invented the Playfair cipher\, which is based on substitu
 ting different pairs of letters for paired letters in the message. He was 
 knighted in 1868.\n
X-WR-RELCALID:b28b62251d0f124528bbade79a5cb271
X-WR-TIMEZONE:America/New_York
BEGIN:VTIMEZONE
TZID:America/New_York
BEGIN:STANDARD
TZNAME:EST
DTSTART:20251102T020000
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
RDATE:20261101T020000
END:STANDARD
BEGIN:DAYLIGHT
TZNAME:EDT
DTSTART:20250309T020000
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
RDATE:20260308T020000
RDATE:20270314T020000
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
UID:02c70640-4443-4325-b368-f11d1f9689bf
DTSTAMP:20260424T093530Z
DESCRIPTION:6 February 1802: Sir Charles Wheatstone\, inventor of the Playf
 air cipher\, was born. \n\nExcerpt from Encyclopedia Britannica: Sir Charl
 es Wheatstone was an English physicist who popularized the Wheatstone brid
 ge\, a device that accurately measured electrical resistance and became wi
 dely used in laboratories.\n\nWheatstone was appointed professor of experi
 mental philosophy at King’s College\, London\, in 1834\, the same year tha
 t he used a revolving mirror in an experiment to measure the speed of elec
 tricity in a conductor. The same revolving mirror\, by his suggestion\, wa
 s later used in measurements of the speed of light. Three years later\, wi
 th Sir William Fothergill Cooke of England\, he patented an early telegrap
 h. In 1843\, he brought to notice the Wheatstone bridge\, a device invente
 d by British mathematician Samuel Christie.\n\nHis own inventions include 
 the concertina\, a type of small accordion\, and the stereoscope\, a devic
 e for observing pictures in three dimensions still used in viewing X-rays 
 and aerial photographs. He initiated the use of electromagnets in electric
  generators and invented the Playfair cipher\, which is based on substitut
 ing different pairs of letters for paired letters in the message. He was k
 nighted in 1868.\n
DTSTART;TZID=America/New_York:20260206T000000
DTEND;TZID=America/New_York:20260206T235900
LOCATION:
SUMMARY:1802: Sir Charles Wheatstone\, cipher inventor\, born.
END:VEVENT
END:VCALENDAR