Cecelia Jessie Johnston
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Parents
Spouse
Herbert H Hall
Herbert H Hall
1879 - 1957
Children
Cecelia Mary Hall
Cecelia Mary Hall
1905 - 1979
Herbert Johnson Hall
Herbert Johnson Hall
1909 - 1974
Elsie Jean Hall
Elsie Jean Hall
1912 - 1973

1891


Age: 10y
1891 • First long-distance transmission of alternating current by the Ames power plant near Telluride, Colorado, by Lucien and Paul Nunn.

1905


Aug 12
Age: 25y
1905 Albert Einstein publishes his paper On a heuristic viewpoint concerning the production and transformation of light, in which he explains the photoelectric effect using the notion of light quanta.

1930


Apr 8
Age: 50y
1930 • While studying photographs taken in January, Clyde Tombaugh confirms the existence of Pluto, a Celestial Body considered a planet until redefined as a dwarf planet in 2006.

1940


Apr 19
Age: 60y
Herbert H Hall - 1940 United States Federal Census

residence


Bridgewater, Pennsylvania, USA ⇓
The Census indicates Herbert is no longer physically able to work
1 Source ⇓
1940 Leon Trotsky is attacked with an ice axe in his Mexico home by NKVD agent Ramón Mercader.

1950


Apr 10
Age: 70y
1950 Annapurna I, 10th highest mountain in the world, is first ascended.

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