The temperature on July 19, 1911 was between 11.4 °C and 22.0 °C and averaged 16.7 °C. There was 11.4 hours of sunshine (71%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
January 5 » Kappa Alpha Psi, the world's third oldest and largest black fraternity, is founded at Indiana University.
February 18 » The first official flight with airmail takes place from Allahabad, United Provinces, British India (now India), when Henri Pequet, a 23-year-old pilot, delivers 6,500 letters to Naini, about 10 kilometres (6.2mi) away.
May 15 » In Standard Oil Co. of New Jersey v. United States, the United States Supreme Court declares Standard Oil to be an "unreasonable" monopoly under the Sherman Antitrust Act and orders the company to be broken up.
August 1 » Harriet Quimby takes her pilot's test and becomes the first U.S. woman to earn an Aero Club of America aviator's certificate.
August 14 » United States Senate leaders agree to rotate the office of President pro tempore of the Senate among leading candidates to fill the vacancy left by William P. Frye's death.
November 5 » After declaring war on the Ottoman Empire on September 29, 1911, Italy annexes Tripoli and Cyrenaica.
Day of marriage August 15, 1934
The temperature on August 15, 1934 was between 10.5 °C and 20.5 °C and averaged 15.2 °C. There was 6.7 hours of sunshine (45%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west. Source: KNMI
January 1 » Alcatraz Island in San Francisco Bay becomes a United States federal prison.
May 28 » Near Callander, Ontario, Canada, the Dionne quintuplets are born to Oliva and Elzire Dionne; they will be the first quintuplets to survive infancy.
July 20 » Labor unrest in the U.S.: Police in Minneapolis fire upon striking truck drivers, during the Minneapolis Teamsters Strike of 1934, killing two and wounding sixty-seven.
July 20 » West Coast waterfront strike: In Seattle, police fire tear gas on and club 2,000 striking longshoremen. The governor of Oregon calls out the National Guard to break a strike on the Portland docks.
September 26 » The ocean liner RMSQueen Mary is launched.
December 29 » Japan renounces the Washington Naval Treaty of 1922 and the London Naval Treaty of 1930.
Day of death February 25, 1961
The temperature on February 25, 1961 was between 5.9 °C and 13.2 °C and averaged 9.7 °C. There was 1.7 hours of sunshine (16%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
March 15 » At the 1961 Commonwealth Prime Ministers' Conference, South Africa announces that it will withdraw from the Commonwealth when the South African Constitution of 1961 comes into effect.
July 19 » Tunisia imposes a blockade on the French naval base at Bizerte; the French would capture the entire town four days later.
July 21 » Mercury program: Mercury-Redstone 4 Mission: Gus Grissom piloting Liberty Bell 7 becomes the second American to go into space (in a suborbital mission).
July 23 » The Sandinista National Liberation Front is founded in Nicaragua.
September 17 » The world's first retractable roof stadium, the Civic Arena, opens in Pittsburgh, Pennsylvania.
October 1 » East and West Cameroon merge to form the Federal Republic of Cameroon.
When copying data from this family tree, please include a reference to the origin: Vera Develing, "Family tree Develing", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-develing/I30.php : accessed March 12, 2026), "Peter Carel Develing (1911-1961)".
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