The temperature on May 11, 1889 was about 13.1 °C. There was 4 mm of rain. The air pressure was 4 kgf/m2 and came mainly from the east-northeast. The airpressure was 75 cm mercury. The atmospheric humidity was 89%. Source: KNMI
January 22 » Columbia Phonograph is formed in Washington, D.C.
February 9 » US president Grover Cleveland signs a bill elevating the United States Department of Agriculture to a Cabinet-level agency.
February 11 » Meiji Constitution of Japan is adopted.
May 11 » An attack upon a U.S. Army paymaster and escort results in the theft of over $28,000 and the award of two Medals of Honor.
September 28 » The General Conference on Weights and Measures (CGPM) defines the length of a meter.
November 23 » The first jukebox goes into operation at the Palais Royale Saloon in San Francisco.
Day of marriage March 4, 1911
The temperature on March 4, 1911 was between 4.4 °C and 9.6 °C and averaged 7.4 °C. There was 3.6 mm of rain. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
January 12 » The University of the Philippines College of Law is formally established; three future Philippine presidents are among the first enrollees.
May 15 » More than 300 Chinese immigrants are killed in the Torreón massacre when the forces of the Mexican Revolution led by Emilio Madero take the city of Torreón from the Federales.
May 30 » At the Indianapolis Motor Speedway, the first Indianapolis 500 ends with Ray Harroun in his Marmon Wasp becoming the first winner of the 500-mile auto race.
June 16 » IBM founded as the Computing-Tabulating-Recording Company in Endicott, New York.
October 24 » Orville Wright remains in the air nine minutes and 45 seconds in a glider at Kill Devil Hills, North Carolina.
November 3 » Chevrolet officially enters the automobile market in competition with the Ford Model T.
Day of death April 19, 1960
The temperature on April 19, 1960 was between 6.0 °C and 19.2 °C and averaged 11.9 °C. There was 7.6 hours of sunshine (54%). The partly or heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
January 1 » Cameroon achieves independence from France and the United Kingdom.
January 6 » National Airlines Flight 2511 is destroyed in mid-air by a bomb, while en route from New York City to Miami.
January 14 » The Reserve Bank of Australia, the country's central bank and banknote issuing authority, is established.
July 11 » Congo Crisis: The State of Katanga breaks away from the Democratic Republic of the Congo.
September 2 » The first election of the Parliament of the Central Tibetan Administration, in history of Tibet. The Tibetan community observes this date as Democracy Day.
December 13 » While Emperor Haile Selassie of Ethiopia visits Brazil, his Imperial Bodyguard seizes the capital and proclaims him deposed and his son, Crown Prince Asfa Wossen, Emperor.
When copying data from this family tree, please include a reference to the origin: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I94072.php : accessed January 24, 2026), "Petrus Holtkamp (1889-1960)".
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