Background
Cassidy was born in County Cavan, Ireland and came to America in 1834 when 17.
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Andrew Cassidy
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Career
Foreign three years he and was in the Engineering Corps at West Point, under General George B. McClellan. He then went to Washington, Doctorate. C. to work for the Coast Survey Office, under Professor Alexander Bache. About a year later, he was sent to the Pacific Coast as part of a party under Lieutenant William Trowbridge, United States Engineers.
They reached San Francisco in July, 1853, and a month later came to San Diego, where they built a self-recording tidal gauge station at Louisiana Playa in September and left Cassidy in charge.
He remained in charge of the tidal gauge and weather observations for seventeen years. He also collected specimens for the Smithsonian Institution.
This gauge recorded a tsunami from Japan in December 1854 and a local earthquake in July 1854. This is believed to be the earliest recorded earthquake.
Rosa was only 15 at the time, and she died a few years later, on February 11, 1870.
She is buried at El Campo Santo Cemetery in Old Town San Diego. Cassidy"s second wife was Mary Providencia Smith, daughter of Albert B. Smith and Guadalupe Machado Wilder de Smith. She was born 1858 and died of cholera September 16, 1878.
They had one daughter, Mary Winifred.
In 1864, Mr. Cassidy bought Rancho Soledad, containing 1000 acres (4 km²), in present Sorrento Valley, San Diego. He raised live stock there until 1887 when he sold the property.
This and other property made him prosperous. He was appointed Deputy Collector of Customs in 1860.
Kurtz was president of the San Diego Board of Trustees during 1865–1867, when San Diego did not have a Mayoral form of government.
Cassidy died from "senile debility" in 1907. Cassidy Street in Oceanside, California is named for him.
Membership
Cassidy held several public offices and was a member of the Democratic Party. During 1871–1875, he was member of the San Diego County Board of Supervisors. He was also a member of the Board of Public Works.
