1967 Caracas earthquake
The 1967 Caracas earthquake occurred in Caracas, Venezuela, and La Guaira, Vargas on 29 July at 8:00 p.m (UTC-04:00 at that time). Its epicenter took place in the litoral central (20 km from Caracas) and lasted 35 seconds. It heavily affected areas such as Altamira, Los Palos Grandes, and Litoral Central. In the aftermath of the earthquake, there were several aftershocks of lower intensity. The earthquake left a toll of 1,536 injured, 225-300 dead, and cost $50-140 million United States Dollars in property damage.
Link River Dam construction stared
The Link River Dam is a concrete gravity dam on the Link River in the city of Klamath Falls, Oregon, United States. It was built in 1921 by the California Oregon Power Company (COPCO), the predecessor of PacifiCorp, which continues to operate the dam. The dam is owned by the U.S. Bureau of Reclamation. Link River Dam's reservoir, Klamath Lake, has a capacity of 873,000 acre-feet (1.077×109 m3). The project provides flood control, generates hydro power, and stores most of the water used for irrigation in the Klamath Reclamation Project. The dam is 22 feet (7 m) high and 435 feet (133 m) long.
Gaspard de Prony died
Baron Gaspard Clair François Marie Riche de Prony was a French mathematician and engineer, who worked on hydraulics. In 1791, de Prony embarked on the task of producing logarithmic and trigonometric tables for the French Cadastre. The effort was sanctioned by the French National Assembly, which, after the French Revolution wanted to bring uniformity to the multiple measurements and standards used throughout the nation. In particular, his tables were intended for precise land surveys, as part of a greater cadastre effort. The tables were vast, calculating logarithms from 1 to 200,000, with values calculated to between fourteen and twenty-nine decimal places.
