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Time measurements.

Subject Source: Unspecified ingested source

Found in 5 Collections and/or Records:

Records of the Harvard College Observatory Chronometric Expedition

Collection Identifier: UAV 630.349
Overview: In the mid-nineteenth century, the Chronometric Expedition was carried out by the Harvard College Observatory, under the direction of William Cranch Bond and in conjunction with the United States Coast Survey. The expedition used chronometers that were made by William Bond & Son, the Bond family's private business, to determine differences of longitude between the observatories in Cambridge, Massachusetts and Liverpool, England. The records primarily consist of notebooks, data sheets,...

Records of Harvard College Observatory Director George Phillips Bond

Collection Identifier: UAV 630.6
Overview: The Records of Harvard College Observatory Director George Phillips Bond, consisting of correspondence and subject files, manuscript drafts, and astronomical data, chiefly document the research activities of the Harvard College Observatory from 1859 to 1865. Chronicled are observations of planets, including Mars and Jupiter; efforts to determine the brightness of stars; and the detection of comets, eclipses, and other astronomical phenomena. George Phillips Bond (1825-1865), an astronomer, was...

Records of Harvard College Observatory Director William Cranch Bond

Collection Identifier: UAV 630.2
Overview: The Records of Harvard College Observatory Director William Cranch Bond document the founding, growth, and scientific research of the Harvard College Observatory primarily from 1840 to 1859. Also chronicled is the Observatory’s participation in advances made in astronomy, stellar photography, meteorology, continental exploration, and technological improvements in astronomical instruments in the early nineteenth century. William Cranch Bond (1789-1859), American astronomer and instrument...

Records of the Harvard College Observatory Time Service

Sub-Fonds Identifier: UAV 630.377
Overview: In 1872, under Director Joseph Winlock, the Harvard College Observatory established the world’s first public time service, which it provided as a commercial service until 1892. The Observatory sold its time service to railroads and businesses by sending hourly signals over Boston’s fire alarm system and distributing time across the region via Western Union telegraph lines; this work eventually resulted in the establishment of the country's first time zone. The Records of the Harvard College...

Somerville High School Film Collection

Collection Identifier: hfa00030
Overview: Consisting of 385 educational films produced for classroom use between the 1930s and 1980s, the Somerville High School Collection provides a representative sample of the subjects and genres of educational media used in classrooms during this period. Though collected by Somerville High School, the films are aimed at students from primary grades through high school and cover a variety of subjects including art, math, music, science, health, and social studies. A highlight of the collection is the...