Adler, Charles, Jr., 1899-1980 (engineer, inventor) Search this
6 Cubic feet (15 boxes)
Baltimore (Md.) -- 20th century
1899 - 1980
The collection contains correspondence, news clippings, photographs, patents, and printed materials documenting the inventive career of Charles Adler, Jr. Adler is best known for his development of the first traffic actuated signal light in 1928.
Scope and Contents:
The collection contains biographical information about Adler and his career. Materials relating to his professional activities include newspaper clippings, photographs and other memorabilia; his published writings include articles in periodicals and newspapers. In addition, there are patent applications, royalty receipts and correspondence, as well as lengthy descriptions of various safety devices Adler invented. Many photographs are not captioned, including images of devices Adler invented, as well as images of aircraft, automobiles, and trains. There are portraits of family members, Adler, and his associates.
The collection is arranged into six series.
Series 1, Biographical Material, 1899-1980
Series 2, Scrapbooks and Clippings, 1920-1989
Series 3, Correspondence, 1928-1975
Series 4, Patents and Inventions, 1929-1980
Series 5, Photographs and Scrapbooks, circa 1920-1930
Series 6, Publications, 1952-1980
Biographical / Historical:
Charles Adler, Jr. (1899-1980), a professional engineer and inventor was a life-long resident of Baltimore, Maryland. He began his career as an inventor at age 14, receiving a patent on an electric automotive brake. After attending Johns Hopkins University, he served briefly in the Army during World War I and worked at several jobs before being associated in 1919 with the Maryland and Pennsylvania Railroad, where he developed a series of safety devices. In 1928 he developed and installed in Baltimore the first traffic actuated signal light. In 1937 he became a consultant to the Baltimore and Ohio Railroad, continuing to invent safety and signal devices for automobiles, trains and aircraft. He was granted over sixty United States patents. He was a licensed pilot and a member of numerous professional engineering societies. From 1953-1959, Adler served on the Maryland State Aviation Commission and he was a member of the Maryland Traffic Safety Commission from 1952 until his death in 1980.
This collection was donated by Charles Adler, Jr.'s daughter, Mrs. Amalie Adler Ascher on September 15, 1989.
The collection is open for research.
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.