In 1924, Colonel J. (John) Victor Dallin (1897-1991)founded the Dallin Aerial Surveys Company. Dallin was a Royal Flying Corps-trained pilot who served in World War One; in the latter stages of the war, he was sent on aerial photography service forreconnaissance missions.

After the war, in 1919, he put that experience to use when joined Bishop and Barker, a firm which did some aerial survey work. In the 1920s, he worked at the Philadelphia Aero Service Corporation, which operated a flying school in South Philadelphia. In 1924, he left to establish his own company and started Dallin Aerial Surveys as a single proprietorship.

Dallin Aerial Surveys produced photographs like this image of Center City Philadelphia, featuring City Hall, which was taken at 5:40 A.M. on June 24, 1934. Its clients included newspapers, businesses, municipalities, and private individuals, who contracted with the company for aerial images of factories, private estates, schools, country clubs, towns, airports, rivers, and newsworthy sites and events.

International Women's Day is being observed around the world today. The tradition dates back to February 28, 1909, when the Socialist Party of America, acting on the suggestion of party member Theresa Malkiel, held a "National Woman's Day" in New York City.

The following year, the observance was adopted by the International Socialist Women's Conference. In the ensuing years, activists for women's suffrage and other equal rights adopted the date in nations such as Australia, Denmark, Switzerland, and Germany, though the date varied from nation to nation and was sometimes celebrated as the Women's International Day of Struggle or by other names. However, the observance became most strongly associated with communist nations and the international communist movement; it was officially adopted by the Soviet Union in 1917 and the People's Republic of China in 1949.

Happy Industrial Design Day! Industrial design, the practice of optimizing the function, value, and appearance of products, is a central component in America's culture of consumerism as well as the source of many beautiful objects now in the collections of leading art and history museums.

Industrial Design Day first entered into the U.S. Congressional Record in 2015, marks the anniversary of the founding of the Industrial Designers Society of America (IDSA), the result of a merger of several industrial design societies on March 5, 1965. As the home to a number of significant twentieth-century collections that chronicle the evolution of the concepts, products, and processes specific to industrial design, this is one of our favorite not-a-holiday holidays, so we're preparing a little festive toast.

When Dr. Wesley Memeger Jr. started at DuPont in 1964, he was only the fourth African American with a doctorate in chemistry to join the company.

Over the course of a thirty-two-year career, Memeger amassed fourteen patents and left his mark on some of DuPont's most famous products, like Kevlar, the synthetic fiber found in bulletproof vests. His passion for chemistry has also influenced his career as an artist; Memeger's pieces often explore geometrical themes reminiscent of molecular models. On February 24, Hagley Library, in partnership with Clark Atlanta University andBloomfield College, premiered Dr. Wesley Memeger, Jr., Science Into Art, a special documentary chronicling the lifeof Dr. Wesley Memeger, Jr. Now, we're please to announce the debut of a digital exhibit to accompany that work.

Today's #WorkerWednesday post brings us inside the tool room of the Hoopes Brothers & Darlington sawmill in Brooksville, Florida. A note on the reverse of this ca. 1907 photograph identifies the person on the far right asFrank Orville Reagan(1869-1937), the son of Owen Wily Reagan(1847-1909), the sawmill's manager.

The company that owned the mill, Hoopes Brothers & Darlington, began in West Chester, Pennsylvania in 1867 as a manufacturer of wooden spokes for wheels. By the 1880s it had become one of the largest wooden wheel makers in the United States, with mills and timber harvesting operations established throughout the southern United States.

The mill seen here was established in 1906. Hoopes Brothers & Darlington had originally established their Florida operations in nearby Ocala in 1899, but relocated after exhausting local timber supplies and to take advantage of cheaper railroad freight rates. Owen Wiley Reagan had also managed the Ocala mill, with his son Frank working as assistant manager. After his father's death in November 1909, Frank took over operations of the Brooksville mill.

Today is Read Across America Day, an event promoted by the National Educational Association since 1998 as a way to promote and encourage children's reading. Which is as good a reason as any to share this illustrated cover from the 1917 Maxwell Book for Kiddies, a small collection of nursery rhymes compiled by Detroit, Michigan's Maxwell Motor Company.

This booklet is part of Hagley Library's Z. Taylor Vinson collection of transportation ephemera (Accession 20100108.ZTV). For over sixty years, Zachary Taylor Vinson (1933-2009), a senior lawyer with the National Highway Traffic Safety Administration, 1993-1995 president of the Society of Automotive Historians, and 1995-2009 editor of Automotive History Review amassed a large and comprehensive collection of printed material documenting on the history transportation, particularly automobiles.

Today's train wreck of a post features photographs taken on this date, March 1st, in 1906, showing the aftermath of a railroad accident at Emporium, Pennsylvania. The accident, which occurred on the same day, occurred when a Pennsylvania Railroad locomotive tender backed into a box car carrying dynamite manufactured by the Emporium Powder Manufacturing Company. The March 3rd edition of the Philadelphia Inquirer noted that "there was no explosion for some unaccountable reason, and Emporium is still on the map".

These photographs are part of Hagley Library's DuPont Company Museum collection (Accession 1968.001). The materials in this collection were originally compiled by the DuPont Company Museum and document the history of the DuPont Company.

On this date, February 26, in 1919, President Woodrow Wilson signed an act of Congress establishing the Grand Canyon National Park as the 15th park in the U.S. national parks system.

As a 102nd birthday present, we're offering this 1917 photograph of a mule ride on the Bright Angel Trail, a six mile trail still traveled by mules and humans alike. The riders in this photograph included the party of P.S. du Pont and Alice Belin du Pont, who traveled to the Grand Canyon that year in the company of Nathaniel Gould Robertson, May B. Robertson, Charles A. Belin, John P. Nields, Mary Blanchard (Craven) Nields, Louisa d'Andelot (du Pont) Copeland, and Charles Copeland.

This photograph is part of Hagley Library's P.S. du Pont Longwood photograph collection (Accession 1969.002). To view more photographs from this collection in our Digital Archive, click here.

The National Society of Professional Engineers has been sponsoring Engineers Weekevery February since 1951 as a means of calling attention to engineers' contributions to society and advocating for the importance of education in math, science, and technical skills.

Today's Engineers Week theme is Introduce a Girl to Engineering Day, so we're sharing this December 1949 photograph of Florence Naum (1922-2006) testing a generator regular quality control machine at the Ford Motor Company's plant in Ypsilanti, Michigan. The device tested regulators for 1950 Fords under simulated road conditions.

Naum was a resident of Farmington, Michigan. She began her career at Ford as a stock handler in 1939 after graduating high school and, by 1949, was the only woman electrical technician at the company and one of only two women enrolled at the University of Detroit in pursuit of an engineering degree. She eventually earned an electrical engineering degree from the University of Michigan and later became the first female electrical engineer employed at the company.

We're excited to announce that tonight, February 24, Hagley, in partnership with Clark Atlanta University andBloomfield College, will be premiering Dr. Wesley Memeger, Jr., Science Into Art, a special documentary chronicling the lifeof Dr. Wesley Memeger, Jr.

Memeger was a long-time DuPont chemist at the Pioneering Research Laboratory. He began working for DuPont's Pioneering Research Laboratory in 1964 and continued his career there until his retirement in 1997. His research enabled the company to streamline the production of Kevlar, a synthetic fiberdeveloped at DuPont by Stephanie Kwolek in 1965, by discovering a faster polymerization process to help scale for industrial production. Memeger and his wife, a fiber artist, are also accomplished artists, with Memeger's work taking inspiration from the geometric shapes found in molecular compounds.