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Later DC-6 variants had a longer fuselage, increased range, and higher weight capabilities, and include the DC-6A cargo-liner, the DC-6B passenger-liner, and the convertible cargo/passenger DC-6C. #WingWednesday #avgeek This tweet was posted on April 21, 2021.

The Douglas DC-6 was initially conceived of as a military transport but its design was changed to a civilian airliner following the end of WWII. It was fundamentally an updated, enlarged, and pressurized DC-4 built to compete with the Lockheed L-049 Constellation. #WingWednesday This tweet was posted on April 21, 2021.

The passenger versions could feature luxuriously appointed cabin interiors with options for a lounge in the tail section and sleeper berth accommodations. #WingWednesday #avgeek This tweet was posted on April 21, 2021.

📸 3/4: Braniff, Douglas DC-6; c. 1947 Gift of M.D. Klaas 2018.112.0086 Panagra, DC-6; c. 1950 Gift of M.D. Klaas 2018.112.0300 Japan Air Lines, DC-6B, @flySFO; 1954 Gift of Thomas G. Dragges 2015.165.103 a b This tweet was posted on April 21, 2021.

Emrich then fills the plastic depressions with bottled water and photographs the composition with a large format film camera. He produces compositions that captivate, challenge, and beg us to reconsider our own relationship with objects that are so easily discarded. #EarthDay This tweet was posted on April 22, 2021.

In his series All Consumed, artist Gary Emrich draws focus on the industry, its advertising imagery, and its embrace of single-use packaging. To create these photos, he layers a transparent clamshell container with water bottle packaging and places it on a light table. #EarthDay This tweet was posted on April 22, 2021.

Nearly six billion pounds of plastic bottles are discarded annually and it is estimated that half once contained only water. With just 1/3 reaching a recycling facility, the 200-billion-dollar bottled water industry is a significant contributor to landfills worldwide. #EarthDay This tweet was posted on April 22, 2021.

RT @thisisaaronland: I wrote a blog post / about updating @sfomuseum ’s javascript-webassembly EXIF writer to encode GPS coordinates / and… This tweet was posted on April 26, 2021.

Women have worn hairnets for centuries for reasons including aesthetics, protecting hairstyles, and sanitary purposes. Hairnets have been made from a variety of materials ranging from real human hair and silk to nylon in various hair color shades. #HairStyle This tweet was posted on April 23, 2021.

Can you imagine a undertaking cross-country road trip on a motorcycle…over 100 years ago? To promote the idea of women as military dispatch riders, sisters Augusta and Adeline Van Buren did just that, departing New York for San Francisco in 1916. #EarlyAmericanMotorcycles This tweet was posted on April 26, 2021.

Due to COVID-19, the class was online. Students set up their own studios at home, using minimal space, small formats, and just a few specialized tools for printing. Rising to the occasion, their works include traditional monoprint, hand-coloring, toner-transfer, and collage. This tweet was posted on April 08, 2021.

The combs used to style afros also reflected these principles, none more so than the fist comb. With a handle in the shape of the Black Power salute, a variety of styles were designed and patented in the 1970s. #HairStyle This tweet was posted on April 09, 2021.

📸: United DC-4E; c. 1939 Gift of Jane Luna Euler 2013.106.026 United DC-4E; 1939 Gift of Frank A. Norick 2013.075.015 Colonial Airlines, DC-4 over New York City; c. 1946 Gift of M.D. Klaas 2018.112.0121 MATS, Douglas C-54; c. 1945 Gift of the Pan Am Assoc. 2000.058.0472.028 This tweet was posted on April 07, 2021.

By the late 1960s, the afro hairstyle, famously worn by political activist Angela Davis and celebrities including Nina Simone and Diana Ross, became a symbol of Black pride, solidarity, and empowerment. #HairStyle This tweet was posted on April 09, 2021.

Designed in secret under the leadership Clarence "Kelly" Johnson, and with direction from Hughes, the renamed L-049 Constellation evolved into an extremely fast, revolutionary large-capacity airliner with a unique dolphin-shaped fuselage and distinctive tripletail. #WingWednesday This tweet was posted on April 14, 2021.

In the late 1930s, Lockheed was developing a high-speed pressurized airliner, designated the L-044 Excalibur. Howard Hughes, who, in 1939, had acquired a majority share of TWA, requested that the airliner be redesigned and developed to his specs... #WingWednesday This tweet was posted on April 14, 2021.

Operated by numerous airlines on domestic and transatlantic routes, the airliner played a major role in advancing long-range commercial aviation during the immediate postwar era. #WingWednesday This tweet was posted on April 14, 2021.

Entrepreneur, philanthropist, and social activist, Madam C. J. Walker (1867–1919) created a haircare empire, including a product line, training schools, and salons, which made her one of the wealthiest African Americans of her time. This tweet was posted on April 01, 2021.

From the dreams of young factory workers in China to traditions from the plains of southern Spain, and from the perseverance of artistic aspirations in a Syrian refugee camp to the escapism through a form of combat unique to Rio de Janeiro's largest favela... #VideoArtsSFOM This tweet was posted on April 16, 2021.

In the United States, the 1970s were primarily a dormant period for instrumental rock until the end of the decade, when in 1979, Jon & The Nightriders unleashed a surf music revival with their self-titled 7” EP. #InstrumentalSurf This tweet was posted on April 15, 2021.

Surf music was welcomed amidst the punk, garage, and new wave movements of the 1980s in such diverse venues as Knott’s Berry Farm, the punk-rock-haven Madame Wong’s West, and the historic Whisky A Go-Go. #InstrumentalSurf This tweet was posted on April 15, 2021.

📸 2/2: Pan American World Airways, Lockheed L-049; c. 1946 Gift of M.D. Klaas 2018.112.0671 TWA (Trans World Airlines), Lockheed L-049; c. 1950 Gift of Charles Loomis 2005.062.012 a lighter: Lockheed L-049; late 1940s Gift of Thomas G. Dragges 2003.065.108 This tweet was posted on April 14, 2021.

📸: Jon and the Nightriders 7" EP California Records | Riverside, CA Fender Jaguar 1965 Fender 6G15 Reverb 1962 played/used by John Blair of Jon & The Nightriders Recorded Live At Hollywood’s Famous Whisky A Go-Go 1980 Voxx Records | Los Angeles All: Courtesy of John Blair This tweet was posted on April 15, 2021.

Allan's friend Mike Curb produced films & enlisted him to provide music for his soundtracks. Allan’s revolutionary “Blues Theme” featured a “fuzz” distortion guitar effect & was used in the opening scene of Curb’s 1966 motorcycle film The Wild Angels. 🎶👂 https://t.co/JH8GSnQYz0 This tweet was posted on April 05, 2021.

Although they built just three more of their simple, single-cylinder motorcycles the following year, Harley-Davidson moved to a new building on the company’s current Juneau Avenue site and increased production to fifty motorcycles in 1906. #EarlyAmericanMotorcycles This tweet was posted on April 02, 2021.

Davie Allan is an instrumental rock guitarist who enjoyed popular success in the mid- to late-1960s, even as demand for surf music and instrumentals waned. As a teen, he was inspired by Duane Eddy’s distinctive tone and emphasis on the lower notes of the guitar. #InstrumentalSurf This tweet was posted on April 05, 2021.

In 1910, Harley-Davidson moved into a modern 9,520 square-foot production facility, and by 1913 they produced more than sixty motorcycles per day. #EarlyAmericanMotorcycles This tweet was posted on April 02, 2021.

The 1910 Harley-Davidson Model 6 on display features an optional carbide headlamp, which is lit by flammable acetylene gas that is produced by a reaction between carbide pellets and water in the base of the lamp. #EarlyAmericanMotorcycles This tweet was posted on April 02, 2021.

The hit song was developed into the Blues Theme album, which showcased a unique style created by Allan that mimicked motorcycle sounds with extensive fuzz distortion and tremolo-bar bending on the lower notes of his guitar. #InstrumentalSurf This tweet was posted on April 05, 2021.

William S. Harley, along with brothers Arthur, Walter, and William Davidson constructed the first three Harley-Davidson motorcycles in 1903 in a small workshop located in the backyard of the Davidson family home in Milwaukee, WI. #EarlyAmericanMotorcycles This tweet was posted on April 02, 2021.

📸: Madam C. J. Walker in front of her home and business; c. 1912 Indianapolis, IN Madam C. J. Walker product line; c. 1918 Madam C. J. Walker and Booker T. Washington at a YMCA opening; 1913 Indianapolis, IN All are courtesy of @IndianaHistory's Madam C. J. Walker Collection This tweet was posted on April 01, 2021.

Deemed too complicated and expensive to operate, its design was changed to a smaller, unpressurized airliner with a single tail, which became the DC-4. #WingWednesday #AvGeek This tweet was posted on April 07, 2021.

In the late 1930s, United Air Lines asked Douglas Aircraft to develop a large-capacity, long-range, pressurized, four-engine airliner. The DC-4E featured a tripletail and a nose wheel, then unique to large passenger aircraft, and first flew in 1938. #WingWednesday #avgeek This tweet was posted on April 07, 2021.

The field lighting control building was originally located across a parking lot from Hangar No. 2 (at bottom, center of historic image). By the time it was torn down, it was just west of the end of runway 28L. #SFOHistory This tweet was posted on April 06, 2021.

Most sales of the Lodestar were to foreign airlines or to the U.S. military, as improving air strength was a priority leading up to World War II. After the war, many were converted into private or executive aircraft with a sleek, club-style interior. #WingWednesday This tweet was posted on March 24, 2021.

The first wave of instrumental surf music captivated young people all across the United States. Surf music was loud and dynamic, driven by Fender guitars played through the company’s new Reverb unit, which produced a watery, echo-like effect. #InstrumentalSurf This tweet was posted on March 26, 2021.