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Aeronautical Syndicate Limited (ASL) was founded in 1909 at Larkhill on Salisbury Plain by Horatio Barber
They were one of the world's first aircraft manufacturers.
Horatio Barber started the business in a railway arch at Battersea but in 1909 he moved to Larkhill on Salisbury Plain.
The first successful flights were in March 1910 with a tail-first pusher type. By September 1910 the fifth experimental desigh the Valkyrie I was flying powereed by 35 hp engine by the Green Engine Co.
In October 1910 a three-seater Valkyrie II with a 60 hp Gnome engine was flying.
Barber designed and built some 30 Valkyrie tail-first canard monoplanes for one, two and three people. They were powered by the 50hp Gnome engine.
The company closed in 1912.