John Jacob Abel to successfully isolate the neutral base of epinephrine by adding ammonium to highly concentrated extract, a method Abel himself tried but failed due to the use of low concentration of extract. After Takamine's success, Abel himself remarked, with great candor, "The efforts of years on my part in this once mysterious field of suprarenal, medullary biochemistry, marred by blunders as they were, eventuated, then, in the isolation of the hormone not in the form of the free base but in that of its monobenzoyl derivative." Together with L.G. Rowntree and B.B. Turner, Abel devised what they called a "vividiffusion" apparatus,
John Abel that he was the only man in England who was able to create powder mills. Abel is also known to have created a wooden tank called the Sow which Scudmore deployed against the parliamentary garrison at Canon Frome in October 1645. Unfortunately the device was never used in combat as it was surprised by Parliamentarian raiders. Abel is frequently connected to the Hereford Market Hall (which was partially demolished in 1862), though historical evidence suggests that the building was not created by him. In 2008, English Heritage's Inspector of Historic Buildings, Nick Molyneux, was noted as saying that the style