what did sir john frederick william herschel do?
Cyanotype Photographic fixer Actinometer
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 Herschel notified the Astronomer Royal , Nevil Maskelyne , of his discovery and received this flummoxed reply from him on 23 April : " I don 't know what to call it . It is as likely to be a regular planet moving in an orbit nearly circular to the sun as a Comet moving in a very eccentric ellipsis . I have not yet seen any coma or tail to it " . 

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 Chadwick dropped all his other responsibilities to concentrate on proving the existence of the neutron , frequently working late at night . He devised a simple apparatus that consisted of a cylinder containing a polonium source and beryllium target . The resulting radiation could then be directed at a material such as paraffin wax ; the displaced particles , which were protons , would go into a small ionisation chamber where they could be detected with an oscilloscope . 

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 As a Harvard undergraduate , Kaczynski was among twenty @-@ two students who were research subjects in ethically questionable experiments conducted by psychology professor Henry Murray from late 1959 to early 1962 . 

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 = = = Epitome of Copernican Astronomy , calendars , and the witch trial of his mother = = = 

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 In March 1801 , Frederick Accum was offered a position at the Royal Institution in Ablemarle Street , a research institute founded two years earlier by Count Rumford . Accepting the position , he began as laboratory assistant to Humphry Davy , who had been hired at the same time as director of the laboratory , and would later become the president of the Royal Society . Accum ’ s employment at the Royal came to an end in September 1803 . His biographer , R. J. Cole , speculates this change was connected with the simultaneous departure of Count Rumford for employment in Paris . Rumford had been the driving force behind securing a position for Accum . 
