title: Charles de Haldat du Lys
text: # Charles de Haldat du Lys
  
  Charles Nicolas Alexandre Haldat du Lys (24 December 1770 – 26 November 1852) was a French physicist who performed experimental work in hydrostatics.
  
  He was a critic of the reliability of Benjamin Thompson's researches on the generation of heat, An Experimental Enquiry Concerning the Source of the Heat which is Excited by Friction.
  
  