"Papillon" camera by Germaine de Laperrière. 100% aluminium construction, and therefore very light - only 850 grammes. According to an article in "la Nature" on 8 April 1899 , a wooden camera of the same size weighed 2 kg. (see attached document). Further more, the costrution of this camera allows it to withstand changes in temperature, according to advertising at the time.
(see the article by Guy Vié in "le bulletin Niépce Lumière" N°139 year 2007.)