antique  hand-cracked revolver mirror apparatus

rotating mirrors were used  to see the difference in two different frequencies

 with a manometric flame

( experiment by Koenig  end 1880 )

ca 1910

cast iron frame & base

good condition

VERY BIG SIZE :  73 cm high ! and 50 cm high

the mirrors 25 cm x 14 cm

 

info : dirk.balduyck@telenet.be

 

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