Natuurkundige instrumenten naar Logeman before 1867

"Natuurkundige instrumenten naar Logeman" is a collection of scientific illustrations created by F.W. Funckler before 1867. This specific image, numbered 179, depicts an apparatus for demonstrating the decomposition of salts through the changing color of plant sap. The apparatus features a glass vessel with a metal rod that is connected to a battery. The description suggests that when a current is applied, the plant sap turns red around the positive pole and green around the negative pole, highlighting the principles of electrolysis.