How to improve the reading of the meniscus with a black and white piece of paper (left). Burette acc. to Erdmann's floater: the glass insert floats along the surface of the liquid and produces a very thin side meniscus (right). This was a very cumbersome system, and was quickly abandoned.
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Alessandri, P. E. Analisi Volumetrica Applicata Ai Prodotti Commerciali e Industriali; Ulrico Hoepli: Milano, 1895. OCLC: 635717336