L.E. Knott Apparatus Co. International Correspondence Schools Optical Light Demo For Sale

Antique scientific laboratoryGalvanomelet was used for measuring electric current mounted on a wooden circular base… The L.E. Knott apparatus company of Boston was prominent supplier of scientific equipment to educational institutions in the early 20th century … these Galva meters were essential teaching tools demonstrating the principles of electromagnetism to students and physical laboratories across the United States … time era : 1900 -1910 made in USA materials, brass glass wood and steel ….