Chladni’s vibrating plate for Node Patterns
                        
                The plate is covered with thin layer of sand and then made to vibrate by stroking a violin bow over its edge. The sand accumulates on the nodal lines, leaving the vibrating part exposed. The patterns created vary with the intensity of the vibration.
France. Circa 1840.            
            
                
                
                	MarquePlaque vibrante pour figures de Chladni
 	             
            	
	            	MarquePlaque vibrante pour figures de Chladni