Optically Worked Double Concave Glass Lens, 75mm Diameter, 1000mm Focal Length Meters_Electrical Solid specific gravity bottle in

Solid specific gravity bottle in borosilicate glass holds 50mL for precise density determination of solid samples in physics and chemistry

energizing spectrum tubes from a 110V source to excite hydrogen

supplying a 1

letting students drive the lamp directly or send the slow AC output to a meter or oscilloscope

sized to fill the gap between 100-ohm and 1k values for fine-grained voltage-divider investigations

Optically Worked Double Concave Glass Lens, 75mm Diameter, 1000mm Focal Length Meters_Electrical Solid specific gravity bottle inExtra long 1000mm focal length 75mm double concave glass lens, the near flat diverging curvature giving near collimated virtual reflections for astronomical and parallel beam analogue work.