Reading Magnifier, 100mm, 15cm Focal Length Electricity & Magnetism_Electricity & Circuits Eleven-ohm 5A air-cooled rheostat with

Eleven-ohm 5A air-cooled rheostat with constantan winding on a 300x44mm vitreous-enameled steel tube and a slide-bar carriage carrying a phosphor-bronze contact

High-tension power supply driving spectrum and discharge tubes in atomic spectra and gas discharge demonstrations for advanced physics classrooms

Pan balance demonstration lever with a low-friction brass pivot

75-inch plano-convex lenses in an aluminum frame

and torque

Reading Magnifier, 100mm, 15cm Focal Length Electricity & Magnetism_Electricity & Circuits Eleven-ohm 5A air-cooled rheostat withWide field 100mm reading magnifier with a 15cm focal length, the large aperture giving a panoramic view of pages, prints, or specimens during reading and inspection.