Bell in Vacuum, Glass, AC/DC Biology_Microscopy the smallest in the Alnico

the smallest in the Alnico horseshoe series and well sized for individual student handling during basic attraction-and-repulsion lessons

protecting the wooden edges during daily classroom handling and extending the usable life of the measurement tool

Five-cylinder equal-mass set with hooks in copper

supported on die-cast end pieces with a nickel-plated phosphor-bronze sliding contact

110 ohms via rotary selector knobs

Bell in Vacuum, Glass, AC/DC Biology_Microscopy the smallest in the AlnicoBell in vacuum jar with a 15cm electric bell on 4 6V AC DC suspended inside a 20 by 10cm glass chamber, demonstrating that sound requires a medium to propagate.