Class B Beaded Rim Volumetric Flask, 25mL, Single Graduation, Borosilicate Glass Lab Equipment_Lab Burners 6A with constantan winding on

6A with constantan winding on a 300x44mm vitreous-enameled tube and a slide-bar carriage carrying a phosphor-bronze contact

Educational variant of the 4

dropping into the Worcester Circuit Board Kit for telegraph work

8mm rod attachment and a centered 50mm aperture together hold a lens square against an optical-bench rail for repeatable refraction

image formation

Class B Beaded Rim Volumetric Flask, 25mL, Single Graduation, Borosilicate Glass Lab Equipment_Lab Burners 6A with constantan winding onClass B volumetric flask in borosilicate 3. 3 glass holds 25mL with beaded rim and single graduation for general purpose volumetric measurement.