High-Current Standard Resistance Coils Subcategory_Scoops and Spatulas 8mm rod attachment and a

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

Spare charged porous pot for the Leclanche cell

Decade capacitance box stepping from 10pF to 100pF in 10pF increments at plus-or-minus 5% on a 63V rating

Long 1000mm black insulated lead with crocodile clips at both ends

High-Current Standard Resistance Coils Subcategory_Scoops and Spatulas 8mm rod attachment and aHeavy current 1. 5 ohm reference coil non inductively wound from constantan on a 43mm ABS supported bobbin with three 4mm sockets, rated to 8A for series resistor or potentiometer use.