Multiple Connection Receiver Adapter, 19/26 Socket and 19/26 Cone, Borosilicate Glass Material_Glass 5V replacement element so wet-cell

5V replacement element so wet-cell demonstrations stay running once the original electrolyte loses charge capacity

this electromagnet-driven pivoted-arm sounder on a wooden base produces the snap of early telegraph operation when current pulses the coil

Plano-cylindrical lens at 50 by 50mm with 17 diopter optical power and ground polished edges

Polished aluminum calorimeter at 75 by 50mm with a wood or plastic lid

Multiple Connection Receiver Adapter, 19/26 Socket and 19/26 Cone, Borosilicate Glass Material_Glass 5V replacement element so wet-cellMultiple connection receiver adapter in borosilicate glass features 19 26 socket for connecting multiple apparatus components in chemistry setups.