3-in-1 Weather Station, 5.12" Diameter Item Type_Springs and tin specimens in a

and tin specimens in a snap-top case for comparative mass-volume calculations

Four-point-five-ohm 9A standard rheostat with constantan winding on a vitreous-enameled steel tube

Aluminum-bodied double-parallel pulley with two 2-inch wheels in a heavy-duty 4

and the alternator principle with stationary inductors

700-microfarad electrolytic capacitor module with 4mm sockets

3-in-1 Weather Station, 5.12" Diameter Item Type_Springs and tin specimens in aThree in one weather station on a 5. 12 inch analog dial combining a thermometer, barometer, and hygrometer in a single classroom scale unit for monitoring room conditions at a glance.