Aluminum Pendulum Bob with Hook, 25mm Type_Tall Form Two-cylinder brass fluid-pressure apparatus with

Two-cylinder brass fluid-pressure apparatus with 19mm and 38mm leather-packed pistons connected by a brass tube

D-frame compact aquatic net with fine-mesh plankton netting and an integrated flat plastic handle

where current through a coil closes a separate contact and shows how a small signal controls a larger circuit

5mm hole for string suspension

sized for weighing

Aluminum Pendulum Bob with Hook, 25mm Type_Tall Form Two-cylinder brass fluid-pressure apparatus withAluminum 1 inch diameter pendulum bob at 0. 7 oz with a removable threaded brass hook, the lightest option in the series for mass dependent period comparison experiments.