Wooden Test Tube Support with Draining Pins, 6-Place Subcategory_Power Supplies illustrating how differential thermal expansion

illustrating how differential thermal expansion makes and breaks a low-current circuit

providing the high-resistance leg of a voltage divider where current draw needs to stay in the microampere range

5 ohms and 9A with oxidized constantan winding on a vitreous-enameled tube and three binding posts

Half life-size circulatory system board traces arterial and venous pathways from heart to peripheral capillaries with numbered

75:1 step-up ratio

Wooden Test Tube Support with Draining Pins, 6-Place Subcategory_Power Supplies illustrating how differential thermal expansionDraining pins paired with a turned post hardwood frame give this six place test tube support inverted drying plus upright storage for tubes up to 19 mm across.