Concave Glass Mirror, 50mm Diameter, 75mm Focal Length Mechanics_Kinematics carrying a red-and-blue spirit column

carrying a red-and-blue spirit column and screen-printed dual scale from -10 to 50°C and 20 to 120°F for long-term readability

this insulated wire pairs a 2mm plug with a crocodile clip to keep polarity color-coded in small-scale circuit work

Twelve-position rotary capacitance substitution box selecting one capacitor at a time

The topics covered on this board include: Nickel metal battery characteristics

Concave Glass Mirror, 50mm Diameter, 75mm Focal Length Mechanics_Kinematics carrying a red-and-blue spirit columnSteeply curved concave glass mirror at 50mm aperture and 75mm focal length, the f 1. 5 ratio favoring intense convergence demos and short throw real image formation work.