Bell Push Switch

Plotting Mariner’s Compass for Physics Lab – Magnetic needle mounted in a circular dish, having printed scale at the inside of the bottom, fitted with glass on the top.
Diameter :
(a) 12mm
(b) 16mm
(c) 20mm
(d) 25 mm
(e) 38 mm
(f) 50 mm
(g) 75mm

Deflection Magnetometer – Compass box fitted on polished wooden base made of non-wrapping wood with meter scale alongside its length. Compass box is removable