Mariner’s Compass

Ceramic magnets for good magnetic strength. Half red half blue, spray painted.
50 x 10 x 5 mm.

Dip Circle for Physics Lab with steel needle 10cm long on jeweled bearings, with circular metal scale, 13cm dia. and anti parallax mirror, both rotatable about vertical axis. Aluminium base 15cm dia. marked at four quadrants. Complete with extra needle dimensionally identical to first but un-magnetized.