Instrument for showing that a compass needle not only points to magnetic north but if freely suspended will point into the ground. This later phenomenon is known as the 'dip' of the compass needle. Horizontal scale 0 -90 in 1/20 on either side of N…
Azimuth compass in wooden box with lid and lock and key . Brass scales. 4 sights are detachable - 2 fit on rotating compass ring and 2 on meridional line. Each sight has a slit and a cross wire one above the other. Box has inset disc ' Univ. Abdn.…
small wooden box with three plastic terminals, one big black switch and a screen with a scale from 0 to 0.5 amperes. One connecting screw on each end and a plaque with NEUTRALISING UNIT REF NO IOA/8475
11 circular glass lenses to cover the eye set in metal frames with small circular handle for holding with thumb and forefinger. Part of colour blindness kit. Colours: 4 black, 1 red, 1 turquoise, 1 orange, 1 green, 1 light royal blue, 1 dark royal…