Rear of the electrolyser.
Compressor pump in operation. Pumping and compressing hydrogen from the low pressure tank to the high pressure tank.
Fyrite tester used to check the purity of the hydrogen. The oxygen content should read 0%.
800 g (28 oz) weather balloon, still in plastic wrap, and filling stand with 1,500 g (53 oz) lift.
Exterior of a ceiling projector.
Alidade as used with a ceiling projector with a 300 m or 1000 ft baseline. The outer scale is in meters and the inner scale in feet.
Dark adaptor goggles are used at night prior to going outside to adapt the eyes to the dark.
Standard Ice Accretion Indicator (upside down).
Close up of a summer sunshine card for the Campbell-Stokes recorder. The amount of sunshine is recorded in 10th's of an hour.
Aircraft altimeter set at 75 ft (23 m) showing a pressure of 29.87 in (1011.5 hPa). This altimeter is mounted in a console at a radio station.
The snow gauge funnel and mount. The container fits inside the funnel.
Standard rain gauge. On the right can be seen a overflow catch with a metal pipe that fits over a metal post in the ground. On the left is the funnel with the graduated cylinder attached.
The interior of a simple hygrometer. As the humidity rises the coil will expand.
Close up of the bulb of a maximum thermometer. The constriction in the tube and the break in the column of mercury can easily be seen.
A sling psychrometer, showing the "wet bulb" on top. The muslin sleeve, pictured here, is used at temperatures above −10 °C (14 °F) and when the temperature is colder then a thin layer of ice is formed on the bulb.