Close up of regulator valve and pressure gauges as used to inflate ceiling balloons. The closer of the gauges shows the helium flowing to the balloon. The further gauge shows the amount of helium remaining in the tank.
Close up of the filler stand
A ceiling balloon cabinet. At the bottom can be seen the filler stand. The hose runs from the filler stand to the needle valve and then to the helium cylinder. On the left are stored more balloons, string and pibal lights.
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 graduate for measuring the amount of melted snow.
The snow gauge funnel and mount. The container fits inside the funnel.
Copper catchment container for snow gauge.
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 tipping bucket rain gauge.
Exterior of a tipping bucket rain gauge.
View of the recorder and chart for a tipping bucket rain gauge as used in Canada. Each vertical line is a 10 minute period. Each horizontal line is 0.4 mm (0.02 in). The chart lasts for one day. The unit is powered by a clockwork motor
Close up of a chart used with a tipping bucket rain gauge. Each vertical line is 10 minutes and each horizontal line is 0.4 mm (0.02 in). Each upward step of the ink line is 0.2 mm (0.01 in).
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.
Interior of a Stevenson screen showing (from left to right) the dewcell, wet bulb with wick attached to water supply, dry bulb and dry thermistor. The metal pipe is called a psychrometer and sucks air across the thermometer
Exterior shot of a Stevenson screen. Visible at the top is the psychrometer motor.