Probably used at the Ballarat School of Mines. It indicates the percentage of relative humidity .A circular dial with non-linear graduations and centre-pivot pointer. it is mounted in a brass case, with rear mounting flange. The markings on the Hygrometer at Very Dry, Dry, Normal, Moist. It has a crescent moon dial indicatorballarat school of mines, meteorology, weather, scientific instruments, scientific objects, hygrometer, relative humidity

Stevenson screens were first introduced in Australia in the 1880s and were widely installed by 1910. The screens have been used to shelter and protect thermometers and other meteorological instruments from rain and direct heat while the holes and double-louvre walls allowed air to flow around them. Sometimes other meteorological instruments were included in the weather stations, so there were different Stevenson Screen sizes. This authentic, original Stevenson screen was previously owned by the Australian Bureau of Meteorology and was used for many years for weather readings at the Cape Otway Light Station in southwest Victoria. The Lighthouse Keepers recorded the readings for minimum and maximum temperatures at 9 a.m. every day from January 1865 until April 1994. The equipment was sheltered in a Stevenson Screen from 1902 until April 15 1994, when the mercury thermometer was replaced by a platinum resistance probe within an Automatic Weather Station (AWS). This Stevenson screen is one of the two screens that then became redundant. The other Stevenson screen was kept to display to visitors. Lightkeepers were no longer required at the Cape Otway Light station either, due to the automated system. The meteorological instruments donated with the screen were used for measuring temperature and humidity. They are mounted on a metal bracket that fits across the screw holes on the screen’s internal frame. The glass-covered Relative Humidity (RH) sensor was made by the renowned precision instrument maker, Rotronic AG of Switzerland, which was founded in 1965. The firm made its first electronic temperature and humidity instrument in 1967. Meteorological records have been collected in Australia from the 1800s. The records were collated, published and used as a basis for weather forecasts. Many sectors, such as maritime and agriculture industries, have relied on these figures for making important decisions. The quality and placement of the meteorological instruments used to measure temperature and humidity are of utmost importance for accuracy. In early colonial times, there were no national standards for meteorological instruments that would allow for accurate figures and comparisons. Once the Bureau of Meteorology was established (around 1908 to 1910) the department installed Stevenson screens throughout Australia, many at lighthouses and light stations, and the measuring instruments were standardised. The Stevenson Screen was named after its inventor, Scottish Civil Engineer Thomas Stevenson (1818-1887) who was also the father of Robert Louis Stevenson, author. Stevenson developed the small thermometer screen around 1867. It had double-louvred walls around the sides and a top of two asbestos sheets with an air space between them and was thickly painted with a white coating that reflected the sun’s rays. This design was modified in 1884 by Edward Mawley of the Royal Meteorological Society. Standards were set for the locations of the screens and instruments, including their distance above ground level and the direction the door faced.Stevenson screens played a significant part in providing a standardised shelter for all meteorological instruments used by the Australian Bureau of Meteorology from about 1910 until 1994. The readings from the instruments gave the meteorological statistics on which weather forecasts throughout Australia were based. This Stevenson screen was used locally at Cape Otway, along the Great Ocean Road in southwest Victoria, so contributed towards our local forecasts and weather warnings.Stevenson screen, original, from the Australian Bureau of Meteorology’s weather station at the Cape Otway Lighthouse. The screen is a white wooden cupboard with a slanted cover raised above the top. The top has ten drilled ventilation holes, and the sides and door are made of downward-slanting double louvres. Two brass hinges join the door to the lower edge of the screen and a metal fitting at the top edge allows for a padlock closure. The screen is supported on four short legs, each with a hole drilled from side to side for fitting to a frame. Inside the screen are two wooden frames fitted with hooks and screws. The floor has three boards; one across the back and one across the front at the same level, and a board wider than the space between these boards is fitted higher, overlapping them slightly. Inside the screen, a pair of electronic instruments with short electric cables is mounted on a metal bracket with drilled holes in it. One of the instruments is a Relative Humidity (RH) probe. It is 26 cm long and is a glass tube with a filter on one end and an electrical connection on the other. It has inscriptions on its label, showing that was made by Rotronic AG, Switzerland. The other instrument is a Resistance Temperature Device (RTD) thermometer. It is 22.5 cm long and has a narrow metal probe joined to a hexagonal metal fitting. A brass plate on the front of the screen has impressed inscriptions. The screen is Serial Number 01/C0032, Catalogue Number 235862.Stamped into brass plate "CAT. NO. / 253862 / SERIAL NO. 01/C0032" On instrument’s electrical fitting; “CD2” [within oval ‘+’ above S] “Serie693 op65 / 220/380V~16A” On instrument’s glass; “rotronic ag” “SWISS MADE” “CE / CH-8303 / Bassersdorf” Symbol for [BARCODE] “ART NO MP 101A_T4-W4W” “POWER 4.8.30VDC“ “OP. RANGE: 0-100%RH/-40+60° C” “OUT H 0-100% 0-1V” “OUT T -40+60°C -0.4..+0.6V” “SERIE NO 19522 009”flagstaff hill maritime museum and village, warrnambool, maritime museum, maritime village, great ocean road, shipwreck coast, cotton region shelter, instrument shelter, thermometer shelter, thermoscreen, thermometer screen, measuring instruments, meteorological instrument, weather recording, weather station, lighthouse equipment, light station equipment, stevenson screen, marine instruments, mercury thermometer, platinum resistance probe, aws, automatic weather station, rotronic ag, swiss made, meteorological device, weather forecast, weather prediction, weather records, meteorological forecast, meteorological record, australian bureau of meteorology, bureau of meteorology, bureau, bom, relative humidity, rh, relative humidity probe, resistance temperature device, rtd, thermometer, temperature, humidity, cape otway, cape otway lighthouse, cape otway light station, rotronic, switzerland, swiss instrument, thomas stevenson, double-louvered walls, edward mawley, royal meteorological society, 01/c0032, serial number, cat. no. 235862, serial no. 01/c00323

Used for measuring relative humidity.Wet and dry hygrometer made of two mercury and glass thermometers set on wooden stand.Label: “Nat Phil Lab No. Univ of Melb.”hygrometer, wet and dry hygrometer, measuring equipment

Bushfire behaviour is influenced by many factors including temperature, relative humidity (RH), forest type, fuel quantity and fuel dryness, topography and even slope. Wind has a dominant effect on the Rate of Spread (ROS), as well as fire size, shape and direction. Temperature and relative humidity have major impacts on fuel dryness and therefore upon the availability of fuel for combustion. A thermo-hygrograph measures and records both temperature and humidity. It produces a continuous record by drawing ink traces on a paper chart held in revolving cylinder. Humidity is measured by shortening or lengthening of specially treated human hair. Temperature is measured by means of a bi-metallic strip. This particular instrument is a seven day recorder. The instrument is driven by clockwork. Serial number 10186 which probably dates from about 1960. The chart indicates it was last used in March 1979.Used for bushfire research.Clockwork Thermo Hygro GraphCasella London 10186 Made in England Research Branch. Forests Commission Orbostbushfire

Bushfire behaviour is influenced by many factors including temperature, relative humidity (RH), forest type, fuel quantity and fuel dryness, topography and even slope. Wind has a dominant effect on the Rate of Spread (ROS), as well as fire size, shape and direction. Temperature and relative humidity have major impacts on fuel dryness and therefore upon the availability of fuel for combustion. The amount of fine fuel available can increase rapidly from nearly zero when fuel moisture content is more than 16% after rain or a heavy morning dew, to many tonnes per hectare as fuel dries out later in the day and the moisture content drops below 9%. This explosive escalation in the amount of available fuel can happen over a few hours on hot and windy days. A sling psychrometer is a simple device for determining air temperature and relative humidity. It contains two thermometers, one of which is covered with a wick saturated with ambient temperature liquid water. These two thermometers are called dry bulb and wet bulb. When the sling psychrometer is spun rapidly in the air, the evaporation of the water from the wick causes the wet bulb thermometer to read lower than the dry bulb thermometer. After the psychrometer has been spun long enough for the thermometers to reach equilibrium temperatures, the unit is stopped, and the two thermometers are quickly read. A psychrometric scale on the side of the instrument is then used to convert the dry bulb temperature TDB and the wet bulb temperature TWB into humidity information. The wet bulb temperature is approximately equal to the adiabatic saturation temperature. The thermometers fold back into the plastic handle when not in use. Used to measure temperature and relative humiditySling PsychrometerBACHARACH INSTRUMENTS - Pittsburg PAbushfire

Bushfire behaviour is influenced by many factors including temperature, relative humidity (RH), forest type, fuel quantity and fuel dryness, topography and even slope. But wind has a dominant effect on the Rate of Spread (ROS), as well as fire size, shape and direction. Wind speed can be measured using a variety of anemometers. This simple hand-held Venitimer was made by Elvometer in Sweeden, probably in the 1960s, and was designed for principally for mariners. Some models have a compass in the handle to measure wind direction. The small inlet hole on the side is faced towards the wind and air pressure lifts small plastic disk inside. The upper tube is tapered so that as wind speed increases more air escapes and stronger winds are needed to raise the disk. Wind speed in MPH is read from the side of the clear plastic tube. The waterproof container has instructions on use and conversion scales. Simple and robust device.Hand- held wind anemometer Instructions on use on containerbushfire

A smoothing plane is typically used after the work piece has been flattened and trued by the other bench planes, such as the jack, fore, and joiner planes. Smoothing planes can also be used to remove marks left by woodworking machinery. When used effectively alongside other bench planes, the smoothing plane should only need a handful of passes removing shavings as fine as 0.002 inches (0.051 mm) or less. The work piece is then ready to be finished, or can be further refined with a card scraper or sandpaper. The smoothing plane is usually held with both hands, and used in a similar manner to the other bench planes. Though designed for smoothing, a smoothing plane can be used as an 'all-round' bench tool and for rougher work depending on how it is set up. Being smaller than other bench planes, the smoothing plane is better able to work on smaller work pieces and around obstructions. Since the 1700s wooden smoothing planes have predominantly been 'coffin shaped' wider in the middle and slightly rounded making them more manoeuvrable. It has also been claimed that the coffin design exposes more end grain, enabling the plane to better adjust to changes in humidity. Henry Boker Maker: Heinrich "Henry" Böker of Reimschied-Solingen, Germany and his family was making tools in the 17th century. In 1829 Hermann and Robert Böker added sabres to the company's offerings, in 1837 they emigrated to New York City and established a firm to import German cutlery. H. Boker sabres would be eventually supplied to some American soldiers during the Civil War. Heinrich Boker in 1869 , a relative of Hermann and Robert, established a cutlery firm in Solingen, a centre of industry and cutting tool manufacturing in Germany. The company became a leader in the manufacture of razors, scissors and eating utensils. As early as 1900 the majority of tools produced by Boker were distributed in the U.S. market by the New York branch of the family, and pocket knives became the company's most important product line. During WWII the Solingen factory was destroyed and all the equipment and inventory was lost. After the war the factory was rebuilt and the company resumed operations, but in the early '60s the company was sold to the scissors manufacturer Wiss & Sons, and in the early 70s Wiss sold out to Cooper Industries. At some point Heinrich Boker adopted the Americanised version of his name, Henry Boker and was used as a brand name for the company's products. A vintage smoothing plane of the coffin pattern made by Henry Boker the item is a rare and significant example of vintage woodworking tools used in the manufacture of wooden items.Smoothing Plane Coffin design. Blade marked Henry Bokerflagstaff hill, warrnambool, maritime-museum, shipwreck-coast, smoothing plane, heinrich boker, carpenters tool, cabinet makers tool

A smoothing plane is typically used after the work piece has been flattened and trued by the other bench planes, such as the jack, fore, and joiner planes. Smoothing planes can also be used to remove marks left by woodworking machinery. When used effectively alongside other bench planes, the smoothing plane should only need a handful of passes removing shavings as fine as 0.002 inches (0.051 mm) or less. The work piece is then ready to be finished, or can be further refined with a card scraper or sandpaper. The smoothing plane is usually held with both hands, and used in a similar manner to the other bench planes. Though designed for smoothing, a smoothing plane can be used as an 'all-round' bench tool and for rougher work depending on how it is set up. Being smaller than other bench planes, the smoothing plane is better able to work on smaller work pieces and around obstructions. Since the 1700s wooden smoothing planes have predominantly been 'coffin shaped' wider in the middle and slightly rounded making them more manoeuvrable. It has also been claimed that the coffin design exposes more end grain, enabling the plane to better adjust to changes in humidity. Henry Boker Maker: Heinrich "Henry" Böker of Reimschied-Solingen, Germany and his family was making tools in the 17th century. In 1829 Hermann and Robert Böker added sabres to the company's offerings, in 1837 they emigrated to New York City and established a firm to import German cutlery. H. Boker sabres would be eventually supplied to some American soldiers during the Civil War. Heinrich Boker in 1869 , a relative of Hermann and Robert, established a cutlery firm in Solingen, a centre of industry and cutting tool manufacturing in Germany. The company became a leader in the manufacture of razors, scissors and eating utensils. As early as 1900 the majority of tools produced by Boker were distributed in the U.S. market by the New York branch of the family, and pocket knives became the company's most important product line. During WWII the Solingen factory was destroyed and all the equipment and inventory was lost. After the war the factory was rebuilt and the company resumed operations, but in the early '60s the company was sold to the scissors manufacturer Wiss & Sons, and in the early 70s Wiss sold out to Cooper Industries. At some point Heinrich Boker adopted the Americanised version of his name, Henry Boker and was used as a brand name for the company's products. A vintage smoothing plane of the Bismark pattern made by Henry Boker the this plane is now regarded as a collectors item and is an example of vintage woodworking tools used in the manufacture of wooden products.Smoothing Plane Bismark design. Blade marked Henry Bokerflagstaff hill, warrnambool, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, smoothing plane, heinrich boker, carpenters tool, cabinet makers tool