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THERMOMETER WALL (0660)
Spirit filled thermometer with bulb guard and clear black markings. Double scale, graduated -20 to 50 x 1?C and 0? to 120 x 2?F, length approx. 380mm.
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HYGROMETER. WET & DRY BULB, MASON'S (0661)
Comprising two thermometers tubes with double scale graduation, mounted on a weather-proof case with shade. Scales graduated -10 to 50 x 1?C and 20 to 120 x 2?F. One thermometer kept dry and other has bulb covered with muslin or wick, dipped into a water reservoir, which keeps it wet during long periods of non-use. Comparing the reading of wet and dry thermometer from the humidity and temperature conversion chart included, relative humidity can be worked out.
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HYGROMETER, WET & DRY BULB (0662)
Similar to HYGROMETER. WET & DRY BULB, MASON'S but of superior quality plastic scale.
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WHIRLING HYGROMETER (0663)
The ventilated type of hygrometer gives greater accuracy for humidity demonstrations and is particularly useful for measuring local differences in humidity. There are two thermometers mounted inside a case, fully enclosed to prevent breakage, one dry and other having a wick dipping into a water reservoir at the end of the frame to keep it wet during long periods of non-use. The thermometers are stem engraved with lens fronts for easy reading, range -5 to 50 x 0.5?C. Includes humidity and temperature conversion chart.
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HAIR HYGROMETER (0664)
Circular dial type hygrometer with scale 0 to 100 x 1% RH (Relative Humidity). In metal case.
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RAIN GAUGE. BRITISH ASSOCIATION PATTERN (0665)
It consists of a sheet metal funnel about 250 x 125mm (overall length x diameter), with an inner receiving cylinder 200x70mm (height x diameter), a cylindrical outer body 300x 125mm (height x diameter). and a measuring jar.
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RAIN GAUGE, BRITISH ASSOCIATION PATTERN, COPPER (0666)
All sheet metal construction of copper provided added durability to the apparatus. Similar to RAIN GAUGE. BRITISH ASSOCIATION PATTERN comprises a 125mm funnel, an inner receiving vessel and outer body, all of copper, along with a glass measuring cylinder graduated 0-10mm x 0.1 mm (100 divisions).
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RAIN GAUGE, SYMON'S, GI (0667)
It consists of a cylinder made from galvanized iron sheet with a funnel made from metal sheet with brass collar, which fits and drains into an inner cylinder. When the inner cylinder fills, the vessel collects the overflow.
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RAIN GAUGE SYMON'S, COPPER (0668)
Same as RAIN GAUGE, SYMON'S, GI but all sheet metal components made of copper. instead of Glsheet, duly polished.
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WIND VANE, BALANCED (0669)
A simple device for determining the direction of flow of wind. Comprises a large arrow mounted on a metal rod with bearing and mounted on top of steel pivot that aligns itself along the wind. Complete assembly mounted on a metal pillar that carries four arms terminating in the compass cardinal point symbols marked NEWS.
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WIND VANE, ECONOMICAL (0670)
Similar to WIND VANE, BALANCED but simpler and economical version mounted on stand.
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ANEMOMETER, HAND HELD (0671)
A portable. hand held, cup anemometer which gives direct readings of wind speed in either km/hr, Beaufort scale. m/s or knots. The vertical spindle carries three plastic hemispherical cups, which rotate on ball bearing and cause the deflection of two pointers across the paired scales. The anemometer has a handle and two coned feet to prevent damage to cup when it is laid down. With scale 0 to 120 km l hr, 0 to 12 Beaufort, 0 to 35m/s and 0 to 60 knots.
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ANEMOMETER, ROBINSON CUP TYPE (0672)
Useful for determination of wind speeds. Comprises three light-weight hemispherical plastic cups attached to a central hub through lightweight spokes. Speed of rotation of these cups calibrated on an analog moving coil meter directly to give the wind speed.
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ANEMOMETER, SIMPLE (0673)
Useful for determination of low wind speeds. This Robinson's cup anemometer comprises 4 lightweight, plastic. hemispherical cups mounted at the end of lightweight metal spokes and attached to a central hub. The hub pivoted on metal shaft on top of a vertical support rod on a stable base and is capable of rotating freely about vertical axis. Three cups are black and one red to facilitate counting of rotations per unit time.
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ROCKS COLLECTION SET (0674)
A comprehensive collection of a range of igneous, metamorphic and sedimentary rocks. Each specimen properly named and numbered.
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