Physics > Mechanics > Weather

Comprising a metal funnel 125 mm diameter Overall length 250 mm with an inner receiving cylinder 220 x 70 mm (Length x dia) a cylindrical outer body length 300 x 125 mm diameter and a glass measuring jar graduated 0 to 10 mm x 0.1 mm (100 divisions)

Sixs, Dual scale thermometer, spirit in glass thermometer with indicating thread mercury and two cursors, mounted on dual scale - 20°C to + 50°C x 1°C and - 20° F to 120° x 2°F, metal/plastic base plate, with magnet.

Red spirit filled, mounted on wooden/plastic base plate

Range- 20°C to + 50°C x 1°C, -20°F to 120°F x 2°F.

A. On moulded plastic base plate.
B. On wooden/aluminium base plate
C. Half meter on wooden base plate.
D. Half meter on plastic base plate.

This screen is to shield thermometers from precipitation and direct radiation from external resources, while it allows air to circulate freely around thermometers. Thus a near uniform temperature enclosure is created at the same temperature as of outside air.

This has louvered white painted hardwood, (white paint helps to reflect radiation) to accommodate wet and dry bulb Hygrometer and maximum and minimum thermometers etc. It has ventilation from beneath with louvered doors supported by two chains. Internal dimensions 450x400x240 mm Ht x width x depth.

Designed to produce maximum torque relative to its moment of inertia as for a given change in wind direction, it is rotated with the minimum of friction and is balanced to avoid bias towards any particular direction. Balanced vane with bearing mounted on steel pivot pillar terminates in 2.5 cm. BSP (Male) thread. Complete with locking nut, fitted with four arms with N.E.W.S. Overall size 40x40x40 cm. (Approx), All parts can easily be assembled for use.

Economical Model, to determine wind velocity. Consist of four half round cups, one of them of different colour, revolves freely on vertical pivot.

A portable, hand held cup anemometer which gives direct reading of wind speed in either km/hr, or Beaufort scale, m/s or knots. The vertical spindle carries three plastic cups, which rotates on ball bearings and cause the deflection of two pointers across the paired scales.