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عرض 91–105 من أصل 1964 نتيجة
Clear plastic, approx. 600 x 200 x 75 mm for use in wave motion and ray optics demonstrations.
Consists of a thick brass calorimeter 90 x 65 mm, a bung with steam inlet and outlet tubes, a felt cover and a one liter brass sheet boiler with bung to take the steam tube.
For poor conductors, 3 cylindrical blocks of Copper 50 mm diameter 12.5 mm thick, with radial holes for thermometers, are clamped in a wooden frame by a screw, with 2.5 W, 6 V heating element and a set of 3 bad conductor discs.
Wooden, with V shaped slot to take spherical lens or mirror up to 75 mm diameter, with index mark.
With 6 mm diameter Metal rod, to fit into standard optical bench mounts and stands.
Metal holder with sides grooved to hold lens up to 50 mm diameter on wooden support.
V-section, to accommodate any lens or mirror up to 75 mm diameter.
Clear glass, ground edges.
75 mm long, 115 mm radii, 25 mm thickness
Clear glass, ground edges
Glass, one each double convex, Plano – convex, concavo – convex, convexo – concave, Plano – concave and double concave lens, in box.
Consisting of a galvanized iron box of 130 mm sides. The vertical faces are blackened dull, blackened bright, white and polished respectively, with a tubule at top for thermometer. Supplied with thermometer.
To illustrate principles of lever and moment, five plywood beams 600 x 44 x 3 mm with ruled graduations at every 38 mm and a shallow groove across its centre for fulcrum point, with 4 wood fulcrums and forty 25 mm square metal blanks.
