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GP-553.1 MILLIKAN’S OIL DROP The apparatus comprises the following: THE CONDENSER: The specially designed condenser consists of two horizontal brass plates 5cms square. The plates are separated by insulating spacers having a separation of 4.5mm. The upper plate perforated at the centre for passage of oil Drops into the observation chamber is fitted to the lower plate by 2 ebonite shrouded screws to facilitate opening of the condenser for cleaning. The condenser is provided with two slits, one for viewing the droplets and the other for projection of light. CONDENSER BOX: For completely eleminating the disturbances due to air currents, the condenser is now housed in a transparent perspex box 9x6x5cms(LxWxH) with a removable lid. A sensitive circular spirit level is fixed to the instrument. The condenser unit is mounted on a pillar, fitted to a massive cast iron base with levelling screws. At the centre of the box lid a hollow cylinder is mounted. The oil is sprayed through the cylinder, which can be closed by a piston. The box is fitted with two terminals, having connections with the condenser plates for H.T. Supply. LAMP HOUSE: A metal case with a 6 V incandescent bulb is mounted on a fixed arm. fitted to the pillar of the instrument. Light is projected to the field of view for illuminating the droplets. THE TELE-MICROSCOPE: Instead of a microscope the instrument is now fitted with an extra powerful short focus tele microscope. The magnification of Tele-microscope in respect to it’s objective is I, thus making it DIRECT READING i.e. the exact distance travelled by the droplets can directly be read on micrometer scale. The Tele- microscope is fitted with achromatic objective, ramsden eye piece and a micrometer scale of 0.1mm. The Tele-microscope is fitted with micrometer screws for it’s precise adjustment is horizontal & Vertical plane. THE SWITCH: A specially designed switch for off and on the charge and for reversing the polarity of the condenser plates, is fitted on the base. The switch is fitted with four terminals for CONNECTIONS. Finished in Tilden Gray and Bright Chrome the instrument is supplied with instructions for use and complete with Atomizer. Oil and 8 extra glass plates. WITHOUT POWER SUPPLY. Select Item Description Type Accessories .01 Regulated power supply 0 to 300 Volts. .02 Power supply 0 to 500 V with intensity control arrangement. .03 Atomiser for a forceful spray for the best charged droplets. .04 Spray oil (water free) non volatile bottle of 150g. Page : 1 |