Plug Switch, One Way (DI-288-A) Two brass blocks with 4mm insulated terminals are mounted on a moulded base, an accurately tapered plug with a fluted top fits into the tapered hole between the two blocks, ensuring very low contact resistance.     Plug Switch, Two Way (DI-288-B) With three brass blocks, each with a 4mm insulated terminal and two standard tapered plugs to fit the two holes between the blocks       Contact Key, Single (DI-298) A spring arm , press knob, contact stud and a connecting strip with two 4 mm. terminals on plastic base of 100 x 60 mm. size.     Spot Galvanometer(DI-242/43) High sensitivity, very useful as null detector. Housed in sturdy plastic case with in-built lamp and scale arrangement, taut band type movement, with Alcomax magnet, clamp and free arrangement for safe transportation, easy replacement of the 6V lamp, working on 220V a.c. with internal transformer. With a rotary switch for selecting any of the five shunt powers 1, 1/10, 1/100, 1/1000, and short circuit. Galvanometer resistance :125 ohms Current per mm deflection :5 x 10-8 Volts per mm deflection :6.25 x 10-6 Critical damping resistance :1000 ohms     Knife Switch (DI-300) Low voltage, moulded base with plated contacts and screw connections. - Single Pole Single Throw - Double Pole Double Throw       Demonstration Meter(DI-240/41) With interchangeable scales. A versatile instrument and demonstration meter that can be converted to an a.c., or d.c. voltmeter or ammeter with selection of various ranges for each mode. With a high quality moving coil, spring controlled movement with full scale deflection of 5 mA or 100 mV d.c.The long pointer has a spade end and is clearly visible from a distance.Fitted in case with glass front and back. The instrument can be used with different dials to give different voltage and current ranges.All dials are interchangeable and each has a plug coupler to fit the instrument. The coupler connects appropriate resistors, shunts or rectifiers to convert the instrument to the range as given on the scale of the particular dial. The scales have clear bold figures and are marked on both sides to enable the lecturer also to observe the reading from the back of the instrument. A zero adjuster allows the instrument to be used for centre zero dials.One dial of range 50-0-50 mV d.c. is supplied with the instrument.     POWER SUPPLY, E.H.T The unit provides a continuously varible E.H.T output from o to 5 kV d.c. with a low voltage output of 6.3 volt d.c. and is ideal for vacuum tubes etc. This unit uses a low voltage transistor inverter circuit and E.H.T. transformer. The high a.c. voltage is rectified and smoothened. A meter calibrated 0 t0 5 kV is connected to control the output voltage. Output : E.H.T.-0 to 5 kV d.c., continuously variable. Terminal output voltage indicated by meter. Max short circuit current is safely at 3 mA. A heater supply 6.3 V a.c. at 4 A is fully isolated & insulated for 5 kV. Protection : Mains 500 mA antisurge fuse, Output overload protected, E.H.T. max current limited to 3 mA.     POWER SUPPLY, Continuously VARIABLE, 25V Gives continuously variable a.c. and d.c. outputs upto 10 A for a.c. and 8 A for d.c. A meter is provided to indicate both a.c. and d.c. voltages. An internal fuse is provided for input and a resettable cut-out for output. With detachable 1.5 metre mains lead. Specifications: Mains Input :220-240 V a.c. 50/60 Hz Output Voltages :0 to 25 V a.c. and unsmoothened full wave rectified d.c. Output current :10 A maximum a.c.: 8 A maximum d.c. Voltage Selection :Rotary continuously variable transformer operated by a large knob on front panel. Metering:A.c. and d.c. output voltages by a moving coil meter with selector switch to select a.c. or d.c. Circuit protection :Mains input 3 A internal glass fuselink. Output is protected by a resettable cut-out. Output terminals :Colour coded 4 mm sockets. :: TOP :: | Mechanics | Electricity | Magnetism | Sound | Electronics | Electrical Accessories | Vacuum Apparatus | Heat | Electrostatic | Optics | Chemistry | Fiber Models | Microscopes | Corks |

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