101.1 Simple Cell : A glass jar 150 x 100 mm with 150 x 50 mm zinc & copper plates with terminals.

101.2 Daniel Cell : Comprises a copper vessel150 x 100 mm with terminal & perforated shelf, thick zinc rod 150 x 12.5 mm with brass terminal & porous pot 140 x 50 mm complete.

101.3 Zinc Rod : For Daniel Cell; 150 x 12.5 height x diameter , fitted with a terminal.

101.4 Leclanche Cell : Comprises a glass container 90 x 90 x 150 mm. Rim shaped to hold the zinc rod to accommodate the cathode, a porous pot containing a carbon rod with terminal with a mixture of powdered carbon & manganese dioxide depolarizer. Requires approx. 500 ml ammonium chloride electrolyte with zinc rod & porous pot but without electrolyte. The cell produces an EMF of about 1.5 volts.

101.5 Porous Pots : available in Dimensions :

101.7 Standard Cell : 'H' form constructed in accordance with the specifications laid down by National Physical Laboratory - India. Platinum wires are sealed into the bases of the limbs & are connected to the terminal at the top of the case. E = 1.0186 V at 20ºC. Mounted in moulded case.

101.8 Worcester Circuit Board : Consists of a base board, complete with terminals, a set of metal connection pillars & a number of clips on flexible connection strips & accessory units; enabling a wide variety of electrical circuits to be constructed quickly & easily. The phosphor - bronze strips are so designed that when flexed a little in the fingers, they are easily slipped over the pass where their natural spring holds them firmly in position & ensures a good electrical contact. Supplied with all the necessary accessories.

101.9 Water Circuit Board : Consists of a large board on which is mounted a low voltage electric pump, connected to a 4 mm socket terminals that circulates the water through the circuit. The circuit is of clear plastic tubing connected to glass tubes of different bores representing resistances. Across the resistances is connected a detachable manometer show the potential difference. Following the resistance is a taper ended tube discharging into a funnel so that the rate of flow representing the current may be shown. Dimensions of the board : 590 x 320 mm approx.; manometer : 275 x 155 mm approx.

101.10 Morse Key : Mounted on wood base, with adjustable pivots, variable spring tension & variable movement. Three terminal posts are incorporated for make or break operation.

101.11 Morse Sounder : An open construction on a wood base with twin coils. Adjustment is provided on the armature spring tension & the movement. Two terminal posts are incorporated.

101.12 Morse Key & Morse Sounder : Both on same board.

101.13 Demonstration Electric Motor : A model of the simplest form of DC motor; having 3 armatures - 2 pole, 3 pole, & 4 pole, wound with enamelled copper wire, & a permanent magnetic field provided by a removable bar magnet. The construction is completely open & all components are readily observable. A disc type commutator is incorporated & external connection to the phosphor - bronze bushes is by means of a pair of 4 mm sockets. The motor shall operate on 4.5 to 9 volts DC.

101.14 Electric Motor with Newton’s Disc : Mounted on a wooden base 90 x 90 x 100 mm, workable on 2 to 4 volt DC with fan blade & Newton’s colour disc.

101.15 Demonstration Electric Motor : Same as 101.13 having 2 pole armature. Main body is one piece of cast aluminium. Operable on 4 to 8 volts DC. Tripolar & Four polar also available.

101.16 Demonstration Electric Bell : Mounted on a wooden base 125 x 250 mm, all parts easily visible, rigid constructions to show the connections on a vertical stand.

101.17 Dynamo Model AC : A simple demonstration of a Dynamo Model mounted on a wooden base of size 200 x 170 mm. Hand driven by a gear. Simplified open frame construction which can be readily understood without detriments to its essential similarity to real machine. A 2 pole armature wound by enamelled copper wire to rotate in U shape magnet in pivot. While in rotation process through the gear wheel by hand, the bulb provided glows.

101.18 Dynamo Model DC : same as 101.17 but DC

101.19 Demonstration Dynamo : This model uses the same basic assembly as the electric motor in 101.15 but is mounted on a base plate 225 x 100 mm which also carries a hand drive pulley 120 mm in diameter coupled to the smaller dynamo pulley by a rubber belt. Electric output is via a pair of 4 mm socket & a light emitting diode is provided as simple output indicator. The model may also be used as motor on a 4 to 8 volts DC supply.

101.20 Dynamo Model AC & DC : A simple dynamo model to differentiate AC from DC. Mounted on a wooden base 300 x 150 x 160 mm approx. Two bulbs are provided for AC & DC current(s). The model is hand driven & when operated, the AC bulb shows flickering light to indicate AC current while the other bulb glows fully indicating DC current.

101.21 Double ‘C’ Core & Clip : Laminated core to form a roughly rectangular core 92 x 56 x 20 mm approx. With a cross section of 20 x 12 mm & is cut across the middle to produce 2 equal ‘C’s. A strong spring steel strip is provided to hold the two halves together.

101.22 Pair of Coils - 120 turns : Each centre hole coil is wound on a plastic former & is provided with 4 mm socketed terminals. The coil fits onto a double ‘C’ core, provides a suitable transformer for operation from a low voltage AC supply. In addition, it provides a useful electromagnet if used on one half of a ‘C’ core. Over all size of the coil 100 x 53 x 28 mm approx.

101.23 Pair of Coils - 2400 turns : Same as 101.22 but with 2400 turns. Used principally as secondary coils with 395, they may also be used for magnetising steel rods using about 20 volts DC through the coil.

101.24 Coil - 240 turns : Wound on a plastic bobbin to fit a standard ‘C’ core. The coil is centre hole & provided with 3 mm socketed terminals. Dimensions 100 x 53 x 28 mm approx.

101.25 Platinum Resistance Thermometer : Enclosed in a borosilicate glass tube 33 cms long, 14 mm dia. Four terminals ( 2 mains, 2 compensatory ) resistance approx. 2.8 ohms. Fundamental interval 1 ohm. Range 0 - 500º C

101.26 Wheatstone Bridge : Two gap type. Mounted on a polished wooden base, with 24 SWG Constantan wire, with brass strips & 4 mm socket terminals for use with either wire or standard 4 mm plugs for galvanometer & other connections. Boxwood scale graduated 0 - 100 cm x 1 mm. With knife edge jockey having terminal.

101.27 Wheatstone Bridge - 4 gaps : Same as 101.26 with 4 gaps & bridging strips.

101.28 Potentiometer - 1 Wire : Slide wire pattern with one wire, 1 meter long, mounted on a polished wooden base with boxwood rule graduated 0 - 100 cm x 1 cm with three socket type 4 mm terminals to enable the apparatus to be used either as a one meter or two meter instrument with sliding jockey.

101.29 Potentiometer - 4 wire : Same as 101.28 with 4 wires of 24 SWG Constantan connected in series to give effective length of 4 meters; with two terminals. With jockey having knife edge press keys type giving accurate contacts & a terminal for connection.

101.30 Jockey Knife Edge : For Wheatstone Bridge & Potentiometers. Metal knife edge mounted in plastic handle, 90 mm long x 12 mm dia with terminal at the upper end.

101.31 Post Office Box : Plug in type. The heavy brass contact blocks are bond to the vulcanite plated by a double nut system. The plugs & lugs are cut to a finer taper & are interchangeable. The plug heads are machine moulded of bakelite. Each resistor is independently mounted with double leads. Accuracy of Constantan coils 0.1% or lower values & 0.5% for higher values. Resistor : the best imported constantan wire is wound on ebonite spools; the method adopted is non inductive & non magnetic. Each resistor is dipped in boiling hot wax. Provided as above with 3 ratio coils of 1000, 100 & 10 ohms. Rheostat arm 15, 000 ohms. Two tapping keys with silver contacts provided for battery & galvanometer in teakwood case with hinged lid. Overall dimensions : 280 x 200 x 175 mm

101.32 Student Kelvin Bridge : The instrument is combined potentiometer & double ratio box. It may be used for measurement for two or more terminals resistance & metallic bars from 1.1 ohms down to 0.0001 ohms & arranged on all rotary dial. The slide wire reads resistance in steps of 0.001 ohms. Knife edged special jockey is provided for accurate contacts, with the help of double ratio box the reading can be made from 1.1 ohms to 0.00001 ohms.

101.33 Potentiometer, Linear : Mounted on a transparent plastic base 90 x 90 x 30 mm with 3 colour coded 4 mm sockets.

101.35 Rheostat Sliding : Same as 101.34 but wound on vitreous enamelled hexagonal steel tube instead of porcelain tube to make it unbreakable.

101.36 Rheostat, Single Tube, Protected : Variable upto 345 ohms at 1.2 A rating for use as a series resistor or a potentiometer. Enclosed type, in metal case with windings on porcelain former 350 mm long x 56 mm diameter; three 4 mm socket terminals & four mounting lugs tapped.

101.37 Resistance Substitution Box : Range 100 ohms to 10 M given by 16 preferred value carbon resistors 100, 200, 470 ohms, 1, 2.2, 4.7, 10, 22, 47, 100, 220, 470 k ohms, 1, 2.2, 4.7, & 10 M ohms. Rating 0.5 W continuous, 1W max. In wooden case 90 x 90 x 40 mm with rotary selector switch having on/off position & a pair of 4 mm sockets & 19 mm spacing on the top panel.

101.38 Auto Transformer : Continuously variable voltage auto transformer, protected type. Comprises a torridly wound transformer with a continuously variable output voltage 0 - 260 volts AC. Steplessly under full load. Input 220 to 240 volts AC, 50 Hz. In stout metal case mounted on a metal base with mains cable.

101.40 Resistance Box : The heavy brass contact blocks are bound to the vulcanite plate by the double nut system. The plugs & lugs are cut to a fine taper & are interchangeable. The plug heads are machine moulded of bakelite. Each resistor independently mounted with double leads. Accuracy of constantan coils 0.1% for lower values & 0.5% for higher values. Fitted in polished wooden box.

 101.41 Variable Plate Condenser : In bakelite box with two terminals in bakelite front panel which is directly calibrated range 25 p.f. to 500 p.f. or 50 p.f. to 1000 p.f.

101.42 Search Coil : The Coil is wound on a moulded plastic ring & mounted on a tubular plated metal handle through passes the 1 meter long flexible leads. Wound with insulated copper wire, the coil has a resistance of 1.8 ohms approx. The mean dia is 34 mm & the number of turns 100 are clearly marked on the coil former. Dimensions : 150 x 40 x 60 mm

101.43 Parallel Wire Current Balance : The apparatus consists of a stout wire loop mounted in a perspex block with a plated brass knife edge pivoted on pillars & with two movable weights, alongwith a small lamp house containing a 12 volts 24 watts SBC bulb. A perspex screen is held vertically in a channel. A copper disc with a hanger which can be suspended from a movable clip on one of the side arms of the loop; a small perspex gauge box is provided; mounted on a polished wooden base. 530 x 200 x 130 mm

101.44 Moving Coil Ammeter : for DC measurements only, accuracy ±2% at f.s.d. scale, 50 mm long with anti-parallax mirror; set at a convenient reading angle in plastic case 100 x 90 x 100 mm. With pair of colour coded 4 mm socket terminals & zero adjustment. Available in ranges from 1A to 15A.

101.45 Moving Iron Ammeter : As 101.44 but moving iron type or AC or DC measurements; accuracy ±2.5% at f.s.d. Available in ranges from 1A to 10A.

101.46 Dual Scale Ammeter : Same as 101.44 with three colour coded 4 mm socket terminals & zero adjustment. Normal internal resistance 0.05 & 0.1 ohms. Available up to 3A & 15A.

101.47 Moving Coil MilliAmmeter : Description same as of 101.44 but in ranges from 1mA to 500 mA.

101. 48 Moving Coil MilliAmmeters & MilliVoltmeters : For DC Milliamp or Millivolt measurements only; accuracy to BS 89 Class index 1.5. Taut band suspension with single linear scale, 63 mm long with centre zero, is housed on projection type transparent plastic case mounted on an inclined base at a convenient reading angle. With pair of colour coded 4 mm socket terminals & zero adjustment. Momentary overload 1000%; can withstand momentary connection across the terminals of a 12 V accumulator. 110 x 82 x 57 mm.
Also available with terminals.

101.50 Moving Iron Voltmeter : For AC & DC measurements. Flush mounting in plated metal case with mounting flange 73 mm diameter at front & wire leads at rear. Range 0 to 15 V.
Also available in Dual Scale & Moving Coil Type Category.

101.51 Moving Coil Galvanometer : Moving coil type for DC use only. Sensitivity approx. 200mA/division, coil resistance 10W scale, 50 mm, long with anti - parallax mirror, is set at a convenient reading angle in plastic case 100 x 90 x 100 mm, with pair of colour coded 4 mm socket terminals & zero adjustment. FSD 1200 mA per division 20mA. Available upto 50mA.

101.52 Spot Galvanometer : Very popular for use as a null detector for potentiometric set up & bridges. Housed in bakelite case with lamp & scale arrangement. Taut band type movement sufficiently shock proof. Alcomax magnet properly aged for high stability. Clamp 150 mm long, easy replacement for lamp. Operates at mains 220 Volts AC or 6 V DC; band switch for 5 shunt powers 1, 1/10, 1/100, 1/1000 & short circuit. Dimensions 220 x 225 x 132 mm approx.

101.54 Multimeter : Low cost moving coil multimeter for AC/DC & resistance measurements, having a knife edge pointer moving over a two colour scale. With 175µA f.s.d. sensitivity. Range selection is by pins. Test leads stay firmly in the terminals. Two 1.5V batteries included.

101.55 Multimeter Digital 3½ Digit LCD : DC voltage upto 1000 V in five ranges; AC voltage upto 750 V in five ranges; DC current upto 10 A in five ranges; AC current upto 10 A in five ranges. Resistance upto 200M ohms in seven ranges

101.56 Multimeter Digital 4½ Digit LCD :

101.57 Contact Key Single : A brass C.P. spring arm with press knob & two brass terminals. All mounted on bakelite base 80 x 55 mm.

101.58 Contact Key Double : A contact arm & three metal studs mounted on a bakelite base with three brass terminals. The centre terminal is common connection to the arm & the other two terminals connected to the other studs.

101.59 Plug Keys :

a) One Way : Two brass blocks 9 mm thick with brass terminals mounted on a 80 x 55 bakelite base. Accurately tapered plug with bakelite moulded top is fitted into the gap between the brass blocks.

b) Two Way : same as above with three brass blocks on a 180 x 52 mm base.

c) Three Way : same as 101.59A with four brass blocks.

d) Four Way : same as 101.59A with five brass blocks.

101.61 Reversing Switch : Rotary brush type switch with phosphor bronze contacts. Screw terminals. Maximum current 10 A mounted on an insulating base. Dimensions 100 x 100 x 70 mm.

101.62 Charge & Discharge Key : Used in charging & discharging of a capacitor. C.P. brass strips & pillars. Three terminals fitted on a thick bakelite plate of high insulation. Contact resistance 2 milliohms approx. Maximum current 5 amps. Dimensions : 185 x 15 x 45 mm

101.63 Commutator Pohl’s : Used in experiments on Hysterisis. Six cups for mercury in bakelite tray. Six terminals for connections & an insulating handle. Maximum current 5 amps. Dimensions 140 x 140 x 80 mm

101.64 Spade Terminal Adapter : To convert ordinary screw terminals for use with 4 mm plug connectors. This adapter consists of a standard type of spade terminal integral with an insulated 4 mm socket connector. A transverse 4 mm connection hole is also provided enabling two connections to be made to the adapter. In red & black colours.

101.65 Insulated Socket Terminal : With moulded captive head, 4 mm socket, nuts & washers. The screw top will clamp ordinary connecting wires & spade terminals. Available in red & black colours.

101.66 Socket for Banana Plugs : 4 mm moulded hard plastic body, threaded with fixing plug. Plated brass insert with solder pin. Requires 8 mm diameter panel hole. Maximum panel thickness 12 mm. Available in Red, yellow, black & green colours.

101.67 Stacking Plugs : 4 mm with screw connections for leads, longitudinal & transverse 4 mm holes for extra plug connections, hard plastic insulating body. Available in Red, Yellow, & Black colours.

101.68 Crocodile Clips : With strong spring & clamping screw for wire.

101.69 Plug Leads : 4 mm plugs connected by a length of flexible, plastic insulated copper wire. Plugs are stackable. Available in red, yellow, & black colours & in length 300, 500, & 1000 mm.

101.70 Flashlamp Bulb : With MES cap, suitable for flashlamps, spotlights, & panel lamps etc.

101.72 Festoon Bulb : 12V 3V for use with smoke cell & multiple light source.

101.73 Lamp Holder M.E.S. : To take flashlamp bulbs, moulded plastic base with two screw connections.

101.74 Lamp Holders, Mounted : S.B.C. double contact brass lamp holder mounted on rectangular base, with two 4 mm socket connections. 100 x 60 x 60 mm.

101.75 Copper Wire, Bare : Copper wire of 125 gms each spool of the following S.W.G. :

101.79 Cathode Ray Tube : Deflection Effect : to demonstrate the deviation of cathode ray by means of a magnet. Cathode Ray is deflected under influence of magnet , when a magnet or a discharged rod is brought near the tube. On a bakelite base.

101.80 Cathode Ray Tube with Butterfly : Tube bulb shaped with a bulb & flower. The tube glows on impact of reflected cathode rays, to show reflection of cathode rays. On a bakelite base.

101.81 Semiconductor Units : In simplified form, to demonstrate practical applications of semiconductor properties. Each unit is mounted on a transparent plastic base 95 x 95 x 25 mm with electrical connections with 4 mm sockets.

101.82 Mini Motor Unit : With sub miniature DC motor mounted on base; with plastic pulley for attachment of cotton thread in mass lifting experiments. Maximum safe input 2V at 200 mA.

101.83 Helmholtz Coils : Provide a substantially uniform field at the centre space. Each coil has a moulded plastic former 152 mm in diameter with 320 turns of 22 SWG enamelled wire giving a mean diameter of 136 mm. The rod has a sliding boss which locks into the tapered hole in the universal stand. Dimensions of Coil & support rod 305 x 152 x 25 mm. Supplied with instructions.