Education Science International

glass, cylindrical with tubulure at base.

GLASS, WITH ONE BULB AND TUBE FOR BENDING, LENGTH EXCLUDES NARROW TUBE.

GLASS WITH SIDE ARMS AND INTERCHANGEABLE STOPPER.

glass, in u shaped.

plain ends, with side arms

comprises of two adjustable brass plates 100 mm dia with insulating handle and a glass dielectric plate on wooden base.

IT IS SUITABLE FOR USE WITH MAGDEBURG HEMISPHERE AND BELL JAR EXPERIMENTS. PLATE DIA 150 MM. IT IS FITTED WITH STOPCOCK AND IS MOUNTED ON A BASE.

FOR LABORATORY APPLICATION ,INCLUDING SEALING BOTTLES,CULTURE TUBES,ETC REDUCING EVAPORATION OR HEAT LOSS,COVERING CORKS,MAKING WEIGHING BOATS OR DISHES ETC.

ASPIRATOR BOTTLE WITH STOP COCK

MADE OF PP,AUTOCLAVABLE.
ALSO AVAILABLE SPARE STOP COCK.

ASPIRATOR BOTTLES, WITH OUT LET FOR TUBING

GLASS CONSTRUCTION

SINE & SQUARE WAVE OUT PUT .
0-30 V P-P SINE.
0-15 V P-P SQUARE.
RANGE - 1 Hz TO 1 MHz.

STAINLESS STEEL,SEAMLESS DIE PRESSED BODY,LID FLANGE FLY SCREWS,CROSS PINS, HEATER COVER X-STAND,LID FITTED WITH PRESSURE GUAGE SAFETY VALVE,EXTRA FUSIBLE PLUG AND MANUAL EXHAUST VALVE
SIZE : 20 X 18CM DIA X DEPTH WORKING.
SIZE : 30 X 23 CM DIA X DEPTH WORKING.

DOUBLE CHAMBER,FLY SCREW, CROSS PIN,FLANGE AND DIE PRESSED LID ARE FULLY STAINLESS STEEL. LID IS FITTED WITH PRESSURE GUAGE,SAFETY VALVE ,EXTRA SAFETY VALVE , FUSIBLE PLUG,MANUAL EXHAUST VALVE AND VACCUM BREAKER,DRAIN VALVE AT BOTTOM,MOLDED NEOPRENE GASKET.SPECIALLY DESIGNED ENERGY EFFICIENT HEATERS .
POWER SUPPLY 240V AC 50HZ SINGLE PHASE.

for charging batteries. In metallic case with ammeter,awitch for 6v / 12v charging,with output fuse and indicator lamp. Complete with battery terminals and main cable. Operates on 230 volts
50hz.
avalable in 2 , 4 & 6 amps.

also avalable in other ranges

mounted on a wooden base with two sets of pulley driven by crank for fast or slow motion . When driven at fast speed the bulb glows . Two 4 mm sockets provided in parallel with the lamp .

to demonstrate the expansion of water on freezing . Bottle of cast iron 100 x 25 mm approximately,which can be sealed by means of a squar-shanked iron stopper screwed.

to provide intense source of illumination . It consists of a well ventilated metallic housing with two shuttered holes giving access to coiled filament transversely or end on so as to use it as a line source or point source. Bulb fitted is a tungsten halide projector lamp , 12v 100w. A side support rod of 13 mm dia is fitted.

MADE OF BRASS,METAL CIRCLE GRADUATED TO 0.5 DEG , WITH SYNTHETIC SAPPHIRE BEARING AND AUTOMATIC LIFTER , SLIDING LENSETIC PRISM ,WITH COLOURED GLASSES,REFLECTING MIRROR ,PACKED IN LEATHER SLING CASE.

brass tube flush-jointed with polished wood cylinder.

to demonstrate pressure of the atmosphere . Thin tin metal cylinder with screw cap 240 x 76 mm (h x dia ).

COMPRISING A STOUT BAKELITE BOX 100 MM DIA , WITH ALUMINIUM DIA GRADUATED IN DEGREES 0 - 90 FOUR TIMES, ANTI PARALLAX MIRROR SLOT AND REPLACEABLE STEEL PIVOT. THE SHORT MAGNETIC NEEDLE HAS A JEWEL BEARING AND A LIGHT ALUMINIUM POINTER DESIGNED FOR PRECISE READING AND MAXIMUM DAMPING.ONE METER LONG SINGLE PIECE WOODEN POLISHED BASE WITH EMBEDDED TWO HALF METER SCALE READING FROM THE CENTRE OF COMPASS BOX ( MAGNETOMETER ) i.e. ZERO AT CENTRE OF BOTH THE SCALE AND LEVELLING SCREW.

STRONG MAGNETISED COBALT STEEL NEEDLE WHICH ROLLS ON KNIFE EDGES , A VERTICAL SCALE GRADUATED IN DEGREES DIVIDED IN FOUR QUADRANTS , EACH RANGING FROM 0 TO 90 DEGREE . HOUSED IN A CASE WITH GLASS ON BOTH SIDES , HINGED DOOR AND A SPIRIT LEVEL . IT ROTATES ON A TRIPOD FITTED WITH LEVELLING SCREWS.THE LOWER HORIZONTAL GRADUATED SCALE IS DIVIDED IN 360° AND READS BY A VERNIER TO 0.1 ° .

TO DEMONSTRAT THE CONVERSION OF MECHANICAL ENERGY INTO ELECTRICAL ENERGY OR VICE-VERSA . 6 TO 9 VOLTS INPUT IS REQUIRED . A LOW VOLTAGE LAMP IN A HOLDER WITH 4 MM PLUGS FOR OUT PUT INDICATION , MOUNTED ON BASE WITH DRIVING PULLEY , CONNECTED TO THE SMALL DYNAMO PULLEY.

IT WORKS ON 3 TO 6 VOLTS D.C. , MOUNTED ON A BASE ALL PARTS ARE CLEARLY VISIBLE.

A STEEL WIRE WITH A HOOK ON ONE SIDE IS MADE TO PASS THROUGH SOLENOID AND A HORSE SHOE MAGNET. WHEN 220 VOLTS A.C. CURRENT IS PASSED THROUGH THE SOLENOID THE STEEL WIRE REVERSE WITH EVERY CHARGE OF A.C CURRENT DIRECTION AND VIBRATES WITH THE FREQUENCY OF A.C. MAINS. THE FREQUENCY IS CALCULATED AS IS DONE IN MELDE'S APPARATUS. IT CAN ALSO BE USED TO MEASURE THE CAPACITY OF A CONDENSER BY APPLYING THE FORMULA C=1/Vf , WHERE C IS THE CAPACITY OF THE CONDENSER ,THE MICROAMETER CURRENT . V THE MAIN VOLTAGE AND F THE FREQUENCY.

A STRONG U SHAPED MAGNET , LIMB LENGTH 100 MM ,WOUNDED WITH INSULATED COPPER WIRE , 4 TO 6 V D.C. SUPPLY .

for demonstration of pressure gradient along a uniform bore tube. Tapered glass vessel 110 mm long with spherical glass float and right angled inlet and outlet tubes. Complete with pressure gradient tube 650 mm long,with four 65 mm long side tubes for connection to manometer tube. Complete with tubing for connecting manometer tubes to the gradient tube .

same as above with an additional facility of digital read out.

moving coil , d. C. In plastic case , diameter 65 mm , fitted on stand with 4 mm socket terminals , scale 50 mm.
accuracy ± 2% f. S. D.
scale : 25-0-25
. . . . . . . . . . : 35-0-35
. . . . . . . . . . : 50-0-50 .

to detect the presence and direction of electric currents by the deflection of a magnetic needle . It consists of an insulated former with terminals , circular scale marked at 4 quadrants with 30 turns of enamelled copper wire and a magnetic needle provided at the center.

METAL CASE ,LID FINGER RIBS FOR REMOVAL , WITH EARTHING SOCKET AND SCALE WITH GLASS SIDES TO SEE THROUGH.

comprises of a primary coil of insulated copper wire wound upon cylinder made of non-conducting material with terminals , secondary coil wound upon another cylinder into which primary fits. A soft iron core fits into the cylinder of the primary. Complete with terminals.

used for producing high potential difference and approximately unidirectional current by electro magnetic induction. Spark length 50 mm usable on 8 to 10 v d. C.

A MAGNETICALLY DAMPED , SPRING - CONTROLLED MOVING COIL MOVEMENT WITH A POINTER , 140 +/- 5 MM LONG HAVING A SPADE-SHAPED END IS HOUSED IN A WOODEN CASE 220 X 110 X 280 MM HIGH WITH GLASS FRONT AND REAR PANELS TO ENABLE ALL WORKING PARTS TO BE CLEARLY SEEN.WITH PAIR OF 4 MM SOCKET TERMINALS AND SIDE ZERO ADJUSTMENT CONTROL. THE SCALES, 130 MM LONG ARE BOLDLY MARKED AND FIGURED ON BOTH SIDES SO AS TO BE CLEARLY VISIBLE TO THE CLASS FROM THE FRONT AND TO THE DEMONSTRATOR FROM THE REAR. EACH SCALE IS FITTED THROUGH A SLOT IN THE SIDE OF THE CASE AND HAS A PLUG CONNECTOR WHICH ALSO SERVES TO LOCATE AND ALIGN THE SCALE POSITIVELY IN POSITION. BASIC SENSITIVITY OF THE METER IS 5 MILLI-AMPEAR f.s.d. THE METER CAN BE USED FOR DEMONSTRATION OF A.C. OR D.C. AMMETER OR VOLTMETER WITH THE INTERCHANGEABLE SCALES.

INTERSCALE DIALS : ALL INTERSCALE DIALS CARRY WITH THEM THE NECESSARY ACCESSORIES FOR CONVERTING THE METER TO THAT PARTICULAR RANGE OR FUNCTION.

non-magnetic pillar with steel point on a stable base with magnetic needle.

comprises of a helical coil of insulated copper wire ,mounted on a base , supplied with iron rod , one meter of lead wire and fuse . For use on 230 v ,ac supply.

strong , with keepers . Length 50 , 75 , 100 mm. Standard.

STRONG FIELD ,MARKED N AND S , FINESHED IN BLUE & RED COLOUR WITH KEEPERS , LENGTH , 75 , 100 , 150 & 200 MM. STANDARD.

metal strip set: set of 12 metal strips of magnetic and non magnetic materials,comprises of aluminium , brass , cardboard , copper , acrylic , polythene , steel , wood , zinc , lead & paper.

oscilloscope , 20 mhz dual trace

features :
* two simultaneous sampling channels at 20 ms/ s
* combination of a true dso and an analog oscilloscope one touch change over.
* 2 kilo words of memory storage/channel
* crt readout and cursors for voltage time and frequency measurement
* direct print out of screen display using hpgl commands with rs-232 interface.
* ruggedised environment endurance.
* 1mv/div sensitivity.
* two input channels, algebraic add and subtract with ch2 invt.
* a sweep
* b sweep ( delayed sweep ), triggered.
* x-y operation
* read out / cursor
* menu selection , data acquisition for probe factor, smooth on/off
* pre-trigger observation
* single sweep operation ( storage band width 5 mhz )
* x2 to x10 horizontal expansion in digital mode
* temporary holding wave forms displayed
* storing and recalling a reference memory
* scale illumination
* continuous variable hold-off
* z- axis input
* large inch crt with internal graticule
* tv-v,tv-h triggering
* calibrator out put for probe adjustment

FOR REFLECTING AND FOCUSING RADIANT HEAT.COMPRISING TWO 250 MM DIA HIGHLY POLISHED METAL REFLECTORS MOUNTED WITH A SCREW CLAMP ON A ROD WITH TRIPOD BASE.

for demonstrating various class experiments related to pin hole camera. Comprises of 8 preformed black card board camera boxes with outer sleeves, 3 sheets of translucent paper 20 x 33 cm , 50 sheets light proof black paper 20 x 25 cm , 1 lamp 230v-200w , 1 lamp holder with leads , 1 box of assorted steel pins, 1 reel of cellulose tape. Assembled box measure 15 x 10 x 10 cm and each has a circular hole,3. 8 cm diameter at one end and a hole 6. 4 cm square at the other . The latter is closed by means of the translucent sheet.

it consists of a wooden base with brass blocks, fitted with 4 mm socket terminals and a 100 cm wooden scale. A knife edge jockey is also supplied.

IN TRANSPARENT CASE : RANGE 0.1 TO 500 ohms , NON-INDUCTIVELY WOUND WITH TWO TERMINALS. RESISTANCE OHMS 0.1 - 500.

ROUND BAKELITE :TWO TERMINALS ,CONSTANTAN COILS , 0.1 TO 1000 OHMS.

RECTANGULAR BAKELITE :TWO TERMINALS , MAGANIN COILS, 0.1 TO 1000 OHMS.

RECTANGULAR BAKELITE :FOUR TERMINALS , MAGANIN COILS, 0.1 TO 1000 OHMS.

STANDARD RESISTANCE : OIL FILLED,ROUND BRASS,MANGANIN COILS, 0.001 TO 1000 OHMS .

for use as series resistance or potential divider. Comprises of insulator tube,wounded oxidised eureka wire mounted on bakelite feets , with laminated brush contacts of phosphor bronze strip,nickel plated rod & 4 mm socket terminals.

used to observe dispersion of light.

metal cylinder to demonstrate that pressure increases with the depth . With three spouts of same size at different heights vertically aligned.

MAGNETO METER SUPPORTED ON BRASS TUBE FITTED ON BAKELITE PLATE IS FREE TO REVOLVE IN THE BASE OF THE INSTRUMENT , MAGNETO METER AND BAKELITE RING BOTH CAN ROTATE INDEPENDENTLY OF THE BASE , FITTED WITH LEVELLING SCREWS. COMPSS BOX , CONSISTS OF A BAKELITE CASE WITH METAL DIAL GRADUATED IN DEGREES AND ANTI PARALLAX MIRROR.COBALT STEEL MAGNET AND ALUMINIUM POINTER MOUNTED ON SPECIAL SYNTHETIC SAPHIRE , NEEDLE MOVES ON HARDENED STEEL PIVOT.RING DIA 162 MM ,WINDING 2 , 50 & 500 TURNS.

used for sudden make or break of electrical circuits mounted on a bakelite base with terminals.

available : one way . . . . . . . Two way.

frequency : 1 hz to 100 khz continously variable in 5 decades
output impedance : 600 ohms.
dial accuracy : +/- 3% +/- 1°
output amplitude : 0-10v (ptp) in decade ranges
power supply : 230 v , 50 hz , 7 watts
dimension : 29 x 15 x 9 cm (l x b x h )

moving coil , d. C. In plastic case , diameter 65 mm , fitted on stand with 4 mm socket terminals , scale 50 mm. Accuracy ± 2% f. S. D. Range : 0 - 1 to 600 v.

moving coil , d. C. Transparent acrylic cover , dial,on stand with 4 mm socket terminals, scale 60 mm. Accuracy ± 2% f. S. D. Range : 0 - 1 to 600 v.

milli voltmeter range : 0 - 1 mv
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : 0 - 25mv
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : 0 - 60 mv
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : 0 - 1000 mv

also available dual range meters
also available a. C. Voltmeter , ammeter & milliammeter ( rectifier type )