Tender For Purchase Of Lab Equipments-Supply Of Physicslab Equipments, tirur-Kerala

Supply Of Physicslab Equipments-Purchase Of Lab Equipments Purchase Of Lab Equipments For Physics Lab , Lab Equipments For Physics Lab , Mercury Vapour Lamp Bulb- 125Wbc Nom Lumens 6000 250V ( For Optical Spectrometer Experiments ) Bulb Only , Sodium Low Pressure Vapour Lamp Bulb- 35W ( For Optical Experiments Spectrometer Experiments ) Bulb Only , Hares Apparatus:- Three-Limbed Glass Tube, With 250Mm Of Rubber Tubing On The Centre Limb, Mounted On A Stand With A Scale 61Cm Long With The Zero At The Bottom. , Glass Burette- Borosil 50Ml Straight Bore Burettes With Stopcock, , Compass Box For Deflection Magnetometer:- Consisting Of A Circular Bakelite Box With Aluminium Dial Of About 100Mm Diameter, Having Circular Scale Graduated 90º-0-90º-0- 90º, Divided In Four Quadrants. Magnetic Needle Is Mounted On Hardened Steel Pivot For Smooth Movement. With Anti- Parallax Mirror Slot , Step Down Transformer ( With Centre Tap ) - 6-0-6 ( 230 To 6V ) Input Voltage:230Vac Output Voltage: 6V, 6V Or 0V Output Current: 3 Amp Mounting: Vertical Mount Typeprovision For Connecting To Secondary Coils And Centre Tap To Circuit , Newtons Ring Complete Experimental Set Up- Includes Travelling Microscope, Inclined Glass Plate Setup Focusing Lens, Excluding Sodium Vapour Lamp Setup , Scale And Telescope Arrangement- The Telescope Should Be Mounted On A Specially Designed Carriage With Support Ring To Stop Abrupt Falling. The Carriage Should Be Fitted With Two Adjustable Screws For Precise Vertical And Horizontal Positioning. The Whole Arrangement Mounted On A Long Steel Pillar, Fitted On A Cast Iron Base With Leveling Screws. A Scale Holder With Scale Should Also Be Fitted Vertically On The Steel Pillar. ( For Static Torsion Experiments ) , Ammeter Range 0-1A - Dc Analogammeter 0-3A Amperes For Lab Desk Stand Type Moving Coil For Use In Scientific Laboratory Education Purpose , Ammeter Range 0-500Ma- Dc Analogammeter 0-500Ma Amperes For Lab Desk Stand Type Moving Coil For Use In Scientific Laboratory Education Purpose , Galvanometer- Dc Galvanometer Analog For Lab 30-0-30V Portable, For Detecting And Indicating An Electric Current In Experiments Related To Science , Kater’S Pendulum Full Apparatus Set- Black And Silver , Jockey ( Sliding ) - For Potentiometer Experiments, Steel Or Iron Make, High Quality , Plano Convex Lens-For Newtons Rings Experiment ( F=100Cm ) , Convex Lens- ( Exact Focal Length ) Dia 2 Fl 25Cm, Convex Lens ( Exact ) , Optical Spectrometer -6 / 7” Least Count 30’ , Meldes String- Full Experimental Set Up -With Electrically Vibrating Strip Tied To A Thead With Bulb, Clamp, Pan And Weights .Electrically Maintained Tuning Fork, *Melde’S Coil, *Thread, *Scale Pan Pulley On Stand, , Mirror Strip - ( Used For Scale And Telescope Static Torsion & Optic Lever Experiments ) , E / M By Thomson Method Full Setup - A. High Voltage Power Supply With One Digital Meter Provided To Measure The Deflection Voltage. Complete With Separate Intensity, Focus And Deflection Controls.B. Crt- 3Bp1 Mounted On Teak Wood Frame C. Graduated Teak Wood Platform To Place Magnets At The Height Of Deflection Plates. D. Two Small Magnets E. Deflection Magnetometer Compass Box.Complete In All Respects With Working Manual. , Function Generator: ( For Cro Experiments ) - Sine, Square, Triangular And Pulse Wave Forms Frequency Range: 1 Hz To 5 Mhz ( 3% Accuracy ) Output Voltage: 10 Mv To 20 V Output Socket- Bnc Input Power: 220 - 240 V, 50 / 60 Hz Accessories Required: Power Cord For Input Power, One Pair Of Suitable Co-Axial Cable With Bnc Connector At Both Ends, One Pair Of Suitable Co-Axial Cable With Bnc Connector At One End And Banana Plugs With Alligator Clips At The Other End. , Cro ( Digital ) Dual Channel - Digital Storage Oscilloscope, Dual Channel 100 Mhz Bandwidth 100 Mhz; 2-Channel - Sample Rate : 1Gs / S;Ultra-Thin Body - 7 Inch High Resolution Lcd , Cro ( Analog ) Dual Channel -Analog, Dual Channel 100 Mhz Bandwidth 100 Mhz; 2-Channel - Sample Rate : 1Gs / S;Ultra-Thin Body - 7 Inch High Resolution Lcd , Mechanical Stop Watch -Esal , Plastic, Dial Shape , Round, Mechanical , Digital Stop Watch - , Spectrometer Prism Holding Clamp -Spare Part Of Optical Spectrometer , Spectrometer Grating Holding Clamp -Spare Part Of Optical Spectrometer , Torch Light - 1W Bright Led Rechargeable Torch , Semiconductor Diode Laser - Max Light Power : 5Mw Operating Voltage : 3V Dcmax Operating Current : 25Malaser Wavelength : 650Nm Operating Temperature : -36 C To 65 C Working Life : More Than 1000 Hours , Bar Magnet ( For Deflection Magnetometer Experiments ) - Rectangular Bar Magnet, For Physics Lab, Size: 2 50X25 Mmthickness: 10 Mmshape: Bar ( Block ) Material: Alnicomagnet Grade: Alnico 5 , Field Along Axis Of Circular Coil Setup - Coil With 20, 30 & 50 Turns, Aluminium / Steel / Iron Body - Total 100 Turns- Provision To Place Compass Box & Magnets On Either Side Of Compass Box , Rheostat - 8 Inch ( 300 Ohm 0.8 Amp. ) , Rheostat - 8 Inch ( 30 Ohm 5 Amp. ) , Rheostat- 8 Inch ( 100 Ohm 1.6 Amp. ) , Resistance Box ( Plug Type ) - Wattage 0.5 W Resistance Range0-50Ohms, , Resistance Box ( Plug Type ) - Wattage 0.5 W Resistance Range0-10Ohms, , Resistance Box ( Plug Type ) - Wattage 0.5 W Resistance Range 0-10000 / 12000Ohms , Connecting Wires ( Single Lead ) - Dcc Copper Connecting Wire Cotton Insulated ( 100 Gm ) For Lab Use , Cro Probe Coaxial Connector Jack Type- Connector Type. Jack ; Connector Orientation. Straight ; Color. Black ; Configuration. Coaxial Connector , Electrical Alligator Clip ( Crocodile Connecting Wire ) - With Crocodile Pins At Both Ends Of -Cable Length 45Cm , Black And Red Colours , Thermocouple Full Experimental Set Up – Dpm 200Mv.Thermocouple For The Range 0 To 100 Degree C Heater1 Kw , Vernier Calipers- 10 Inch, 0.01 Cm Accuracy , Screw Guage- Micrometer With Ratchet Stop, Stainless Steel Body; Pitch 1 / 100, Size 25Mm Least Count 0.01 Mm , Capillary Tube- 100Mm Length, Both End Open , Meter Scale- Wooden, Standard Lab Size, , Tungsten Wire- ( 0.5 Mm ) Diameter, 100Gm , Npn Transistor:- Bc 107 ( ? Above 100 ) , , Npn Transistor- Sl100 ( ? Above 100 ) , Carbon Resistors : ( Quarter Watts ) - Resistance Values Needed 680O, 100O, 330O , 220O, 120O, 470O, 10O , 1.2K, 6.8K?, 5M? , 20M? , 22K?, 47K?, 470K?, 150K?, 5.6K?, 1.5K?, 2.2K?, 50K?, 10K?, 33K?, 1K?, 330K?, 4.7K?, 100K? ( 150 Each ) , Convex Mirror, - F.L.25Cm, Dia 50Mm , Pn Junction Diode- In752, , Pn Junction Diode- In4007 , Electronic Ic- Ic -741, 7473, 7400, 7490, 7402, 7404, 7408, 7432- 50 Each , Glass Slab ( English Glass ) , - 100X60x18 Mm , Determination Of Dielectric Constant Of Liquid / Thin Sheet -Complete Experimental Set Up- Capacitance Meter Input Voltage: 210~240V Ac, 50Hz Current: 200 Ma Max, Range 0-1000 Pf Resolution: 1 Pf*Dielectric Of Solids - Arrangement Capacitor: Parallel Mounted Aluminium Discs Sample Thickness: 1Mm To 25Mm*Dielectric Of Liquids - Arrangement Capacitor: Concentric Aluminium Cylinders With Cavity For Liquid Flow Suitable For Non-Corrosive Inorganic Liquids Only Sample Quantity: 75Ml , Carey Foster’S Bridge-Material Wood+Copper Color Brown Automation Type None , Single Slit Diffraction Using Laser-Experimental Setup- Diode Laser With Adaptorhe-Ne Laser Optical Bench Triangular Screen ( 30 X 30 Cm ) Set Of 13 Objects Diffraction Slides Slit Holder Metal Scale Slit ( Blade ) Measuring Tape ( 3M ) Clip 1 -10Cm Concave Lens 5Cm Concave Lens +10Cm Convex Lens +20Cm Convex Lens Prism Table Cylindrical Base Fixed Slider 3 Transversal Slider Fixed Slider ( Large Width ) , Photo Diode- Silicon Pin Photodiodes , Analog Photo Diode Characteristics Apparatus Complete Experimental Set Up- The Instrument Is Designed To Draw The Current Versus Intensity Of Lightat Different Value Of Voltage. It Has Built In Power Supply With Two Meters , Light Dependent Resistor Ldr- Diameter 5 Mmmax Voltage 150 Volts Max Power 100 Mw Light Resistance ( 10 Lux ) 5-10 Kohm Dark Resistance >100 Kohm Operating Temperature -30° To 70° C Number Of Pins 2 , Light Dependent Resistor Ldr Characteristics Apparatus, Complete Experimental Set Up- Accuracy 100%Voltage 220Vtemperature Range 50-60 Degreeapparatus Type Analog , Light Emitting Diode Leds- Red, Blue, Green, Yellow, White-50 Each , Capacitor ( Electrolytic ) - 100?F, 200?F, 0.1?F, 1?F, 10?F, 0.22?F, .47?F, .01?F, .001?F, 0.04?F, 22?F, 4.7?F , 47 ?F, 220Pf, .047?F- 20 Each , Dc Regulated Power Suppy- Input Voltage: 230V + / -10% Ac 50 Hz Output Type: Single Output Voltage: 0-30V Output Current: 10A Meter: Two Digital Meters To Monitor The Output Voltage And Current Protection: Against Short Circuit And Over Load Voltage Stability =0.2% Output Current ( 0-2A ) - ( 0-5A ) Standard Accessoriespower Cord, Manual, Test Lead Lcd Display , Dual Output Dc Regulated Power Supply- 30 V 2 A Power Supply :220 V ± 10% Ac , 50Hz ± 2H , Cro Probe- Coaxial Connector Jack Type , Digital Multimeter- Power Sourcebattery Powered Style Digital Item Dimensions Lxwxh15 X 15 X 6 Centimeters Type : Autoranging Digital Multimeter Display : 3 5 / 6 Digit Counts : 6000 Ac Voltage Range : 600Mv / 6 / 60 / 600 / 750Vtype : Autoranging Digital Multimeteraccuracy 0.5%, Type Digital, Counts 6000, Warranty1 Year Sampling Time 2-3 Times / Sec, Power Source Battery Operated, Low Battery Indication Battery Type Alkaline Display 6000 Counts Lcd Display , Slotted Weight Mass And Hanger Set -Set Of 6 Weigths 50G Each, Iron, Polished4 Slotted 50G Weights And Hanger, Total 250G Weight Box , Searles Thermal Conductivity Setup- Material Wood And Copper Rod Diameter 30 Cm X 1.8 Cm, 30 Cm X 2.5 Cm Copper Rod , Battery ( For Digital Multimeter ) - 9 V ( Pack Of 5 Batteries ) , Optical Reading Lens - Magnifying Lens With Handle, Lab Quality, Diameter - 50 Mm, Focal Length - 10 Cm, Magnification - 3.5X ( Each ) , White Screen, Wooden.-Used To Obtain Clear Image In Optics Experiments , Six Way Plug Key ( Electrical ) -Brass, Round , Copper Sulphate- 500G, Powder , Pottassium Permanganate-250G, Powder , Glass Prism -Shape: Equilateral Size: 50Mm, 60X60x60º, 50Mm ( Superior Quality ) , Quartz Prism-Calcite Quartz Prism Equilateral Size 12.5X12.5 Mm , Diffraction Grating- Optical, Glass Plate.15000 Lines Per Inch. , Brass Black Reversing Key Commutator M.I.P.Type- Thick Brass Of 10.5Mm Fitted On Heavy Bakelite Base Providedwith All Brass Terminals And Screws. , Steel Wire- 1 Mm Diameter , 100G ( For Torsion Pendulum Suspension ) , Airwedge Apparatus- Btc-Instruments Travelling Microscope, Thin Wire, Two Plane Rectangular Glass Plates A 45 Angle Inclined Glass Setup, A Reading Lens Etc Excluding Monochromatic Source ( Sodium Vapur Lamp ) ,

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Name of Work: SUPPLY OF PHYSICSLAB EQUIPMENTS

Sl. No.	Item Description
1	LAB EQUIPMENTS FOR PHYSICS LAB
2	Mercury vapour lamp bulb- 125WBC Nom LUMENS 6000 250V (For optical spectrometer experiments) bulb only
3	Sodium low pressure vapour lamp bulb- 35W (For optical experiments spectrometer experiments) bulb only
4	Hare"s apparatus:- Three-limbed glass tube, with 250mm of rubber tubing on the centre limb, mounted on a stand with a scale 61cm long with the zero at the bottom.
5	Glass burette- Borosil 50mL Straight Bore Burettes with Stopcock,
6	Compass box for deflection magnetometer:- Consisting of a circular bakelite box with aluminium dial of about 100mm diameter, having circular scale graduated 90º-0-90º-0- 90º, divided in four quadrants. Magnetic needle is mounted on hardened steel pivot for smooth movement. With anti- parallax mirror slot
7	Step down Transformer (With centre tap)- 6-0-6 (230 to 6V) Input Voltage:230VAC Output Voltage: 6V, 6V or 0V Output Current: 3 Amp Mounting: Vertical mount typeprovision for connecting to secondary coils and centre tap to circuit
8	Newton"s ring complete experimental set up- Includes travelling microscope, inclined glass plate setup focusing lens, excluding Sodium vapour lamp setup
9	Scale and telescope arrangement- The telescope should be mounted on a specially designed carriage with support ring to stop abrupt falling. The carriage should be fitted with two adjustable screws for precise vertical and horizontal positioning. The whole arrangement mounted on a long steel pillar, fitted on a cast iron base with leveling screws. A scale holder with scale should also be fitted vertically on the steel pillar.(for static torsion experiments)
10	Ammeter Range 0-1A - DC analogammeter 0-3A amperes for lab desk stand type moving coil for use in scientific laboratory education purpose
11	Ammeter Range 0-500mA- DC analogammeter 0-500mA amperes for lab desk stand type moving coil for use in scientific laboratory education purpose
12	Galvanometer- Dc Galvanometer analog for lab 30-0-30V portable,for detecting and indicating an electric current in experiments related to science
13	Kater’s pendulum full apparatus set- black and silver
14	Jockey (sliding)- for potentiometer experiments, steel or iron make, high quality
15	Plano convex lens-for Newtons rings experiment ( f=100cm)
16	Convex lens- (EXACT FOCAL LENGTH) DIA 2" FL 25cm, Convex Lens (Exact)
17	optical Spectrometer -6/7” least count 30’
18	Melde"s string- full Experimental set up -with electrically vibrating strip tied to a thead with bulb, clamp, pan and weights .Electrically maintained tuning fork,*Melde’s coil, *Thread, *Scale pan Pulley on stand,
19	Mirror strip - (used for scale and telescope static torsion & Optic lever experiments)
20	E/M BY Thomson Method full setup - a. High voltage Power Supply with One digital meter provided to measure the deflection voltage. Complete with separate intensity, focus and deflection controls.b. CRT- 3BP1 mounted on teak wood frame c. Graduated teak wood platform to place magnets at the height of deflection plates. d. Two small magnets e. Deflection magnetometer compass box.Complete in all respects with working manual.
21	Function generator: (for CRO experiments) - Sine, Square, Triangular and Pulse wave forms Frequency range: 1 Hz to 5 MHz (3% accuracy) Output voltage: 10 mV to 20 V Output socket- BNC Input power: 220 - 240 V, 50/60 Hz Accessories required: Power cord for input power, One pair of suitable co-axial cable with BNC connector at both ends, One pair of suitable co-axial cable with BNC connector at one end and banana plugs with alligator clips at the other end.
22	CRO (Digital) Dual channel - Digital Storage Oscilloscope, Dual Channel 100 Mhz Bandwidth 100 MHz; 2-Channel - Sample rate : 1GS/s;Ultra-thin body - 7 inch high resolution LCD
23	CRO (Analog) Dual channel -Analog,Dual Channel 100 Mhz Bandwidth 100 MHz; 2-Channel - Sample rate : 1GS/s;Ultra-thin body - 7 inch high resolution LCD
24	Mechanical Stop watch -Esal ,Plastic,Dial Shape ,Round,Mechanical
25	Digital stop watch -
26	spectrometer Prism holding Clamp -Spare part of optical Spectrometer
27	spectrometer Grating holding Clamp -Spare part of optical Spectrometer
28	Torch light - 1W Bright Led Rechargeable Torch
29	Semiconductor diode laser - Max Light Power : 5mW Operating Voltage : 3V DCMax Operating Current : 25mALaser Wavelength : 650nm Operating Temperature : -36 C to 65 C Working Life : More than 1000 hours
30	Bar Magnet (for deflection magnetometer experiments) - Rectangular Bar Magnet, For Physics Lab, Size: 2" 50x25 mmThickness: 10 mmShape: Bar (Block) Material: AlnicoMagnet Grade: Alnico 5
31	Field Along Axis of Circular Coil setup - Coil with 20, 30 & 50 Turns, aluminium/steel/iron body - Total 100 turns- Provision to Place Compass Box & Magnets on Either Side Of Compass Box
32	Rheostat - 8 inch (300 ohm 0.8 Amp.)
33	Rheostat - 8 inch (30 ohm 5 Amp.)
34	Rheostat- 8 inch (100 ohm 1.6 Amp.)
35	Resistance box (Plug type)- Wattage 0.5 W Resistance Range0-50ohms,
36	Resistance box (Plug type)- Wattage 0.5 W Resistance Range0-10ohms,
37	Resistance box (Plug type)- Wattage 0.5 W Resistance Range 0-10000/12000ohms
38	Connecting wires (single lead)- DCC Copper Connecting Wire Cotton Insulated (100 gm) for Lab use
39	CRO Probe Coaxial connector jack type- Connector Type. Jack ; Connector Orientation. Straight ; Color. Black ; Configuration. Coaxial connector
40	Electrical Alligator Clip (Crocodile connecting wire)- with crocodile pins at both ends of -Cable Length 45cm , black and red colours
41	Thermocouple full experimental set up – DPM 200mv.Thermocouple for the range 0 to 100 degree C heater1 Kw
42	Vernier Calipers- 10 inch, 0.01 cm accuracy
43	Screw guage- Micrometer with ratchet stop, Stainless Steel body; Pitch 1/100, Size 25mm Least count 0.01 mm
44	Capillary tube- 100mm length, both end open
45	Meter Scale- wooden, standard lab size,
46	Tungsten wire- (0.5 mm) diameter,100gm
47	NPN Transistor:- BC 107 ( ß above 100) ,
48	NPN Transistor- SL100 ( ß above 100)
49	Carbon Resistors : (Quarter watts)- Resistance values needed 680O, 100O, 330O , 220O, 120O, 470O, 10O ,1.2K, 6.8KO,5MO ,20MO ,22KO, 47KO, 470KO, 150KO, 5.6KO, 1.5KO, 2.2KO, 50KO, 10KO, 33KO, 1KO, 330KO, 4.7KO, 100KO (150 each)
50	CONVEX MIRROR,- F.L.25cm, Dia 50mm
51	PN JUNCTION Diode- IN752,
52	PN JUNCTION Diode- IN4007
53	Electronic IC- IC -741, 7473,7400,7490,7402,7404,7408,7432- 50 Each
54	GLASS SLAB (English Glass), - 100x60x18 mm
55	Determination of dielectric constant of liquid/thin sheet -complete experimental set up- Capacitance Meter Input Voltage: 210~240V AC, 50Hz Current: 200 mA Max, Range 0-1000 pF Resolution: 1 pF*Dielectric of Solids - arrangement Capacitor: Parallel mounted aluminium discs Sample Thickness: 1mm to 25mm*Dielectric of Liquids - arrangement Capacitor: Concentric aluminium cylinders with cavity for liquid flow Suitable for non-corrosive inorganic liquids only Sample quantity: 75ml
56	Carey Foster’s bridge-Material wood+Copper Color Brown Automation Type None
57	Single slit diffraction using LASER-Experimental setup- Diode laser with adaptorHe-Ne laser Optical bench triangular Screen (30 x 30 cm) Set of 13 objects Diffraction slides Slit holder Metal scale Slit (Blade) Measuring tape (3m) Clip 1 -10cm concave lens 5cm concave lens +10cm convex lens +20cm convex lens Prism table Cylindrical base Fixed slider 3 Transversal slider Fixed slider (large width)
58	Photo Diode- silicon PIN photodiodes
59	Analog Photo Diode Characteristics Apparatus complete experimental set up- The instrument is designed to draw the current versus intensity of lightat different value of voltage. It has built in power supply with two meters
60	Light dependent resistor LDR- Diameter 5 mmMax Voltage 150 volts Max Power 100 mW Light resistance(10 lux) 5-10 kohm Dark Resistance >100 kohm Operating Temperature -30° to 70° C Number of Pins 2
61	Light dependent resistor LDR Characteristics Apparatus,complete experimental set up- Accuracy 100%Voltage 220VTemperature Range 50-60 DegreeApparatus Type Analog
62	Light emitting diode LEDs- Red,Blue, Green, Yellow, White-50 Each
63	Capacitor (electrolytic)- 100µF, 200µF, 0.1µF, 1µF,10µF, 0.22µF, .47µF, .01µF, .001µF,0.04µF, 22µF, 4.7µF ,47 µF,220pF, .047µF- 20 Each
64	DC regulated Power Suppy- Input Voltage: 230V +/-10% AC 50 Hz Output Type: Single Output Voltage: 0-30V Output Current: 10A Meter: Two digital meters to monitor the output voltage and current Protection: Against short circuit and over load Voltage Stability =0.2% Output Current(0-2A)-(0-5A)Standard AccessoriesPower cord, Manual, Test Lead LCD Display
65	Dual Output DC Regulated Power Supply- 30 V 2 A Power Supply :220 V ± 10% AC , 50Hz ± 2H
66	CRO Probe- Coaxial connector jack type
67	Digital Multimeter- Power SourceBattery Powered Style Digital Item Dimensions LxWxH15 x 15 x 6 Centimeters Type : Autoranging Digital Multimeter Display : 3 5/6 Digit Counts : 6000 Ac Voltage Range : 600mv/6/60/600/750vType : Autoranging Digital MultimeterAccuracy 0.5%,Type Digital,Counts 6000,Warranty1 Year Sampling Time 2-3 times/sec,power source Battery Operated, Low battery Indication Battery Type Alkaline Display 6000 Counts LCD Display
68	Slotted weight Mass and Hanger Set -set of 6 weigths 50g each, iron, polished4 Slotted 50g Weights and Hanger, Total 250g Weight Box
69	Searle"s Thermal Conductivity setup- Material Wood and Copper Rod Diameter 30 cm x 1.8 cm, 30 cm x 2.5 cm copper rod
70	Battery (For digital Multimeter)- 9 V (Pack of 5 batteries)
71	Optical reading lens - Magnifying Lens with Handle, Lab Quality, Diameter - 50 mm, Focal Length - 10 cm, Magnification - 3.5X (Each)
72	WHITE SCREEN, Wooden.-used to obtain clear image in optics experiments
73	Six way plug key (Electrical)-BRASS, Round
74	copper sulphate- 500g, powder
75	Pottassium permanganate-250g, powder
76	Glass prism -Shape: Equilateral Size: 50mm,60x60x60º, 50mm (Superior Quality)
77	Quartz prism-Calcite Quartz Prism Equilateral Size 12.5X12.5 mm
78	Diffraction grating- optical,Glass Plate.15000 lines per inch.
79	Brass Black Reversing Key Commutator M.I.P.Type- Thick brass of 10.5mm fitted on heavy bakelite base providedwith all brass terminals and screws.
80	steel wire- 1 mm diameter , 100g (for torsion pendulum suspension)
81	Airwedge apparatus- BTC-Instruments travelling microscope, thin wire, two plane rectangular glass plates a 45" angle inclined glass setup, a reading lens etc excluding Monochromatic source (sodium vapur lamp),