Teltron Dual Beam Tube S

Product Code : SLE/PHY/53

Semi-evacuated electron tube filled with low-pressure helium and containing a tangential and axial electron gun. In the case of axial bombardment and a co-axial magnetic field, kinetic gas theory (e.g. impact excitation) and particle collisions can be studied through observations of the fine, luminescent beams resulting from excitation of the helium atoms. In the case of tangential bombardment and a perpendicularly aligned magnetic field, the fundamental electron charge-to-mass ratio can be determined from the diameter of the observed beam pattern. Instructions included

Specification :
Max. filament voltage
: 7.5 V
Max. anode voltage : 300 V DC
Anode current : approx. 30 mA at 200 V (anode)
Max. deflection voltage : 50 V DC.

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Monocular Microscope 1000x, LED light

Product Code : SLE/M/04

The microscope has been designed for education and is used for routine work in the laboratory at all levels of knowledge and understanding. 
Brightfield observation technique. 
Made of die-cast metal and  anti-funghus glass optics.

Technical Specification:-
Head: Monocular inclined 30º and 360º rotatable.
Eyepiece: Widefield WF10x/18mm.
Objectives: DIN Achromatic 4x/10x/40x/100x (Oil)
Condenser: Abbe 1.2 N.A. precentered and diaphragm.
Focusing system: Coaxial coarse and fine focusing mechanism (graduation 0.002mm) with limit stop. Adjustable tension of coarse focusing knob.
Stage:  Size 125x116mm with double layer mechanical stage X-Y movement range 76x30mm.Vernier scale on the two axes, accuracy 0.1mm. Specimen holder for one slide.
Illuminator: 1W LED with external power supply. Light intensity controlled by a knob on the left side of the base. LED average lifetime 50.000hours.

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Teltron Electron Diffraction Tube S

Product Code : SLE/PHY/54

Highly evacuated electron tube for demonstrating the wave nature of electrons through the observation of interference caused by passage of electrons through a poly crystalline graphite lattice (Debye-Scherrer diffraction) and rendered visible on a fluorescent screen. Also intended for determining the wavelength as a function of the anode voltage from the radii of the diffraction rings and the lattice plane spacing of graphite, as well as confirming de Broglie’s hypothesis. Instructions included

Specification :
Max. filament voltage
: 6.3 V AC
Lattice constant of graphite : d10 = 0.213 nm; d11 = 0.123 nm.
Max. anode voltage : 5 kV
Anode current : approx. 0.1 mA at 4 kV


Teltron Tube Holder D

Product Code : SLE/PHY/55

Holder for the complete range of Teltron D-series tubes and accessories. Three rubber feet prevent slipping and provide maximum stability. Cast light alloy stand has a wishbone, 360° rotating clamp made of heat-resistant plastic and two base holes for affixing the Teltron D Helmholtz Coils. 4 mm earthing socket in pillar base. Instructions included.

Dimensions : approx. 230 x 175 x 320 mm
Weight : approx. 1.5 kg

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Teltron Helmholtz Pair of Coils D

Product Code : SLE/PHY/56

Pair of Helmholtz coils for generating a uniform magnetic field perpendicular to the axis of the Teltron D series tubes. The maximum field strength  enerated by the coils (~ 10 mT) is approximately 300 times weaker than that produced by an MRI machine (~ 3T),  which are known to be safe for use by people with medical implants such as pacemakers. Allows the coils to be configured in the Helmholtz geometry or to produce magnetic fields aligned vertically, or coaxial, with respect to the tube axis.
Instructions included.

Specification : 
Number of turns :
Max. continuous current : 1.0 A
Max. momentary current : 10 min @ 1.5 A; 3 min @ 2 A
Connectors : 4-mm sockets.
Effective impedance : 6 ohm
Max. field strength : approx. 10 mT

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Binocular Microscope, 1000x Mag LED

Product Code : SLE/M/05

This 1000x magnification microscope from is a premium high specification unit for A Level and Higher education applications. 
The microscope comes with four achromatic objectives.

Head: Binocular, 30°inclined, 360°rotating.
Eyepiece: WF10x/18mm
Focusing system: Coaxial coarse and fine.
Stage:Double layer, 125 x 115mm with x-y 70x30mm moving range.
Objectives: Achrom. DIN 4x, 10x, 40x, 100X (Oil).
Magnifications:40x, 100x, 400x, 1000x.
Condenser:1.25 N.A. Abbe.
Illumination:LED with adjustable intensity.

Technical Specifications:-
Illumination Light source type: X-LED with white LED; light intensity control using a knob on left side of the frame. LED power 3W, comparable to an halogen bulb 30-35W. 
Colour temperature: 6300K LED average life time approx. 50.000h.
Voltage: external power supply 100/240Vac, 50/60Hz, output: 7,5 VMax power required: 7W
Observation Modes: Brightfield slide. Vernier scale on the two axes, accuracy 0,1 mm.
Nosepiece: Quadruple revolving nosepiece, rotation on ball bearings.
Head: Binocular observation head, inclined 30° and rotatable 360°. Diopter adjustment on left eyepieces. Interpupillary adjustment 48-75 mm.
Focusing: Coaxial coarse and fine focusing mechanism (graduated, 0.002mm) with upper stop, to prevent the contact between objective and specimen. Adjustable tension of coarse focusing knob.
Stage: Double layer with mechanical sliding stage, size 125x115mm, X-Y movement range 76x30, specimen holder for one 
Eyepieces Wide field eyepieces WF10X/18 with field number 18.
Objectives: Achromatic objectives with mechanical tube lenght 160 mm, made by following objectives:
-) Achromatic DIN 4X, A.N. 0.10, W.D. 18 mm
-) Achromatic DIN 10X, A.N. 0.25, W.D. 7 mm
-) Achromatic DIN 40X, A.N. 0.65, W.D. 0,53 mm
-) Achromatic DIN 100X, A.N. 1,25, W.D. 0,13 mm (oil immersion)

All objectives are treated with an anti-fungus treatment.
Condenser: Abbe condenser, N.A. 1,25 precentered
Dimensions: HEIGHT: 370 mm
                      WIDTH: 235 mm
                      DEPTH: 290 mm
                      WEIGHT: 6,5 kg
Accessories Instruction manual and dust cover included

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Cylinders, Metal (Set of 6)

Product Code : SLE/PHY/57

Metal Cylinders
Precision cylinders for experiments on density.
Set of 6.
Diameter : 10 mm
Supplied in wooden block.
Cylinders : Brass, Lead, Iron, Copper, Aluminium and Zinc.

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Metal Density Cubes (Set of 6)

Product Code : SLE/PHY/58

Set of 6
Side : 20 mm
Brass, Lead, Zinc, Copper, Aluminium & Iron.

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