ELECTRICAL TUNNING FORK

(see P-789) P-722 INSIF
Also known as Melds Apparatus.
* It consists of a coil : wound of copper wire of 22/24 SWG on metal rod with non conductive handle with two brass terminals to be connected to transformer 6VDC fitted on Bakelite base, * input 220VAC.

DISCHARGE TUBE

P-744 INSIF
Types:
i) Hydrogen ( H2),
ii) O2 (Oxygen),
iii) N2 (Nitrogen),
iv) Hg Mercury),
v) Neutral Gases
vi) Helium (He)
A) Discharge Tube

INDUCTION COIL 15MM

P-753 INSIF
* The coil :is wound with insulated copper wire, has Brass contacts and on/off reversing switch as communicator. Voltage tested condensers are fitted inside teak polish wooden box.
* The top of the wooden box: is provided with two long metal pins fitted with brass screws with a provision of adjustment its distance, where spark occurs.
* Terminals are provided for H.T output & L.T. Input of the coil.
* Up to 50 mm spark is obtained with 4-6 volt D.C. Input .

INDUCTION COIL 100MM

P- 754A

Anchor Ring P-754B INSIF
* it consists of a specimen of iron in a ring form wound with two uniformly spaced coils of wires. Soft iron ring is of dia 75 mm and cross sectional dia is 9mm.
* The primary winding consists of 200 turns of insulated copper wire of proper gauge with binding post terminals and secondary winding consists of about 25 turns of fine wire.

MELDIES APPARATUS

INSIF P-789
* Consists of a grooved vertical adjustable support.
* It has a frequency of approximately 60 vibrations per sec.
An electromagnet :is arranged between the prongs of the fork without touching it.
* A small spring type strip just is attached to the one of the prongs. A screw just makes contact with this strip.
*
Complete with: scale, pan, bench, clamp with pulley & thread but without weights
* mounted on a heavy cast Iron base.

MILLIKANS OIL DROP APPARATUS

INSIF P-797
Invention: Prof. Robert A. Millikan measured the change on the electron.
A light source: (6 Volt DC) fitted with condenser,and a measuring microscope called All are mounted on a common support. telescope.
Base: A heavy cast iron base Which is mounted on a steel pillar that carries the above
* The microscope:Can be adjusted smoothly slow motion screws in the horizontal as well as in the vertical direction.
*Atomizer: Is also fitted on the same carriage.
* Power Supply: A high voltage supply 300V DC with reversing Voltage switch

RIPPLE TANK

INSIF P-885
OBJECT: STUDY OF WAVE FORM , PRODUCED THROUGH THE RIPPLES
* Made of metallic frame with clear glass inside mounted with sealing compound.
* An electric motor (DC 1.5 Volt) having two legs for operating as ripple producer.
* A) Obstacles to show various ripples 12” x 12”
* B) -do- 18” x 18”

Discharge tube holder

B) Special Box With Holder And Pins for one tube
* having two holders for discharge tube.
* these holders are designed to fit specific size of tubes
* Types:
1) made of New Laminated wood , with two bakelite holders & one PVC stand
2) made of wood Box type with two copper clips at both sides & two terminals at both ends
3) set of SIX tubes: having holders for six tubes & a Rotary switch for selecting any tube holder for current.

High Voltage Transformer For Discharge tubes

C) P-744 INSIF
* Fitted in Metal box with two heavy terminals
* operatable on 220 V AC 50Hz mains.
* one LED is provided
* TYPES:
1) To give proper glow for 6 to 8" discharge tube
2) To give Bright glow for 12" discharge tube