Made from extra white and moulded glass size
a) 38mm height
b) 50mm height

Made from white and moulded glass 90x45x45 size
a) 38mm height
b) 50mm height

Aluminum pulley 38 mm diameters in metal bracket with fixing holes

Made of aluminum accuracy centered, 50mm diameter.
1) Single pulley with hook
2) Single Pulley with 2 Hook
3) Double parallel pulley with 2 hooks
4) Double long pulley with 2 hooks
5) Triple parallel pulley with 2 hooks
6) Triple long pulley with 2 hooks

All glass, colored visible valves, UN mounted.

One set of vanes that rotate when placed sun light showing the mechanical effect of reflection and absorption of heat and light on the vanes surface. Complete with stand

Made of brass or copper durable, it has a 130mm funnel, an inner receiving vessel ad outer body all of brass or copper and a glass/ plastic measuring cylinder, graduated 0 to 10m in to 0.1mm .

A sheet Metal Lamp housing 155x70x55mm has an open front with extended sides finned extremely for heat dissipation and vertical internal slots to accommodate a slit plate and a cylinder cal lens. With metal plate single and triple slits and whitened on one side for use a returned image screen 12-volt lamp and a lamp holder. The triple slit used along with cylindrical biconvex lens (focal Length 75mm) produces divergent, parallel or convergent rays.

Ray track apparatus consist of a wooden board 40x28x1.2cm with white matt surface, carrying a circular scale divided in to four quadrants each 0-90o graduated are very 2o a removable turntable 17cm diameter with two lines at right angles and a ray box No JSS 260. Slots in the ray box can accommodate metal slits, colours filters, lenses etc. The ray box is fitted with a 12 volts lamp. Supplied complete with on cylindrical biconvex lens; focal Length 75mm and two double and triple slits, one side being whitened for use as a return image screen

Interchangeable plugs and nicely fitted in wooden/ metal box and terminals for connections with infinity circuit.
Available in the following Ranges:
a) Constantan wire, coils accuracy +/- 0.1%
b) Margining wire coils accuracy +/- 0.05%

Resistance coil with non –inductivity wound coil in a black bakelite core with 2,4mm terminals, availability in different values

Resistance coil with non –inductivity wound coil in a black bakelite core with 2,4mm terminals, availability in different values

These resistance in corporate the latest improvement s and carry comparatively large current without injury. Resistances below 0.1 ohms are constructed of maganin sheet and higher resistance of double natural silk covered maganin wire. All resistance is aged for fairly long periods. Connection is silver soldered.

Accuracy: _
Up to 0.1 ohms 0.05%
1 Ohms and above 0.05%
Resistance in ohms 0.001, 0.01,0.1,1,10,100,1000

A Pair of nickel –plated tuning fork, on individual resonance box to demonstrate beats. Complete with hammer.

Made of M.S Sheet die pressed holds objects from 15mm to 65mm with cork-lined jaws, provides secure contact with side brass wing –nut adjustable. Sheet rod 145x7.5mm (length X diameter) all parts chrome plated without boss head.

For holding burettes and other objects of up to 60 mm. Pressure dies cast, out of a light alloy. Cork lined jaws provided secure contact, with chrome plated brass Tommy bar adjusting screw and Aluminum anodized stem 150x 8mm, length diameter. With out boss head.

Die cast, strong for holding objects 100mm, cork lined jaws. Provide secure contact, with planted brass Tommy bar adjusting screw and Aluminum anodized stem 150x8mm, length diameter without boss head.

Sheet Iron, rectangular base with powder coated paint with hole 12.5mm dia meter, M.S sheet rod chrome plated round and other end machine threaded washer and hexagonal nut.

Made of Aluminum alloy Two V groves in the body are accurate ad give affirm grip to retort stand, the chrome Plated thumbscrews fitted in the boss head.

Iron, with straight stems 140mm long, for fitting in to boss heads. Diameter in mm, 50mm 63mm 75mm and 100mm

Rheostats are wound with heavily oxidized iron free nickel copper wire on vitreous enameled round steel tube. Contacts are of laminated phosphor bronze sheet. Resistance tolerances are +2% /-2% of the specified value. The marked current capacity is based on the tube being mounted vertically in free air with contacts operating at lower end of the hot portion of the winding or in case the current is passed intermittently. Should it be necessary to mount the tube horizontally or pass current for a long duration, the current should not exceed 75% of the marked value.

All apparatus for demonstrating thermal expansion comprising a captive brass ball secured to mount brass ring by Ball. The ring when cold but can not pass through after being heated.

With wooden pulley of 12 cm diameter, fitted on wooden base, adjustable metal pulley and scale pan

Standard pattern 162 mm, radius, scale in laid strip of nickel silver –accurately divided to 120 o of are and reading by micrometer head to 12 seconds. Telescope inverting collimating achromatic objective 150mm focus remsdan eye piece 8 x glasses cross line graticule full set of seven high grade optical filters Complete with sight tube, one sub glass and one inverting telescope in wooden case with lock and key.