J.J.Exports Chittaranjan Park, Delhi

For demonstrating longitudinal and transverse motion, consisting of 18 acentric Aluminium disc supporting a series of metal rods. On revolving the handle, transverse waves are obtained with bent, straight rods. Complete on wooden box.

Operates on 12 V a.c. The timer employs electromagnet, with spring loaded armature which vibrates above a support table for a carbon paper disc. Paper tape, drawn through guides on the table, is struck by a dotting screw carried on the armature. Additional with extra guides accommodate 4.5mm external diameter rubber tubing for the 'Pearls in air' water drop experiment. The peg on the support table is movable to allow maximum use of carbon paper discs. supplied with 300m roll of tape and carbon paper discs. The ticker tape timer produces dots spaced at 150 or 160s intervals depending on main frequency.

For determining the relative conductivity of bad conductor material consists of cylindrical slab of brass 11.5cms. In dia and 12mm thick drilled to take thermometer. On this rests a 5cms deep steam chest of the same dia, with inlet and outlet tubes of steam. The apparatus is suspended by strings attached to the lower cylinder with thermometer. On retort stand with rectangular base 200 x 125mm, and rod 600mm long. Complete with one each disc specimens, glass and plastic 3mm and 1.5mm thick respectively, for determining the conductivity of liquids.

For use in northern and southern Hemisphere. Glass sphere clamped concentrically in section of accurately turned spherical metal bowl of diameter equal to focal length of glass sphere, bowl with three overlapping pairs of grooves each to accommodate shaped cards. Fitted on heavy marble base.

Insect proof, sturdy, slide box provides the ultimate protection to the Microscope slides. This is moulded in high impact polythene. The base has numbered grooves for placing 25x75mm slides and the top portion has an index card for quick identification.

To measure transpiration, without breakage. Only one glass component (the capillary tube) and is mounted on a wrong backing plate. It consists of a capillary tube with millimeter scale connected via a three way tap to a syringe. The cut shoot is connected to the third outlet.It can also be used to measure humidity by connecting a porous pot to the third outlet.Dimensions overall 155x165x60mm, width x height x length.

Consisting of a pair of plano convex lenses mounted in a bakelite body in such a way that the distortion at the edge of the field is reduced to minimum. Lens mount folds into case.Clear diameter of the lenses 19mm approx. Magnification X10.

50 mm diameter with ground and polished faces and ground edges. Comprises one each of the following:- Double convex, Plano-Convex. Converging concave-convex, Diverging concave-convex, double concave, Plano-concave. Supplied in a velvet lined box.

Biological instruments set consisting of 20 instruments for accurate dissection. The instruments are housed in a highly polished velvet lined wooden box. Details : Scissors 2 Nos., Forceps 2 Nos., Needles 4 Nos., Scalpel 1 No., B.P. Handle with blade 1 No., Razor 1 No., Watch Glass 1No., Magnifying glass 1 No., Glass slide 1 No., Chain and Hook 1 No., Cover slip 1 No., Blow pipe 1 No., Needle plastic handle 1 No., Dropper glass 1 No. and Brush 1 No.

Biological Instruments set consisting of 7 Instruments housed in a velvet lined plastic box. Details :Scissors 2 Nos., Forceps 2 Nos., Needle pointed 1 No., B.P. Handle with blade 1 No. and Needle plastic handle 1 No. NOTE :The above Biological Instruments Sets can also be supplied in a canvas roller case.

High density polythene body ; capacity upto 10 standard 25 to 75mm slides, back to back. Grooved to hold slides in erect position with domed and shallow thread screw cap.