J.J.Exports Delhi

• CODE1653

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.

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.

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.

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.

• CODE281

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.

• CODE1705

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.