Rapid Education - Science

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13
13
Order code
52-3569
£11.45
Laboratory Equipment
Potometer
A potometer is an apparatus used
to measure the rate of water loss,
ortranspiration , from a plant. The
rate of transpiration is determined by
measuring the drop in water level in a
graduated tube over a period of time.
The drop in water level is caused by
the plant absorbing water to replace
an equal volume of water lost by
transpiration.
The apparatus is mounted on a
strong backing plate and consists of a
capillary tube with a millimetre scale,
connected via a three-way tap to a
syringe. A cut shoot is connected to
third outlet.
• Ideal for laboratory and field use
- only one glass component, the
capillary tube
• Overall dimensions 195 x 150x
75mm
• Capillary tube 100x 1mm
• Supplied with instruction manual
• Eisco type BI0192
Ganongs Potometer
A potometer is an apparatus used to measure the rate of water loss, or
transpiration, from a plant. In the Ganong’s potometer, the rate of transpiration
is determined by measuring the position of an air bubble in a graduated tube over
a period of time. The change in position is caused by the plant absorbing water
to replace an equal volume of water lost by transpiration.
A plant shoot is sealed into a stopper which fits the end tube and the whole
apparatus is filled with water, the open end of the capillary tube, which is
graduated in millimetres, dipping into a beaker of water. The position of the air
bubble may easily be adjusted by opening the glass
stopcock to admit water from the reservoir.
The apparatus is mounted on a wooden base with
the tubes held by clips.
• Height to top of reservoir 170mm
• Diameter of reservoir 20mm
• Length, overall 320mm
• Base 80 x 20mm
• Capillary bore 1 mm
• Eisco type BI0193A
Polypropylene Carboys
These carboys are made from polypropylene and
are much lighter than glass. They are autoclavable,
durable and have wide handles for easy carrying
and pouring.
• Available in 10 and 20 litre capacities
• Eisco CH0065 series
Capacity Order code 1+
10 litres 52-3526 £26.95
20 litres 52-3527 £33.95
565628
Watch Glasses - Packs of 12
Watch glasses are highly functional items of glassware that have a variety of uses in the classroom or
laboratory. They work well as lids for flasks and beakers, or for holding small samples for observation under
a low-power microscope. They are also ideal for evaporating liquids from samples, such as when
growing seed crystals, and can be used for making lenses from ice or other liquids.
Eisco watch glasses are manufactured with sturdiness in mind. Their 2mm thick construction
resists shattering and as they have ground edges, as well as a polished surface, so you can be
sure that they are a safe product to handle in the classroom or the laboratory.
• Available in a range of diameters
• Eisco CH0554 series
Diameter Order code 1+
50mm 52-3467 £1.69
60mm 52-3559 £1.99
75mm 52-3468 £3.29
90mm 52-3469 £3.85
100mm 52-3470 £4.19
125mm 52-3560 £7.29
150mm 52-3561 £8.99
565603
Order code
52-3493
£19.95
Order code
52-3492
£14.95
Porcelain Mortars
& Pestles
A range of porcelain mortars and pestles
with unglazed grinding surfaces.
• Supplied as a set containing one mortar
and one pestle
Mortar capacity Order code 1+
60ml 52-3571 £1.19
275ml 52-3572 £2.52
550ml 52-3573 £3.95
900ml 52-3574 £4.29
1500ml 52-3575 £7.39
2000ml 52-3576 £9.99
565633
Glass Tubing Cutter
This rugged laboratory glass tube cutter is made
from nickel-plated, die-cast metal.
It is fitted with a spring-loaded steel wheel and
can cut glass tubes up to 40mm in diameter.
• Nickel-plated, die-cast metal
• Spring-loaded steel wheel
• Cuts glass tubes up to 40mm dia.
• Eisco type CH0759SUP