This air operated spraying apparatus applies an even deposit
of spray over a circular area of 9cm diameter. Suitable for studying
the biological effects of chemicals both when applied as direct
spray on organisms or as a residual film. The towers incorporate
developments from Rothamsted Experimental Station.
The automatic safety load-unload system allows operators to
place petri dishes on the spray table away from the spray tube
and therefore avoids the risk of contamination with hazardous
materials. This design offers a smoother elevation of the table
and prevents the air from passing to the atomiser until the table
is finally positioned. The automatic operating cycle enables
increases in processing speeds.
The Potter Tower is internationally recognised as the standard
of reference for chemical spraying techniques in the laboratory.
This type of apparatus is required for studying the biological
effects of contact poisons on organisms.
Two models are manufactured by Burkard Scientific at Uxbridge
- the standard version and more recently, a model with a safety
automatic load/unload facility. Each instrument has similar spray
performance characteristics and is designed to apply precise
and uniform deposits of spray over a circular area of 9cm (3.54")
The Tower incorporates developments from the Rothamsted Experimental
Station (AFRC - Harpenden, Herts, England) and includes quickly
detachable atomizers and a pneumatically operated spray table,
with all controls mounted conveniently at the front.
A 0-2.5 BAR 10cm/4in.dia. 0-30 lb/sq in, pressure gauge is fitted
as standard. A laboratory scale compressor unit and a manometer
are also offered as optional equipment.
Throughout industry and research there are increased tighter
controls on the handling and use of pesticides both in the field
and the laboratory. Mindful of this trend and the potential for
operator exposure and contamination in Potter Tower tests for
pesticides. Burkard Scientific have introduced an auto-load system.
The load-unload pneumatic option for the Potter Tower eliminates
the need for operators to manually place petri dishes on the
spray table immediately beneath the spray tube and therefore
avoids the risk of contamination. With an automatic operating
cycle and the pneumatic on/off switch mounted outside of the
fume cupboard loading and unloading of petri dishes can now be
made well clear of harmful pesticides. This design offers a smoother
elevation of the table and prevents the air from passing to the
atomizer until the table is finally positioned. The tower is
manufactured from an attractively finished high grade of stainless
Ref: The Annual of Applied Biology Vol. 39 No. 1 March
1952. "Laboratory apparatus for applying direct sprays
and residual films"