A modified thermal convection drying technique for herbarium preservation

A simple and efficient installation for drying plants that is both rapid and preserves colour, and which works on the principle of autonomous thermal convection, is presented. The described apparatus offers significant advantages including: uniform heat distribution and short drying times; a system for applying pressure to prevent shrinkage, which uses polyurethane foam sheets and elastic straps; a compact, space-saving system suitable for field or laboratory applications; absorbent materials which can be re-used immediately; ability to run off differing power supplies (110/220 V) and to use infra-red lamps of varying specifications; low cost and ease of use.