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4. it is hoped that this type of report will, in time, encourage direct exchange between various persons actually in these activities in different parts of the world, in order td facilitate this interchange, French and Spanish language versions of this report are also being prepared.

Finally it is essential that persons wishing to utilize solar drying techniques have readily available information in a condensed fashion, which can help render their own work more complete. It is desirable that as much research and development, and local adaptation, as possible be undertaken in the areas where the equipment is to be used in order to develop really ppropriate Technological systems.

This survey of solar dryers is part of a larger Handbook on solar agricultural dryers and will be eventually incorporated into this manual. The'data presented herein for a large part resulted from answers to a questionnaire circulated by this Institute and reprinted on the following pages. The response was encouraging. Every attempt has been made to reproduce in an unchanged fashion, the information, remarks and comments of the principal investigators as indicated in their replies. We indeed are grateful to the contributors who have kindly agreed to share information on their activities in this field with others.

The data is presented as case studies, in a reasonably standardized format. Units have been listed throughout according to the Système International Postal addresses of the various individuals or organizations working in the field have also been given for ease of communication. For further information, enquiries might best be addressed to the respective organizations rather than specifically to individuals.

These case studies deal with descriptions of the dryers, experimental results, photos, drawings and the like. Theoretical evaluations and other matters relating to the field of solar drying will be dealt with separately in the Handbook. It is appreciated that the latter will be more complete in the totality of its presentation; these case studies are made available at this time primarily for descriptive purposes.

The information on the solar dryers has been prepared from replies to the questionnaires as well as the review of specific data available on this subject.

The titles of the case studies have been tabulated on the following page and are divided into five sections. Each section applies to a different heat mode characterizing the classification of solar dryers. The principal section titles are defined following the tabulation, it must be realized that there i® necessarily some overlapping from one section to another The case studies are presented starting from the natural or sun drying experiences leading on to a variety of helio technological developments in this field.

In "the interest of standardization, all data dealing with costs are given in United States of America dollars ($ U.S.). Where applicable, a conversion is listed for the local country currency, at the rate effective at the time that the particular study was undertaken.

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