No hay muchas reglas por el uso en el campo, pero por exemplo:
DRAINAGE SLIDE RULE (en producion, pedir ordines:
http://www.extension.umn.edu/distribution/cropsystems/DC7688.html)
SLIDE RULE FOR BASIC TRACTOR CALCULATIONS (Hyatt Roller Bearing Company)
CATTLE BREEDING SLIDE RULE (ARISTO!!)
PIG BREEDING SLIDE RULE (UTO)
SLIDE RULE FOR CALCULATING NITROGEN RATES FOR CORN EC168 (UNL) en producion
http://cropwatch.unl.edu/web/cropwatch/archive?articleId=.ARCHIVES.2009.CROP5.SLIDE_RULE_INSTRUCTIONS.HTMSLIDE RULE FOR CORRECTING ELECTRICAL RESISTANCES OF SOIL MOISTURE BLOCKS (Michigan Agricultural Experiment Station and U. S. Department of Agriculture)
RAFTER CALCULATOR (EASTERLY o PICKETT 1082-ES)
SLIDE RULE CATTLE GAUGING (James Tree & Co, London)
SLIDE RULE CATTLE MEAT MESURE (Ewarts)
MEASURING TAPE AND CATTLE GAUGE (Rabone)
MEASURING TAPE AND CATTLE GAUGE (Chesterman)
WRIGHT CALCU-MEAT-ER!! (imaginar el uso!)
CIRCULAR SLIDE RULE DAIRY AND BEEF CATTLE PROFIT (NEW HOLLAND CO)
SLIDE RULE FOR COMMON CARP FEEDING (Israel-Marek, 1975 aun no propiamente agricola)
Mas:
Unas reglas que se basan sobre la "Richmond’s milk scale" y estas las tengo
A Slide Rule for Predicting Weight Gains of Beef Cattle, Fed Grass Silage with or without Concentrates, from Starch Equivalent Values Based on Laboratory Analysis for Digestibility and Dry Matter Content
Por otras hay que investigar ... esperamo veer una presentacion por IM2014!
Rurales saludos, en la foto un protosardo agricolo con su regla: