Kilns for making bricks and pottery constitute common remains of ancient activities, and as such they represent valuable objects for archaeological work. Techniques based on the study of remanent magnetism of bricks, pottery and baked soil can provide a means for datation and correlation of these remains. A study of a modern brick kiln is here presented. It is found that these materials are reliable recorders of the direction of ambient Earth’s magnetic field at the time of heating-cooling. There are however some potential sources of error, since temperature measurements indicate strong gradients, with places at less than 40% the central temperature of the kiln. There, the remanence is a partial-thermoremanent magnetization, and its use for archaeointensity determinations could lead to errors. The directions of remanent magnetism from all places sampled reproduced within the statistical uncertainties of the technique the observed geomagnetic field direction.Investigaciones arqueomagnéticas en restos arqueológicos, tales como cerámica, ladrillos, hornos y arcilla cocinada, pueden proveer datos valiosos para la datación y correlación en arqueología. En este trabajo se reportan resultados de un horno moderno, para fabricación de ladrillos. Los materiales estudiados contienen registros fieles del campo magnético ambiental, al tiempo del calentamiento. Dentro de las fuentes potenciales de error, se tienen variaciones en el equilibrio térmico dentro del horno. Ello puede afectar los trabajos de determinación de intensidad, pero las determinaciones de la dirección no son aparentemente afectadas.