This paper describes the design and development of a novel vibrating-reed technique for thermogravimetric analysis (TGA). The system can provide thermogravimetric data for samples in a well-mixed state, thus overcoming the heat transfer problems associated with conventional instruments. Other advantages include low cost of manufacture, robustness and ease of operation. Preliminary data are reported for the thermal dehydration of CuSO4.5H2O, CoSO4.7H2O and NiSO4.7H2O in the range 20-500-degrees-C. A typical mass resolution for 0.5 g samples is better than +/- 1.5%.