A simple microscope warm stage

Microscopical examination of cells, particularly spermatozoa, often necessitates the preservation of a temperature of 37 degrees C on the stage itself. A microscope warm stage should provide a surface at this temperature and allow microscopical examination of a series of pre-warmed sample slides. A further desirable quality would be the total absence of ancillary apparatus. An apparatus has been designed and built which effectively provides these features. It measures 10.5 x 6.5 x 1.3 cm, weighs 320 g with wiring and plug and provides a thermostatically controlled temperature of 37 +/- 0.5 degrees C 5 min after connection with the electrical supply (240 V A.C.).