Four pocket barometer/altimeters, the first by 'Wilh. Maess, Dortmund, Compensirt no. 1942', minus 200-2600 metres, with a compass in the case lid, 5.4cm diameter, the second a brass 'watch case', 0-8000 feet, 5cm diameter in leather case, the third a double-sided compendium with a mother-of-pearl compass and circular thermometer, 0-17,500 feet, by F L West, 31 Cockspur Street, London, 6.6cm diameter 2.4cm deep, and the fourth in a brass case with vernier scale, by 'Yeates and Sons, Optician, Dublin', 4.8cm diameter 1.2cm deep in a leather case (4)