They have hefty solid cast brass casings, scuttle clamps, bevelled glass fronts and brass hands with black subsidiary indicators on light cream faces. The movements are good quality – battery-operated quartz for the clocks and silvered aneroid for the barometers. Clocks have bold Roman numerals and use one AA battery. Barometers have stainless steel aneroid movements showing millibars and inches of mercury. Outside diameter 5.5″, face diameter 3″, depth 1.75″.