Revolution and Speed indicator, Mk. IV. Fitted to Casella Instrument Board Revolution and Speed indicator
Bent-stem earth thermometer by C.F. Casella and Co. Ltd, c. 1925. Bent-stem earth thermometer by C.F. Casella and Co. Ltd 1925
Earth thermometer, maximum and minimum, mercury and alcohol-in-glass, fahrenheit, tube bent 8 inches above bulb. Made by C.F. Casella and Co. Ltd, London. Marked MO 18203, 8974 and NPL25 certified in 1925. Min scale 20 to 125, max scale 15 to 100 Earth thermometer
Minimum thermometer, spirit-in-glass, sheathed, degrees absolute, by C F Casella & Co Ltd, London. Marked MO5, KO with handwritten label "Constantly getting out of order Jan 26/17" . Scale 240 to 310. Dated 1917 Minimum thermometer 1917
Frame for whirling psychrometer, by Casella, London. Used by Home Office Scientific Advisory Branch. Frame for whirling psychrometer 1920-1940
Three packets of hygrometer wicks, T8568/2, T8750/1, T6420/1, C 1966 Three packets of hygrometer wicks [1966]
Field Meteorology Set, Mark III, by C.F. Casella and Co. Ltd, in carrying case, 1942. With calibration charts, tables for logarithms and relative humidity, and a 1942 Observer's Handbook. Field Meteorology Set 1942
Spirit level by C.F. Casella and Co. Ltd., London, with Mahogany box and leather case no. 8314, early 20th century Spirit level by C.F. Casella and Co. Ltd.
5-inch transit theodolite by Casella, 1924, complete, in two fitted boxes: (base) 36 x 26 x 24cm, (optics) 30 x 22 x 23cm 5-inch transit theodolite by Casella 1924
Electric cup anemometer and portable receiver, 1924, M.O. pattern. Electric cup anemometer and portable receiver 1924