A pocket barometer/altimeter, unsigned, late nineteenth century, in a leather case. It reads from 21 to 31 inches of mercury or 0 to 10,000 ft, and is compensated. There is a small pointer attached to the bezel, which can be rotated and set to the pressure at the start of a climb. The difference between this reading on the fixed altitude scale and that shown by the hand at the end of the climb will be the change in height. The 1 3/4” diameter, brass case is gilded and the dial is silvered.
A pocket barometer/altimeter, unsigned, late nineteenth century, in a leather case, the top of which is missing. It reads from 26 to 31 inches of mercury or 0 to 5000 ft. It is Compensated. The altitude dial can be rotated to set the zero to the pressure reading at the start of a climb - the bezel is milled to facilitate this. Approximately 2 3/4” diameter. The brass case is gilded. The dial is silvered. In good working order although very dirty and tarnished when purchased.
Holosteric barometer, circa 1880, believed at one time to have been used on a ship. Open dial (card) showing typical late nineteenth century movement. 5” diameter. In good working order, my reference barometer, checked periodically against local AOL weather forecast figures.
Soviet barograph type ГOCT6359-52 serial no. 1962-IV 8966. This barograph is a compact instrument, constructed on a metal base plate and housed in a bakelite case, with glass windows, which hinges up to the left to expose the movement. The bakelite drum is driven by 8 day clockwork. The serial number suggests that it dates from 1962 and, if my understanding of Soviet type codes is correct, the specification dates from 1952. The movement is robustly constructed with a five capsule stack. The pen arm is considerably shorter than on the standard type of English barograph but fortunately the drum size is the same. It has a fibre tip pen.
Casella cat no E8270/Z/2 thermo-hygrograph serial no 013672 with Gluck eight day clockwork movement. The temperature sensor is a bi-metallic coil whilst humidity is sensed by multiple strands of hair stretched below the base plate. It has fibre tip disposable pens and is used to record the temperature and humidity in my collection room. Probably 1960s/1970s date, another similar one has a quartz clock movement instead of the clockwork one.
Damp meter, housed in a leather pocket case signed Norman Stewart & Co, 223 Oxford Street, London. Meters like this were sometimes used by travellers to check whether beds were damp or not!
A selection of instruments used to measure or record: atmospheric pressure and/or altitude; temperature; and humidity.
