We often talk and think about the Victorian era, and for many it stands alone as a brief period in world history when so much of what we know, use and take for granted in the 21st Century was invented or was the seed from which a much bigger idea blossomed in later years. Much of the inventiveness of the…
An original Negretti & Zambra leaflet c1910 with directions for setting up self-recording barometers (barographs), thermometers (thermographs), etc
Mark has recently enhanced his test equipment and is now able to film barometers under pressurised conditions. This short clip shows the unusual Casella pocket barometer, made for the Royal Geographical Society c1930, replicating the effect of descending from 25,000ft to 12,000ft – and it only takes 27 seconds! For more information about the RGS pocket barometer, click…
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