Mid Eighteenth Century Non Achromatic Decagonal Reverse Taper Telescope by John Gilbert Surveyors Barometer The inner barometer dial has

The inner barometer dial has a scale measuring 27

a common occurrence for such small and specialist organisation of the period

John Peter Biester as the chosen maker for his “Portatoris”

Gilbert also maintained close relationships with the Dollond and the Ramsden families and the Gilbert family’s visits to their properties are noted around this time

Mid Eighteenth Century Non Achromatic Decagonal Reverse Taper Telescope by John Gilbert Surveyors Barometer The inner barometer dial hasFor sale, a mid eighteenth century, non achromatic decagonal reverse taper single draw marine telescope by John Gilbert of Tower Hill London. This super example has a one inch non achromatic single objective lens with original dust slide and measures 38 inches closed and 46 inches extended. The mahogany ten sided tapered barrel holds a single draw tube containing five lenses and is completed with a bulbous type eyepiece with dust slide, common during