Mid Eighteenth Century Non Achromatic Decagonal Reverse Taper Telescope by John Gilbert Surveyors Barometer The inner lid contains a

The inner lid contains a second dial which is employed as a wind disc or cyclometer to be used in conjunction with the barometer when a storm is identified

the trademark now rests under the ownership of Carlsberg Breweries

The back is etched with both the manufacturers name

Circa 1755

but also in what direction the destructive centre of the storm is moving

Mid Eighteenth Century Non Achromatic Decagonal Reverse Taper Telescope by John Gilbert Surveyors Barometer The inner lid contains aFor 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