A double American rifle with two barrels and only one trigger ; the right barrel straight, the left with a half winding. ... A gold watch, enamel dial, independent seconds, and metal thermometer ; twenty holes in rubies, compensation balance. ... This collection contains common and repeating chronometers, tested and provided with official certificates from ... Sample of siliceous rock used in SWITZERLAND.
|Title||:||Official descriptive and illustrated catalogue of the Great Exhibition of the Works of Industry of All Nations, 1851|