Dating bardou telescopes
Dollond telescopes were among the most popular in England and abroad for more than years. Lord Admiral Nelson carried one.
He began his apprenticeship first with the optician Thomas Pons and later with John Peirce after which he commenced business in his native city. Two years later his father joined him in the venture.
It is displayed with a right angle eyepiece for celestial observations. Cleverly, the sailor left a hand hold on the wood in the proper position for supporting the telescope when viewing. There are also four different density solar fillters that screw onto the eyepieces. The ad shows a pair of spectacles.
The objective and ocular ends both contain their original, functional dust slides. See image of four eyepieces, tubes, and solar filter, not shown. There is rack and pinion focusing using the knurled knob on the right side of the main telescope tube near the eyepiece end. After successfully defending a legal challenge of his patent, Dollond's business flourished.
Later telescope makers rolled their lenses into a brass seat to firmly secure them. His reputation and the fact that his father was a member of the Royal Society, afforded them access to the best raw materials available at the time for their manufacture. In addition, the lenses are simply loose and screwed into their retainers with a threaded ring.
Widdifield, Optician, located at No. There are no indications that the firm manufactured any of the instruments sold, although further research would be needed to confirm this.
Note the telescoping stabilizers to reduce vibration and boxwood and brass altitude and azimuth adjusting wands. Peter apprenticed to his father in the trade, but his father's amateur interest in optics inspired him so much that in he opened an optical shop in London. There are two terrestrial erecting eyepiece tubes and five astronomical eyepieces. Instruments that appear to postdate are known.
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