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Challenge Model Microscope by Swift & Son
For sale, a cased Challenge model microscope with accessories by Swift & Son of 81 Tottenham Court Road, London.
A very good example with numerous accessories. This model was probably better described in Carpenter’s, “The Microscope and its Revelations” of 1883
Swift's Challenge Microscope. - The instrument constructed under this designation by Messrs. Swift, is one of which it may be fairly said that it is surpassed by no other of its price in the excellence of its workmanship, and its suitability to the general wants of the Microscopist. The support on which it is hung is extremely firm and substantial without being heavy and when the limb is brought to the horizontal position, resting on the cross plate between the two uprights, the instrument is still well balanced. The rack and pinion movement is made with oblique teeth a construction which favours smoothness and sensitiveness in the adjustment, so that a l/4th inch objective may be focused by it alone. The fine adjustment is made by the milled-head at the lower end of the body. - It is a peculiarity in this instrument, which especially fits it for those who work much with Polarized light, that the analysing prism is fitted into the body above the Wenham prism, in such a manner that, when its fitting is drawn out (without being removed), it is completely out of the way of the light-rays whilst, when the use of the Polariscope is required, the prism can be at once pushed into the body, working in conjunction with the Wenham prism. This mode of mounting the analyser is found to interfere much less with the definition of the objective, than the insertion of it between the objective and the Wenham prism. The stage rotates in the optic axis and may either bear (as in the figure) a sliding object-carrier, or may be furnished with mechanical actions. The mirror is attached to the stem by a crank-arm, allowing it to be so placed as to reflect light of considerable obliquity. Beneath the Stage is a broad horizontal dovetail groove, into which is very exactly fitted a firm (sprung) slide that carries a Sub-stage for illuminating apparatus, fitted with a vertical rack movement, and with horizontal centering screws this arrangement (devised by Mr. Swift) enables the Sub-stage to be placed in position or removed, without disturbing either the stage or mirror. The extremely ingenious Universal Sub-stage combining Achromatic condenser, Black-ground Illuminator, and Polarizer with varied adaptations-devised by Mr. Swift for this microscope, but capable of being applied to any other, will be described hereafter.
The Swift company was formed in 1854 by James Powell Swift who had previously worked for the famous optical instrument maker, Andrew Ross. Joined by his son, Mansell James in 1877, the company name was changed to Swift & Son and their trademark Swift (as in the bird) was registered. In 1903, Mansell James’s son, Mansell Powell John Swift also joined the company and just three years later in 1906, the founder James died.
In 1912 the firm became incorporated as James Swift & Son Ltd. Both remaining family members died a day apart from one another in 1942 and the firm became a subsidiary of ER Watts & Son Ltd which itself later became Hilger & Watts Ltd after taking over the business of Adam Hilger.
During the period of family ownership the Swifts were responsible for improvements to rack and pinion movements and fine focus systems on microscopes and for bringing the first petrological microscope using fixed stage and revolving coupled polariser analyser to the market.
They also provided Captain Scott with microscopes for his 1901-1904 expedition on the RSS Discovery. The microscope was subsequently named after the ship and appeared in their catalogues of the period.
Circa 1885
SellerJason Clarke Antiques
View all stock from
Jason Clarke Antiques
Private dealer
By appointment only
Newbury
Berkshire
Tel : 07815 046645
Non UK callers : +44 7815 046645
A very good example with numerous accessories. This model was probably better described in Carpenter’s, “The Microscope and its Revelations” of 1883
Swift's Challenge Microscope. - The instrument constructed under this designation by Messrs. Swift, is one of which it may be fairly said that it is surpassed by no other of its price in the excellence of its workmanship, and its suitability to the general wants of the Microscopist. The support on which it is hung is extremely firm and substantial without being heavy and when the limb is brought to the horizontal position, resting on the cross plate between the two uprights, the instrument is still well balanced. The rack and pinion movement is made with oblique teeth a construction which favours smoothness and sensitiveness in the adjustment, so that a l/4th inch objective may be focused by it alone. The fine adjustment is made by the milled-head at the lower end of the body. - It is a peculiarity in this instrument, which especially fits it for those who work much with Polarized light, that the analysing prism is fitted into the body above the Wenham prism, in such a manner that, when its fitting is drawn out (without being removed), it is completely out of the way of the light-rays whilst, when the use of the Polariscope is required, the prism can be at once pushed into the body, working in conjunction with the Wenham prism. This mode of mounting the analyser is found to interfere much less with the definition of the objective, than the insertion of it between the objective and the Wenham prism. The stage rotates in the optic axis and may either bear (as in the figure) a sliding object-carrier, or may be furnished with mechanical actions. The mirror is attached to the stem by a crank-arm, allowing it to be so placed as to reflect light of considerable obliquity. Beneath the Stage is a broad horizontal dovetail groove, into which is very exactly fitted a firm (sprung) slide that carries a Sub-stage for illuminating apparatus, fitted with a vertical rack movement, and with horizontal centering screws this arrangement (devised by Mr. Swift) enables the Sub-stage to be placed in position or removed, without disturbing either the stage or mirror. The extremely ingenious Universal Sub-stage combining Achromatic condenser, Black-ground Illuminator, and Polarizer with varied adaptations-devised by Mr. Swift for this microscope, but capable of being applied to any other, will be described hereafter.
The Swift company was formed in 1854 by James Powell Swift who had previously worked for the famous optical instrument maker, Andrew Ross. Joined by his son, Mansell James in 1877, the company name was changed to Swift & Son and their trademark Swift (as in the bird) was registered. In 1903, Mansell James’s son, Mansell Powell John Swift also joined the company and just three years later in 1906, the founder James died.
In 1912 the firm became incorporated as James Swift & Son Ltd. Both remaining family members died a day apart from one another in 1942 and the firm became a subsidiary of ER Watts & Son Ltd which itself later became Hilger & Watts Ltd after taking over the business of Adam Hilger.
During the period of family ownership the Swifts were responsible for improvements to rack and pinion movements and fine focus systems on microscopes and for bringing the first petrological microscope using fixed stage and revolving coupled polariser analyser to the market.
They also provided Captain Scott with microscopes for his 1901-1904 expedition on the RSS Discovery. The microscope was subsequently named after the ship and appeared in their catalogues of the period.
Circa 1885
Price The price has been listed in British Pounds.
Conversion rates as of 18/NOV/2024. Euro & Dollar prices will vary and should only be used as a guide.
Always confirm final price with dealer. Sold
Category Vintage Technology
Period Late Victorian Antiques
Origin English
Maker J. Swift & Son
Item code as542a341
Status Sold
£0 
$0.00 
€0.00 
$
€
Conversion rates as of 18/NOV/2024. Euro & Dollar prices will vary and should only be used as a guide.
Always confirm final price with dealer. Sold
View all stock from
Jason Clarke Antiques
Private dealerBy appointment only
Newbury
Berkshire
Tel : 07815 046645
Non UK callers : +44 7815 046645
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