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Vintage J. Swift & Son - Monocular Polarising Microscope #24818 - circa 1960s

$157.73 Buy It Now or Best Offer
free,30-Day Returns

Seller Store arcboutant
(1177) 100.0%,

Location: Glasgow
Ships to: US,
Item: 256714560193

Returns Accepted:ReturnsNotAccepted
Antique:Yes
Type:Microscope
Period:1951 to Present
Material:Brass

Normal 0 false false false EN-GB X-NONE X-NONE Here is an honest working example of a J. Swift & Son monocular transmitted light polarising microscope dating to the early 1960s, with a basic usable specification making it a good entry-level instrument. This model of Swift microscope often found its way into research/educational establishments owing to its robust solid construction and its good polarising capabilities. The instrument has recently been through a check-over and light lubrication, not that it really needed anything doing other than the fine focus freeing up and a bit of a clean, as it was gummed with age-hardened lubricant, but now moves freely. Turning to the main technical details of this basic vintage Swift monocular polarising microscope, we have: Construction is in steel, with U-shaped foot showing a bit of surface corrosion that’s just cosmetic, twin uprights, pivot, limb to which is attached the main optical tube, with stage and sub-stage attached to the limb tail-piece – a very solid design. The optics consist of a special chrome-plated eyepiece that’s fitted with cross-hairs that can be focused via a draw-tube and can be set to the vertical, or 45 degree off-set. The coarse focus system moves the main tube with smooth action that holds position on adjustment. Note that the microscope is designed to tilt and holds position well. Fine focus adjustment essentially also has a nice smooth action now that it’s been cleaned up and re-lubricated. There’s a single objective lens by Swift that screws directly into the optical tube. There are specific modifications for polarising functionality as follows: – special 6x magnification eyepiece with cross-hairs, focusing and off-set – analyser on in/out rotor – recesses for adding wave-plates with dust-cover – centering via two small chrome-plated thumb-screws – sub-stage polariser – described later in the listing The objective lens may be a specific polarising objective, although there’s nothing I can see to confirm this. This type of objective lens is usually described as «strain-free» or «stress-free» in the technical literature, what this means is that when the lenses are manufactured the glass is allowed to cool very slowly, so it therefore settles into its final shape over a relatively long period of time, giving the glass extra purity and fewer imperfections, which is why this type of lens is preferred for polarising applications. Polarising lenses are sometimes marked «POL» but not always and there’s no real consistency in how different manufacturers identify their lenses as strain/stress free. The objective lens with the instrument is as follows: 6.5x magnification 25mm by Swift – Ref 12280 The specimen stage is the circular rotating type with 360 degree graduations and smooth well-damped rotation that holds position on adjustment. There’s also a removable central section and a couple of slide clips which work very well for holding slides steady. Below stage there’s a rotatable polarising filter with external degree scale and smooth rotation – this can also be swung out of the optical path to allow use for non-polarising work. Sample illumination is provided via a sub-stage plano-opaque mirror with gimbal and very good silvering to the plano side, with the reverse side in a white opaque material which does reflect some light. The overall condition of this basic Swift polarising microscope is good with no significant maintenance or wear issues and just a few cosmetic points mentioned earlier in the listing. In summary, this is a usable vintage monocular polarising microscope with a fairly basic specification suited to low-power polarising applications, from well-known British optical firm J. Swift & Son. It’s essentially usable straight out of the box, with a bit of time invested in understanding how best to use its polarising function for viewing thin-section specimens of things like meteorites, other geological samples and other materials suitable for study using this technique. This microscope equipment will be partially dismantled, very well packaged for transport and dispatched by insured courier upon receipt of cleared funds. Overseas buyers please use eBay Global Shipping if it’s available in your territory or contact seller for options/costs. Thanks for looking – please check out my other listings if you get a chance.

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