The bright-work components are all nickel/chrome plated and have polished up really well. This Watson Bactil has rack and pinion main and vernier screw/cam fine focusing, both of which move smoothly with hardly any evident wear.
This example is supplied with 6x and 10x magnification Watson eyepieces. This example is fitted with a rotating Watson quadruple nose-piece which clicks into position positively as each objective is rotated to its viewing position and comes supplied progressive magnification period Watson objective lenses, as follows.Watson para 40mm - 4x - Watson para 16mm - 10x. Watson para 4mm - 40x. There's therefore an effective magnification range with all the supplied optics of around 24x to 400x with good illumination.
The fully mechanical circular specimen stage set-up is a really well-engineered feature that has rack & pinion and helical screw systems that move both the x-axis and y-axis smoothly, together with silvered vernier measurement scales on the axes. The stage also rotates a full 360 degrees and also has centering - the rotation in nicely damped with just the right level of resistance to motion and I've shown the stage in various stages of rotation in the listing photos. The stage-clip system for holding slides in place during viewing is present and has a sprung arm which arm retains adequate resistance in its armature to hold a slide in place while the x and y-axes are being moved around and if you're using inclined viewing.
There's a little evidence of wear to the black painted finish on the frame and stage surface which isn't that noticeable, another indicator of fairly light use over the years. Below stage there is a Watson Aplanatic condenser with centering adjustment and a working iris for controlling lighting levels that moves freely. The whole condenser assembly is on a rack and pinion mount for vertical adjustment. This example is fitted with an over-size plano-concave mirror for illumination which is on an adjustable arm and gimbal set-up, with good silvering to both sides.There's also a low voltage lighting solution with transformer which converts 240V mains to 6V DC and a Watson illuminator that just slots into the same recess that the mirror fits into - a neat Watson solution. The lamp-house contains a 6V 18W tungsten bulb and you can see it working in a couple of the listing photos, giving a great alternative lighting option. All-in-all this is a really well presented, highly original and pretty well complete example of a retro Watson Bactil monocular model with its comprehensive technical set-up, period look and good cosmetic condition with just the right level of patination to its paintwork for a late 1950s example. This instrument will make a great usable addition to a collection as well as making a spectacular and imposing retro display piece. If you've been looking for a vintage Watson Bactil monocular for a while, this example definitely merits a really close look.
Thanks for looking - please check out my other listings if you get a chance. This item is in the category "Antiques\Science/Medicine\Scientific Instruments".
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