Kennan  machines tools were aimed at both the impecunious and wealthy the amateur (and small workshops) and included a small bench planer, plain-turning and very fine quality ornamental turning lathes and accessories (including their complex universal geometric cutter) drill presses, a circular sawing machine and what was described as a:  Machine for copying works of art, etc.,  from the round or flat, upon any scale, in ivory, wood, alabaster, etc. It is easily worked by one person. The movement for copying proportional straight lines is unique. The cutting is performed by a revolving tool, mounted on a bar with universal centre, and guided by a tracer applied to the original. It will copy the most intricate forms. This might be the machine mentioned in the "Report and Adjudication of the Judges on the Exhibition of Irish Manufacture, Produce and Inventions" published in 1847. It was described as a 'sculptor's carving machine' and invented by one Charles Shaw and made by Kennan to his design.
The photographs of this machine, donated by a generous reader, were found mounted together in a wooden frame and might well have been displayed in the Kennan works.
The photograph above is annotated "front view"  - of which there were two slightly different ones - and others shown below.
At the bottom of the page is an example of other work by Keenan & Sons, a memorial to Our Lady at the side of a road in Poland, SE of Warsaw..