While the illustrated engine probably was built as a stationary engine, there does not appear to be any record of Sarolea building these. It also bears some resemblance to several early single cylinder car engines of about six horsepower by makers like DeDion, Renault and Peugeot, but I can't find any close matches. These would have been bolted rigidly to the chassis with a similar mounting to that shown. The radiator was often behind the engine so cranking access was no problem. Most of these engines would have had a battery and coil with a make and break arrangement for the ignition.
I suspect that the magneto and carburettor on the illustrated engine are not original. It would be interesting to know whether the fasteners are metric or imperial.
The Sarolea logo is quite distinctive though. I wonder whether they did build a run of stationary engines, or perhaps built a small run of cars in their early days, or built some engines for another car manufacturer.
Frank.
Eric posted the above while I was typing this.