Builder R. Lascelles & Co. Ltd. of London offered its Lascelles fan-shaped engines together with Weiss propellers in an appropriate combination. It was in 1910.

“Lascelles ad”

From Appendix 6: We located a photograph in Flight in which an engine of this brand appears installed on an airplane very similar to the Demoiselle de Santos Dumont.

“Lascelles installed” (PiP)

From Appendix 10: Ad with two views of the fan-shaped engine.

“Ad with two engine views”

“Enlarged rear view”