Hello Dince and Mod Alan M
I have always found these odd but interesting machines.
There seems to be little information 'out there' on them.

The VHGMC is probably the best starting point: -
http://www.vhgmc.co.uk/photo-galleries/atco/

Both the Atco Boat Propellor and the Atco Scythe appear to be
post-WWII designs, selling here from the late 1940s.

[Sir Chook has discovered the Atco is an inter-war design (below)]

Please let us know how you go with this one.

All the best
-----------------------------
Jack

Attachments
1949_04_smh_13april_p7.jpg (280.38 KB, 102 downloads)
1950_11_chronicle_16november_p51.jpg (93.62 KB, 103 downloads)
1952_09_mail_27september_p12s.jpg (78.9 KB, 102 downloads)
Last edited by CyberJack; 12/03/18 04:22 PM.