The Marchant Pony pinwheel calculator

[@Xpian]

When I first found your website, then later your KZbin channel, my initial interest lie in (Felt & Tarrant) Comptometers and (Burroughs) Calculators, both basically the same from the operator's point of view, and both machines in which I had had experience working with in my late-teens. Seeing more of your videos, however, I find I'm further intrigued by some machines in which I have no background and not a clue how to operate, such as these pinwheel calculators. (I had seen slightly similar Monroe machines in my youth, not that I could operate them, but I had never seen a Marchant). Your videos are wonderfully clear in both explaining the nature of the machines, i.e. how they work, as well as explaining how to operate them. Thank you for this!

[@Xpian]

Now I'm curious; would you know if any of the companies which produced pinwheel-type machines also made any specific to (old) Sterling currency? Or for other non-base-10 specialised machines used for work in Imperial measures, for instance: Shipping weight in quarters, cwt's, and tons? Or for fractions (like some of the later Sumlock Comptometers; some even set for 'Time' to reckon the No. of hours worked & overtime for purposes of calculating payroll)? Thanking you in advance, Cheers!

[@jaapsch2]

The only non-decimal pinwheel I know of is the Odhner Lusid for Sterling currency (and its predecessor models). See my video: kzbin.info/www/bejne/n5_LqGRuatuVqtU

[@stephenfreeborn]

I bet they hoped their patents were enough to keep them out of trouble.

[@ChrisStaecker]

Nice- any idea what the weird dimpling is on the vertical posts at 3:50?

[@jaapsch2]

I have no idea what caused that pitting. The other machine's carriage does not have it. I think it must have been some kind of manufacturing defect, possibly poor casting.