Ian, have a look at the forum on the homewokshop.org site for a post dated 23 jan. titled Elliott 3 1/2 dividing head. The repondent Peter turned out to have the full kit for a larger head, 4 or 5 inch so can give dimensions for scaling. I don't think the spacing between slots has a material effect unless you are trying to be authentic.

What size taper is in the nose MT4?
What is the C washer used for?
Does anyone know if the Elliott/Victoria style plate lock (a pin on the rear) was intended for compound indexing as I have only seen double sided plates mentioned in connection with a Cincinnati head? A few extra locking holes in a standard plate could add extra range with minimal effort.

I take it you know the standard set of gears listed for the tables in Machinery Handbook, B&S and Elliott data are 24,24,28,32,40,48,56,64,72,86,100 though a 60 is also used for 201 divisions. The 86 gear is ony used for the 106 train so of limitted value. Of course the ratios can mostly be produced with other gears too but it is amazing how they managed to work all the tables out to use the minimal set of gears before computers were invented.

If you are interested I have transferred the Victoria differential indexing tables into Excel for convenience.

…^…neil…
Or certainly more persistent. …

It is actually not very hard to work out a setup for any desired division with a differential dividing head. I covered how to do it in the article I submitted about four years back on converting a Vertex BS0 head.

Ian, please pm me your email address and I will send it to you. I tried uploading it to the site but it won't accept files even disguised as jpegs.

Only some humans are clever, ordinary decent folk are baffled by maths and other sorceries! Right-thinking chaps know the best way to deal with swots, long-hairs, expurts, and intellectuals.

Presumably astronomers predicted astral events with the reliable solar calendar and then converted it into whatever system the rest of us were using?

In the west, the civil calendar was the Julian calendar (introduced in 46BC) until 1582 when replaced with the Gregorian calendar. Although the Julian calendar was nearly right, it made the year 365.25 days long, and accumulated an error of 1 day every 128 years.

After 1600 years, the difference between the calendar and the seasons was hard to ignore but being a ghastly foreign innovation, the Gregorian calendar was ignored by the British until 1752. (The old ways are the best.)

Even when the year starts has changed in Britain to bemuse the population. The Anglo-Saxon year started in September (after the equinox), then moved to the Winter Solstice (25th December), then 1 January (Catholic) , then 25th March (Equinox), finally back to 1 Jan in 1752. The UK government's Financial Year starts 1 April, a hangover from the spring equinox, useful because all the start-stop accounting doesn't land on a holiday.

Meanwhile, due to being retired and the Corona lock-down, I'm not sure what day it is any more!

Dave

Doh! Duplicate.

Edited By Mick B1 on 18/04/2020 11:21:19