Ogle’s aphemetric compass: a mystery solved
A huge thanks to Robert Pilla of the Drawing Instruments group for helping me solve the mystery of my Elliott Bros dial dividers posted back in January. His reference to…
Dial M for Measure
As the saying goes, you wait ages for a London bus and then two come along together. The same would appear to hold true for Elliott Bros dividers with a big…
Purple Reign
Tangentially to my recent post on Bagshaw's patent diagrammeter, I was reminded of something that had always puzzled me, but until now had not seemed of any particular significance. As…
Inglorious Bagshaws
Occasionally I will buy something without bothering to find out what it is first, especially if the price is right. Today's post concerns a recent acquisition that falls into this…
A Christmas Ca-rule
... but at the first sound of "God bless you merry gentlemen! May nothing you dismay!" Scrooge seized the ruler with such energy of action, that the singer fled in terror…
Stanley’s first planimeter (part 3)
As November draws to a close, it seemed an opportune moment to conclude my investigation of Stanley's planimeter, at least so far as the instrument itself is concerned. One of…
Stanley’s first planimeter (part 2)
My last post ended with a slew of questions that I had intended to address in a second instalment, but as I began to assemble the evidence it quickly became…
Stanley’s first planimeter (part 1)
November 16th 2023 marks the bicentenary of Jakob Amsler-Laffon's birth - at least according to the more trustworthy sources - so it seemed only fitting to save a rather special…
A Stanley puzzle
The subject of this post is yet another ebay purchase, this time made purely on the basis of a name on a box. Described as geometrical models for teaching, the…
Mechanical Pencil Month – Day 20: Mordan’s Bicentennial
The final day of our countdown has arrived which means it is time to go back to where it all began. By that I don't just mean Hawkins and Mordan's…