Mechanical Pencil Month – Day 10: Mordan’s Centennial
We have already reached the halfway point of our countdown to the bicentenary of Hawkins and Mordan's 20 December 1822 patent for the first mechanical pencil. It therefore seemed appropriate…
Mechanical Pencil Month – Day 9: The inimitable Tekagraph
There's no mistaking today's pencil, that icon of space age design, the Tekagraph 9603 by Faber-Castell. Instantly recognisable by its two dramatically different halves - a curvilinear grip section colliding…
Mechanical Pencil Month – Day 8: The Interlock Pencil
Today's post asks the question: What makes a mechanical pencil? Day three's Nestler with its complex double-push action definitely qualifies; the simple cedar pencils of day two, clearly not. Going…
Mechanical Pencil Month – Day 4: The Eversharp 4 Square
Day the fourth be with you! On that note, it's hard to think of a more quadratic pencil than the Eversharp 4 Square. This was a mechanical pencil of square…
Mechanical Pencil Month – Day 3: Nestler’s German silver screws
As promised, today's entry brings together Slide Rule Saturday and Mechanical Pencil Month in the hope of fostering a new spirit of love and cooperation between the two rival kingdoms.…
Mechanical Pencil Month
While digging around in the Repertory of Arts for Brunel patents, I came across a familiar design from the early 19th century. Granted to civil engineer John Isaac Hawkins (inventor…
Sketchy calculation
As a bit of weekend fun, here's something called a Rechenstift - German for "calculating pen" - by the venerable Hamburg firm of Dennert & Pape, erstwhile inventors of the…
Class of the Titans
A recent discussion about instruments named after mythological figures brought to mind the "Titan" Combination Compass, a simple design that aimed to provide a full drawing set in a box.…
Rules are made to be broken
When is a rule not a rule? When it's four rules! This deceptively simple rolling ruler offers an unexpected "twist" on the conventional design. Made of what appears to be…
More patent sticks
Here is a trio of glorified wooden sticks for ruling parallel lines that each somehow managed to secure patent protection. Two are so similar that they could easily be mistaken…