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Read more about the article Stanley’s first planimeter (part 3)

Stanley’s first planimeter (part 3)

  • Post author:Alan Williams
  • Post published:November 30, 2023
  • Post category:Planimeters
  • Post comments:0 Comments

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…

Continue ReadingStanley’s first planimeter (part 3)
Read more about the article Stanley’s first planimeter (part 2)

Stanley’s first planimeter (part 2)

  • Post author:Alan Williams
  • Post published:November 25, 2023
  • Post category:Planimeters
  • Post comments:0 Comments

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…

Continue ReadingStanley’s first planimeter (part 2)
Read more about the article Stanley’s first planimeter (part 1)

Stanley’s first planimeter (part 1)

  • Post author:Alan Williams
  • Post published:November 16, 2023
  • Post category:Planimeters
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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…

Continue ReadingStanley’s first planimeter (part 1)
Read more about the article Stanley-Amsler double act

Stanley-Amsler double act

  • Post author:Alan Williams
  • Post published:November 14, 2023
  • Post category:Planimeters
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Like the previous post's Amsler Type 6 with its added spikes for engine indicator diagrams, today's planimeter is another general purpose instrument with a special trick up its sleeve. Patented in…

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Read more about the article Happy 200th Amslerversary!

Happy 200th Amslerversary!

  • Post author:Alan Williams
  • Post published:November 11, 2023
  • Post category:Planimeters
  • Post comments:0 Comments

While doing a bit of planimeter research, I noticed that Wikipedia gives the date of 11 November 1823 for Jakob Amsler-Laffon's birthday - 200 years ago today! Amsler was a…

Continue ReadingHappy 200th Amslerversary!
Read more about the article Tangram alphabet

Tangram alphabet

  • Post author:Alan Williams
  • Post published:December 31, 2022
  • Post category:Miscellany
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Thanks to a comment on the previous post by Erick, my attention was drawn to the instruction booklet that accompanied Dr Richter's Anchor Puzzle. This puzzle was essentially a repackaged…

Continue ReadingTangram alphabet
Read more about the article Mechanical Pencil Month – Day 20: Mordan’s Bicentennial

Mechanical Pencil Month – Day 20: Mordan’s Bicentennial

  • Post author:Alan Williams
  • Post published:December 20, 2022
  • Post category:Pencils
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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…

Continue ReadingMechanical Pencil Month – Day 20: Mordan’s Bicentennial
Read more about the article Mechanical Pencil Month – Day 17: Slide rules, OK?

Mechanical Pencil Month – Day 17: Slide rules, OK?

  • Post author:Alan Williams
  • Post published:December 17, 2022
  • Post category:Pencils
  • Post comments:0 Comments

Another Slide Rule Saturday rolls around (whatever happened to the last one?) and having already used up my only slide rule pencil as well as my only pencil with slide…

Continue ReadingMechanical Pencil Month – Day 17: Slide rules, OK?
Read more about the article Mechanical Pencil Month – Day 12: Twelve leads a-leaping

Mechanical Pencil Month – Day 12: Twelve leads a-leaping

  • Post author:Alan Williams
  • Post published:December 12, 2022
  • Post category:Pencils
  • Post comments:0 Comments

For the twelfth day of Christmas Mechanical Pencil Month, I present a whistlestop tour of twelve lead refills from my collection of [insert large number here]. They have been arranged…

Continue ReadingMechanical Pencil Month – Day 12: Twelve leads a-leaping
Read more about the article Mechanical Pencil Month – Day 10: Mordan’s Centennial

Mechanical Pencil Month – Day 10: Mordan’s Centennial

  • Post author:Alan Williams
  • Post published:December 10, 2022
  • Post category:Pencils
  • Post comments:0 Comments

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…

Continue ReadingMechanical Pencil Month – Day 10: Mordan’s Centennial
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  • Stanley’s first planimeter (part 3)
  • Stanley’s first planimeter (part 2)
  • Stanley’s first planimeter (part 1)
  • Stanley-Amsler double act
  • Happy 200th Amslerversary!

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