Sunday, February 26, 2012

Laminated Bamboo Multi-Function Eco-friendly Bicycle Computer

Handlebar mount for Versalog 1460 Multi-function bicycle computer

I finally got around to road testing my bicycle computer, a Post Versalog model 1460 made in November, 1956. It is of laminated bamboo construction, with a celluloid slider, and engraved markings. More complete information about this versatile and powerful calculating machine is available on this site.

Rack-mounted, attractive leather case, goes well with Brooks saddles and Carradice bags

A brief sampling of its many and varied capabilities include:

  • Distance
  • Speed
  • Bicycle gear inches, gain ratio (see Sheldon Brown here)
  • Frame mitres, angles, and tube lengths
  • Trig, engineering, physics, chemistry, bridge design, trajectory, orbital mechanics
  • Sustainable and eco-friendly! (renewable bamboo construction, no batteries)

Close-up of rack mount / belt loop attachment system
Edge view of the laminated bamboo bicycle computer, along with the second best manual ever written (HP-15C = #1)

Preparing to calculate some gain ratios

This post brought to you by the One Speed: GO! Institute for Retrogrouchery Studies (OSGIRS) where our motto is "HEY! You kids locked up in your rooms texting and tweeting! Come stand on my lawn! I have sports equipment including but not limited to bicycles, baseballs, footballs, frisbees, lawn darts (the old heavy dangerous pointy type!), volleyballs, and even badminton, and I invite you to go to a place called "outdoors" and enjoy what used to be called "physical activity." Please note that some math may be taught in the process. Those allergic to fresh air, sunshine, physical activity, and the actual physical presence of other humans should take necessary precautions.


  1. You forgot to mention that it has an automatic rounding feature as well!

  2. Love it!
    Just remember folks, don't operate the computer while in motion!

  3. I have never even heard of that.

  4. Ha! On a bike forum, we were just talking about these hand-held calculators of days gone by, and I linked to a picture of the Full Sized Model. Got some laughs, but got some BETTER laughs when I related my son's question the first time he saw one of these:

    "Wow. What size batteries did it use?"

    1. Some math teachers used to have full-sized models on the wall in the classroom. Not just to teach slide rule usage, but to talk about logarithms, and numbers in general. Next to one of these babies, the plain old number line seems like something which ought to be conquered in kindergarten, so that you can move on to more interesting things. I despair when I see third graders staring blankly at a simple number line when they are just about at the point where they could be conversant in deleted neighborhoods.


Please feel free to comment here, almost anything goes, except for obvious spam or blatantly illegal or objectionable material. Spammers may be subject to public ridicule, scorn, or outright shaming, and the companies represented in spam shall earn disrepute and ire for each occurrence.