Tools and Machinery of the Granite Industry

The Chronicle of the Early American Industries Association, Inc. Vol. 59, No. 2: Tools and Machinery of the Granite Industry by Paul Wood A brief history of quarry drilling Ancient Egyptian Stone-Drilling Plug and feather

Pedal Strikes on Rollers

Recently failing with this because the rollers were too steep and abrupt, not flowy, the next logical limit is to consider pedal strikes as an option for roller peaks. A 100% strike-free roller isn’t possible because once you start to angle the bike from vertical/upright the pedal can strike the roller, especially if pedals are …

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The Fastest Rollers?

I added a little more to the Jump (and roller/drain) Design page by exploring the Brachistochrone and its application for rollers (more):

A “straightforward way to curtail the spread of Lyme disease…”

tick populations and the risk of Lyme disease can be cut substantially by maintaining the deer population below about 10 deer per square mile. When the population is below four deer per square mile, even the secondary effects of climate change become irrelevant to Lyme risk. Yet, the Maine Department of Inland Fisheries and Wildlife …

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Knot Science

There’s a whole field of mathematics that studies knots, to explore abstract properties of idealized curves. “But that’s not what you care about if you are, for example, a sailor or a climber and you need to tie something which holds,” says Vishal Patil, a graduate student at the Massachusetts Institute of Technology whose new …

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