Two degree, counter-posed wedges, seem like a good starting point for our first attempt at an adaption of Mr. Philon’s souped-up torsion machine.

 

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Those extra long wedges will be trimmed to length after the fine tuning is completed.   For experimental purposes the washers will also be capable of fine rotational adjustments.  There are 16 holes in the washers, each 22.5 degrees apart.   There is a 3 hole pattern in the vernier plate*,  with each hole set 15 degrees apart, so that the washers that control spring rotation can be locked down every 7 1/2 degrees.   The second set of three holes is so that there can be two locking pins for each station.   Next will be the radiused pusher bar that sits on top of the wedges.  And then on to springs and limbs.

 


*Counter plate, or counter washer, if you will.  I prefer “Vernier plate” as the Ampurias finds, whose geometry we are mimicking here, seem to contain the first deliberate use of a logarithmic scale similar to a modern day Vernier.

2 Responses to “Wedges”


  1. John Payne says:

    Looking forward to your return to the blog, and giving a voice to all those ancient engineers who can’t themselves speak to us about how exactly these machines were made to do what they did so ruthlessly well. I am a month or to deep into the wedges totally redesigned for vlad and making shots. Trying to keep the washington state ballista connection alive. Hope u r well J.P.


  2. Charles W. Fink says:

    I check your page every now and then. I hope your health is good. I gather you were born in the UK, so you may have some early insight into the present reality. They say it takes three generations to forget, so I’m afraid it might be about that time again. Will we ever learn?

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