JHOLLAND1
Titanium
- Joined
- Oct 8, 2005
- Location
- western washington state
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Thanks for posting this, I've only seen pictures of an ellipsograph in prints and books ~ from 1810 not surprising the reserve price is nearly $6k … At auction with two or three people really wanting it could crest over $9k.3--------------------------
Yes, I was wondering how the level was 'preloaded' . It can certainly show 'where' the anvil is , but is unable to apply a consistent force on its own. It's unlikely to be spring loaded (springs being unreliable things) . Could it be weighted perhaps?Whitworth originally aimed to ensure a consistent anvil force by using a 'feeler' (described in Shelley's book) inserted between the workpiece and the anvil.
What I don't understand is that although the spirit level could detect movement with any required level of sensitivity, it does require a finite amount of movement, and how do you know much to correct the measurement by?
Let's hope someone equally knowledgable bought it , not someone wanting a steam-punk ornament!If only Rivett had bought it!
Where were these sales? I follow lots of sales in the UK but missed this one. Would have bought the Whitworth in a second for that price.
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