Protractor Head Square Cleanup

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I just picked up an excellent vintage Brown & Sharpe No. 4 combination square protractor head and blade for $20. It was in good shape, just needed some cleaning and surface rust removal. Made in Rhode Island, it’s a high-quality, forged and hardened precision measurement tool. Not sure of the vintage.

These are great for transferring angles, measuring and marking at non-square (or square) angles along the length of the blade, and using the bubble level not just to check square, but determine the exact angle of out-of-square surfaces. The blade can flip to both edges on both sides, giving four different graduation sets.

Here’s a photo essay of my cleanup process.

I polished up some parts on a buffing wheel for my bench grinder.

Here’s the basic operation of the protractor head, as demonstrated by my filthy hand.

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2 thoughts on “Protractor Head Square Cleanup

  1. Pingback: The Joys of Restoring Vintage Tools | Make:
  2. Pingback: Make: Japan | ヴィンテージ工具をレストアする喜び

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