I completed the spreadsheet, giving up the Investigation>Research specialisation to spend all 15 experience points on a Talent (Iron Will). I transcribed the new values on the GP character sheet.
As far as Inventions go, his lack of funds probably didn't allow him to build anything too complex or massive. I imagine him travelling with small proof-of-concept prototypes (a part of the mechanism, or a scaled down version) and a portfolio of many blueprints.
The inventions that he is seeking backing for (and intends to patent), could be:
1. A new hydraulic lever system capable to multiply an input force many times, outputting much more power. As a prototype, Nathaniel built a mechanical harness that goes around the wearer's forearm and is controlled by a glove, connected to a mechanical claw for lifting heavy weights (the Cranstone Gauntlet)
2. A sound wrecking device, turning sound waves into powerful vibrations capable of cracking stone, applicable in demolitions and in the mining industry.
3. A portable dynamo generator charging with the movements of the human limbs. Even walking and everyday motions are sufficient to produce electricity. The energy produced is stored in a special battery that Nathaniel uses to power some of his other portable inventions.
4. A night vision lens using electricity to stimulate an emulsion with high photosensitivity. The emulsion "draws" shapes in dim vision on the lens emulsion, like a camera film, but is fast reacting, resulting in a monitor of sorts that refreshes almost in real time allowing to examine details invisible to the naked eye.
