Fig. 14
From: Development and assessment of a hand assist device: GRIPIT
Experimental results for Task 6. a Contact angle variation while drawing with a conventional penholder (C), hand drawing (H), and drawing with GRIPIT (G); small contact angle variation means pen doesn’t shake a lot while writing. b Ratio between pen tip force and contact angle during drawing with a conventional penholder (C), hand drawing (H), and drawing with GRIPIT (G); Large force/contact angle ratio means pen doesn’t shake a lot even high force is applied on the pen. . * means there are significant differences between two values using a t-test. (p < 0.05)