|Title:||Calculating or like scale|
|Link to the patent office:|
|US676740 (espacenet), US676740 (uspto)|
Letters Patent in the Kingdom of Italy, dated August 19, 1898, No. 49,015
The present invention relates to a triangular scale for drawing purposes which provides a means of graphically solving several geometrical problems of practical importance to engineers, architects, mathematicians, designers, students, and others.