Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Inventor
Jonathan Rowland Dissanaike
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IndividualfiledCriticalIndividual
Application grantedgrantedCritical
Publication of GB190804575ApublicationCriticalpatent/GB190804575A/en
4575. Dissanaike, J. R. Feb. 29. Protractors; parallel rulers.-A circular protractor is divided into 360 degrees with a north and south line passing through the centre numbered left about, i.e. starting with zero from north left about to the same point, and with zero from south left about to the same point. There are rulers or straight edges B, b within the protractor, parallel to the north and south line, and a parallel ruler P is attached for the purpose of moving the same. Means are provided for raising the disk and ruler above the paper to facilitate movement of the protractor from one point to another.
GB190804575D1908-02-291908-02-29Combined Protractor and Parallel Ruler.
ExpiredGB190804575A
(en)