Crown Adjustable Square

This is the perfect answer for anyone who naturally mistrusts the accuracy of their try square, an adjustable square. There are two screws in the base of the stock for making the adjustment, just unscrew one of them by, say, half a turn and tighten up the other one by a similar amount and the job is done. You can either check it against a known reference square or use the time-honoured method of marking a line square to the edge of a flat surface and then reversing the square to check that the two lines coincide. The square is very nicely presented with a brass blade, rosewood stock faced with heavy brass strips and brass inserts to cover the pivot pin and adjusting mechanism. Overall length is 145mm.