| 摘要 |
<p>Draughting aid runs straight on a guide stay and/or in a groove on a drawing board rail and can adjust at angles to rail or board as required. The aid (1) is in one piece and has a number of grooves and/or stays at different angle settings. The section of the stays or groove corresponds to that of the board guide stay/or groove/as appropriate. The grooves and/or fitted stays are at the most frequently used drawing angles at 15 degree spacing, typically at angles of 0,15,30,45,60 etc. The aid is designed as a two leg angle piece with the legs at right angles.</p> |
