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30 degs 45 degs 66 Farringdon Street A. V. Ballhatchet amateur Back-lining beginner cast iron centre line chamois leather clean colour compasses construction curves cylinder diagram diameter dimensions divided divisions draughtsman draughtsmanship drawing for reproduction drawing instruments drawn duction Dynamo edge employed enable end elevation example finished drawings free yd French curves handbook horizontal inch Indian ink inked lines inked tracings inked-in inking-in isometric projection joints large number Lathe latter length liquid inks locomotive machine marked material mechanical drawing metal method Micrometer Model Engineer model railway Motors nibs object ordinary paper pencil PERCIVAL MARSHALL perspective photograph plane post free iod practical Price 6d Prussian blue reader right-angles ruling pen scale screw screw-threads set-square Shading shown in fig Slide Gauges square straight line surface T-square thick thin tint tracings usually vertical lines Vulcanite Wireless workshop writer