Instrument - Parallel Ruler Roller bearing parallel ruler C Media reuse Reuse this media Can you reuse this media without permission? Yes Conditions of use Public domain This media item is listed as being within the public domain. As such, this item may be used by anyone for any purpose. Attribution Please acknowledge the item’s source, creator and title (where known) © Digital reproduction copyright of QMM QMM Have a question? Contact Queenscliffe Maritime Museum Download Download image (jpeg) Physical description Roller bearing parallel ruler in timber case. Subjects navigation, drafting, instrument