Paper, 'Concerning the magnetism of drills' by Mr Ballard Ballard's discourse concerning the polarity of iron and outlining different experiments involving drilling into iron. A cleaner copy is available at CLP/9ii/11. Subject: Magnetism Published in Philosophical Transactions as 'Concerning the magnetism of drills; by Mr. Ballard. Communicated by Dr. William Musgrave, fellow of the Colledge of Physicians and R. S'. Communicated by William Musgrave. [1698]