Dangos 2 canlyniad

Royal Dublin Society publicity leaflet, giving notification of a lecture to be given by Fr Henry Gill SJ at the next meeting of the Society on ‘The Effect of a Low Potential Electric Current on Photographic Plates’.

Leaflet published by the Royal Dublin Society entitled ‘Syllabus of a Course of Six Afternoon Lectures adapted to a Juvenile Auditory’. Two of the lectures on ‘Electric Sparks: Their Use in Wireless Telegraphy’ are by Fr Henry Gill SJ.