Michael Feldman, president of Feldman Land Surveyors, will give a presentation on his company’s use of three-dimensional laser scans of historic sites.  Feldman will share his company’s techniques while showing examples of recent work.  He will discuss how these renderings play a crucial role in modern renovations of historic sites.  The May 21st talk is sponsored by The Metropolitan Waterworks Museum and will begin at 7 pm at 2450 Beacon Street in Chestnut Hill.  $5 per person.  For more information contact Lauren Kaufmann at info@waterworksmuseum.org, or call 617-277-0065.