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.