Second mate of yacht observing radiation thermometers on Mount Guajara before 1886

"Second Mate of Yacht Observing Radiation Thermometers on Mount Guajara" is a photograph by Charles Piazzi Smyth taken before 1886. The image shows three men, likely crew members from the astronomer's yacht, using scientific instruments to measure radiation. This snapshot captures the scientific endeavors of Smyth's expedition to Tenerife, Spain, and offers a glimpse into the pioneering work in astrophysics in the 19th century. The photograph's small size and the candid scene contribute to its intimate and historical appeal.