Heat pump

Heat pump
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Why am I seeing a watermark?
Title: Heat pump

Caption: "Heat pump--One compact unit to heat homes in the winter and cool them in the summer is what these [two] mechanical engineering students are working on. By a flick of a switch heat can be drawn up from coils buried 10 feet in the earth. On warm days the operation is reversed and hear from the house is drawn into the ground coils;." sign on machinery: "Refrigerator contains 6 lbs. Freon 12."

Date: 1952
Location: Brooklyn (New York, N.Y.)
More Details: Grease pencil cropping marks; retouched.
On verso: caption stamped: Mar. 9, 1952; Brooklyn Eagle stamp; photographer's stamp.
Title from caption on verso.
Collection: Schools
Subject: Polytechnic Institute of Brooklyn.
College students
Engineering students
HVAC systems
Institution: Brooklyn Public Library, Brooklyn Collection.
Medium: Gelatin silver prints.
Photographic prints.
Rights: Copyright restrictions apply to the use of this image. For more information or to obtain a photographic reproduction of this image, contact the Brooklyn Collection at Brooklyn Public Library
ID: SCHL 0204