Revised Technique of Photographic Data Acquisition

Abstract

A previously reported photographic recording device has been modified to accommodate available equipment and conditions. A battery operated system for tripping the shutter of an automatic advance camera, instead of a mechanical linkage, was developed to obtain daily data from a remotely located anemometer. The system includes a rotating drum recorder with an 8-day clock, a 24-volt DC battery power pack, solenoid plunger, capacitor, and microswitch. Cautionary procedures are described for effective operation of the system. A periscope with magnifying lenses was used to locate the camera enclosure and operating mechanism below the plane of the anemometer cups to minimize their effect on the air flow near the instrument. Specific length dimensions of the periscope to provide clear, readable images of the film negative are presented.