| Original caption: “Officer at periscope in control room of submarine.” Officer views targets through Type 2 daylight attack periscope. By 1927, Kollmorgen dominated the United States periscope field. At the Kollmorgen plant in Brooklyn, New York, the 1944 wartime production rate of United States Navy submarine periscopes peaked at 1 periscope per day. The typical United States Navy submarine periscope cost 10,000 dollars in the early 1940s. The Type 2 daylight attack periscope was introduced into the submarine fleet in 1942. The periscope’s long slim neck – 1.4 inches (35 millimeters) in diameter – with a very small head resulting in reduced wake made it attractive for use in submerged daylight attack operation. Kollmorgen added radar to periscopes in November 1944, combing glass optics with the new ST firing range radar. This enhanced nighttime torpedo attacks. Modified, the Type 2 remained in United States Navy service into the 1990s. | |
| Image Filename | wwii1651.jpg |
| Image Size | 906.85 KB |
| Image Dimensions | 2346 x 2910 |
| Photographer | |
| Photographer Title | United States Navy |
| Caption Author | Written or Adapted by Jason McDonald |
| Date Photographed | January 1, 1943 |
| Location | Pearl Harbor |
| City | Oahu |
| State or Province | Hawaii |
| Country | United States |
| Archive | National Archives and Records Administration |
| Record Number | NWDNS-80-G-11258 |
| Status | Caption ©2026 MFA Productions LLC Please Do Not Duplicate or Distribute Without Permission; Image in the Public Domain |
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