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Imperial Japanese Navy Torpedo Director
Binoculars
Binocular History Society
Tucson, 2013
Richard Lane
Taisho-Era (1915-1926)
Showa-Era (1926-1945)
Overview
Photo: © R. Lane
Taisho-Era Directors
5-15 variable power telescopes based
on British Royal Navy Torpedo
Directors (1909/1911)
4th-Year Torpedo Director (1915)
8th-Year Torpedo Director (1919)
14th-Year Torpedo Director (1925)
(non-optical-used in small craft)
Japanese Torpedo Fire Control – US Naval
Technical Mission to Japan – 18 Feb 46
Location of Target: Nippon
Optical Company
The bulk of the information in this
report was obtained from notes
prepared by Mr. Fuketa, designing
engineer for Nippon Optical
Company, which was the
manufacturing agent for most of
this equipment.
Showa-Era Directors
12cm Binocular
Used in Conjunction with
Rangefinders and Computers
Separate from Torpedo Tubes
Developed for Night Use
Showa-Era
Type 89 – 12cm Periscope Binoculars
Type 90 – 6cm Binoculars
Type 91 – 8cm & 12cm Binoculars
Type 92 – 15cm Binoculars
Type 97 – 12cm Binoculars
Type 0 – 15cm Binoculars
Type 1 – 18cm Binoculars
Photo: © R. Lane
Type 89 Director (Takao Bridge)
12cm
15x 4º
Type 91 Director (Cruisers and Destroyers)
8cm
15x 4º
12cm
15x 4º
Photos: © R. Lane
Type 91 Director – 8cm Binoculars
Photos: © R. Lane
Type 91 Director – 8cm Binoculars cont.
15 Power
4º
5.3 mm
Exit Pupil
Photo: © R. Lane
Type 91 Director – 8cm Binoculars cont.
Photo: © R. Lane
Type 91 Director – 8cm Binoculars cont.
Photo: © R. Lane
Type 91 Director – 8cm Binoculars cont.
Radium Quick
Sight
Photo: © R. Lane
Type 91 Director – 8cm Binoculars cont.
Red IR filter
Photo: © R. Lane
Type 91 Director – 8cm Binoculars cont.
Inspection
Stamps –
Objective
Housing
Photo: © R. Lane
8cm Binoculars – Data Plate
Photo: © R. Lane
8cm Binoculars – Data Plate Translation
January 1935
Type 91 Torpedo Director Model 2
Serial Number 43
Nippon Kogaku k.k.
Photo: © R. Lane
Type 91 Director – 12cm Binoculars
12cm Binocular
Photo: © R. Lane
Type 91 Director – 12cm Binoculars
12cm Binocular
15 Power
4º
8mm Exit
Pupil
Photo: © R. Lane
Type 91 Director
12cm Binocular
12cm Binocular
12cm Binoculars – Data Plate
Photo: © R. Lane
12cm Binoculars – Data Plate Translation
12cm Binocular Telescope
For Torpedo Director
Serial Number 158
Nippon Kogaku k.k.
Jan 1933
Torpedo
Right (Starboard) Photo: © R. Lane
Type 0 Director (Cruisers and Destroyers)
Photos: © R. Lane
Type 0 Director – 15cm Binoculars
Photo: © R. Lane
Type 0 Director – 15cm Binoculars
8mm Exit
Pupil
18.8 Power
3º
Photo: © R. Lane
Type 0 Director
Type 0 Director
15cm Binoculars – Data Plate
Photo: © R. Lane
15cm Binocular Telescope
For Type 0 Director
Serial Number 399
Weight 29 Kilograms Nov 1944 Nippon Kogaku k.k.
Torpedo
15cm Binoculars – Data Plate Translation
Photo: © R. Lane
15cm Binoculars – Destroyer Yukikaze
Type 0 - 15cm Binoculars – Destroyer Hasu
Photo: Courtesy
David Wright
Type 0 - 15cm Binoculars – Destroyer Hasu
1
2
3
Photo: Courtesy
David Wright
Type 0 - 15cm Binoculars – Destroyer Hasu
Night – Quick Sight
Reticle Attachment
Photo: Courtesy
David Wright
18cm Binoculars (Lookout)
© Joseph E. Low
Type 1 Director – 18cm Binoculars (Cruisers)
18cm Binocular
22.5/30 Power
2.6º/2.0º
22.5 Power
8mm Exit Pupil
Sources
18cm Binocular Drawing, © Joseph E. Low
Destroyer Hasu Photo, David Wright
Japanese Torpedo Fire Control, US Naval
Technical Mission to Japan, 18 Feb 46
Japanese Destroyers, Grand Prix Shuppan, 1995
History of Japanese Destroyers, Ships of the
World, 1992
Japanese Cruisers, Grand Prix Shuppan, 1993
Ships of the World, Volume 253
Nippon Kogaku, 75th Year History
Questions?
Photo: © R. Lane
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