It describes the circular slide rule commonly know as an is-was used to calculate an approach and attack by an submarine.If you have access to an original of this document please contact us.We have added some photos of an original at the end of the manual.In 2007 some submarine gamesimulation folks created very nice replicas for their own use.
![]() With the authors permission, here are the files you can use make your own replica Attack Course Finder for non-profit purposes: attackfinder-color.pdf. Please report any typos, or particularly annoying layout issues to the Mail Feedback Form for correction. Revised Sheets 4, 5 6, revision letter E and reproduced them under letter F see revision no. Plate I - Diagram of Course Problem Plate II - Diagram of Speed Problem Plate III - Setting of Instrument for Course Problem Plate IV - Setting of Instrument for Speed Problem Plate V - Photograph of Course Finder Neg. Plate VI - Photograph of Speed Omnimeter Neg. Plate VII - General Arrangement Drawing 95060. The device on the obverse side is a form of the well known Is-Was, or submarine attack course finder devised by Captain Nasmith, Commander, R.N. Ftl unlimited power modThat on the reverse side is a form of circular slide rule or speed omnimeter arranged to solve for enemy speed with data secured during the approach. The basic principle involved is that a submarine or any vessel desiring. ![]() After the intercepting submarine has been steaming an appreciable time. If the other vessel has drawn abaft the beam, intercepting is assured unless it should alter course or speed, and it may be hastened by altering the submarines course gradually toward the other vessel until the bearing of the latter is held constant. If the other vessel has drawn ahead, actual intercepting by the. An experienced submarine commander noting the rate of change of bearing, the angle on the bow. C - Enemy Card (top disc) represents enemy ship, for reading relative bearing on enemy bow and track angle. Periscope pointers (placed between B and C) represents line of sight, for reading bearings and courses. An outline of the enemy is engraved on this disc to facilitate the operation by presenting a visual picture of the relative bearings. When the compass rose is set to own compass course and the pointer marked. Periscope is set to the bearing of the enemy, as obtained by the Periscope, the pointer at the opposite end will indicate on the rose compass the compass bearing of the enemy. The line joining these two pointers represents the line of sight. ![]() Angle On Bow Calculator Series Of TransverseOn the rear end of the periscope pointer, along its centerline, are a series of transverse marks spaced apart a distance equal to the side of a square, ( Note: On Submarine Attack Course Finders Mark I Mod. Dellorto sha carburetor manualNos. 301 to 306, these marks occur on both ends of the pointer). Any convenient number of hundreds or thousands of yards may be assigned to each division so that the initial range can be indicated on the periscope pointer by stepping out from the center of the device the requisite number of divisions.
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