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58 LONG'S COURSE AND BEARING CORRECTOR ov Tae MaRINE REVIEW > OR SHIP'S co 00 S.dIHS UO Worryt Nove SSvaWop ane} FIG, The. Corrector is an instrument that should be in the hands of every man in the for'ard end. The device solves all problems of the compass mechanically; corrects the course of itself for variation and deviation, both from true to compass and from com- pass to true in the one operation. It indicates the amount and direction of the deviation. Naming the deviation is one of the most perplexing things for the beginner to get wise to. Use of the Corrector will make this all very plain. There are no end of things that can be performed on this device, and it recommends itself par- ticularly for the simple manner in which all problems can be worked on it. The operator can see every move he makes or is required to make. He cannot make a mistake because the device pictures the example. -- GENERAL RULE FOR THE USE OF CORRECTOR. Set the N-point of the red card (card marked 'Variation Compass" on Corrector--second circle) with refer- ence to the N-point of the black one (outside circle marked "True Com- pass" on Corrector), in the direction and by the amount of the variation; similarly, set the N-point of the green card (marked "Deviation or Ship's 1, Compass" on Corrector--inside card), with reference to the N-point of the o | 5 ne i ; SG > NOLS) J Ly Bw q 1029 Tes ts g 2 P > ko S$¥dWoa ane W- ALSO° TRue. RUE_COMPASS red one, in the direction and by the amount of the deviation; then any, one of the three courses--the true, COTrect magnetic, or compass course-- being given, revolve radial arm till its central edge is upon that course, when the other two are seen on the same edge. To illustrate: Supposing a ship was steering NW x N 4% N by cdin- pass; Var. 4° Wly, Dev. 10° Why; required the true and _ correct nfig- netic courses; set the. N-point of Fed card at 4° west of N-point of black card (true circle), and holding it there, set the green circle with its N-point 10° west from the N-point of red circle, and holding the two cir- cles with the left hand revolve the radial arm with fhe right hand till its central edge is directly over NW x N % N; then the corresponding di- visions in line on the same edge will be found to be: on the red card, NW % N, being the correct magnetic course; and NW on the card in black card, being the true course. Fig. 2 is a picture of the foregoing example. The cards are in colors to make them the more distinguishable, espe- cially in reading the coinciding points. The radial arm is transparent cellu- loid so that all divisions can readily be seen through it. The foregoing pictures do not do the Corrector jus- tice, for in reducing them from the original, shadows show as _ circumfer- Co ort ; | 4/0 Pe iy po Z FIG. 2.