21 cirkel. Dette gjordes en enkelt Gang (i 1877) ved Hjafip af Kompassets Pejlapparat, men .i Regelen (i 1878) paa nedenfor beskrevne Maade, Da enhver Pejlings Nojagtighed vsesentligst beror paa, at Kompasnaalen er i Ro og rigtig indstillet i den devie- rende magnetiske Meridian, og da Naalen let kan bringes i Svingninger ved Manipulationen af Pejlapparatet, naar dette er anbragt direkte paa Kompasdaasen, anvendtes til Pejlinger Wille’s Azimuth Pejlskive, et' Instrument, som jeg konstruerede i 1869 og som siden bar vrnret reglementeret i den norske Marine. Instrumentet er fremstillet i lios- staaende Figur, og vil lettelig forstaaes af Tegningen. the sun. On one occasion (1877) this was done by means of the sight vanes on the standard compass', but subse- quently without exception in the manner described below. As the accuracy of every bearing is mainly dependent, upon the compass-needle being steady, and parallel to the deviating magnetic meridian, and as the needle will be easily caused to vibrate when manipulating the bearing apparatus, if the latter be fixed direct to the compass-box, — all bearings were taken with Wille’s Azimuth Dumb- card, an instrument devised by the author in 1869, and which has since been officially adopted for the Norwegian Navy. The instrument is represented in the Figure. Paa Grund af Bevsegeligheden om Tapperne b og c vil Kuglen d, der er af Bly, altid liolde Tappen a vertikal, og Bingen f, der med sit Centerstykke kan drejes om den ovre Del af Tappen a, vil saaledes indtage en horizontal Stilling og bibeholde denne under' Skibets Bevsegelser. Bingen er inddelt i 360° og er tillige maerket med de 8 Hovedstreger N, NO, 0, SO o. s. v. Til Overka'nt af Tappen a er fastskruet .Tverstykket g, paa hvilket er an- The ball d, which is of lead, moving readily on the pivots b and c, will always keep the pivot a perpen- dicular; and the ring f, which along with its centre-piece can be made to revolve about the upper part of the pivot a, will accordingly take a horizontal position and keep it during the motion of the vessel. The ring is divided into 360 degrees, with separate marks for the 8 cardinal points, N., NE., E., SE., &c. To the upper edge of the pivot a is

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