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Sept. 17, 1946. A. MEYER 2,407,893 NAVIGATOR 2 Sheets-Sheet l Filed Oct. 15,1943 .1 is» 60 V INVENTOR. Albert Meyer' ATTD RN EYE ‘Sept, 17, 1946. A. MEYER - 2,407,893 NAVIGATOR Filed Oct. 13, 1945 i 2 Sheets-Shea; 2 )INVENTOR. _ ‘ Albert-111515181’? BY - I ATTORNEYS Patented Sept. 17, 1946 2,407,893 UNITED STATES PATENT OFFICE 2,407,893 NAVIGATOR Albert Meyer, Albuquerque, N. Mex. Application October 13, 1943, Serial No. 506,111 2 Claims. 1 This invention has for its object the provision of a practical, compact, sturdy and durable navi gational calculating instrument for use in re stricted and con?ned areas such as the cockpit (Cl. 33—,-1) 2 A similar transparent disc 2 with correspond ing central circular hole for mounting upon in strument and immediately under disc I is gradu ated circumferentially at its outer edge from 0 of the ordinary plane. 5 to 100 and perpendicular lines are provided upon Another object of this invention is to provide its face longitudinally and transversely to form a calculating instrument that will readily solve blocks approximately one inch square. A disc any or all known navigation problems incident 4 of ?bre and of thickness sufficient to afford to cross country ?ying under all conditions of complete rigidity containing a circular central 10 opening for mounting below and under discs l travel. Another object of this invention is to provide and 2 is provided as a base upon which is to be a calculating instrument affording an erasable pasted or otherwise attached standard dimenl surface which can be used repeatedly for the sioned working air charts as found in common purpose of plotting any number of consecutive daily use. courses, bearings, etc., without detracting from 15 Discs l, 2 and 4 are secured together, 2 being its original usefulness. superimposed over 4 and I being placed above Another object of this invention is to elimi~ the others forming the top or plotting face of nate the use of a number of separate tools, in the instrument and all are secured together by struments, charts etc., by solving any and all means of stud 6 passing thru the central openings problems known to navigation with the use of of the discs from the bottom and loosely secured this compact, self-computing instrument, solely by thumb nut 5 at the top. Stud 6 is retained by its adaptation for use with standard Govern within the ?bre disc by means of contact with a ment charts as issued for this purpose. pre-inserted spring 1 within the section of the In the accompanying drawings, which form a ?bre disc 4 as shown in contact with milled groove part of this speci?cation the invention is illus 25 at the bottom end of stud. traded as follows: What is claimed is: Figure 1 is a top plan view of the assembled 1. In a navigation calculating instrument one invention showing the upper circular transparent transparent washable disc of pyralin or other discs superimposed over a standard, dimensioned suitable material graduated circumferentially to scale, navigation charts. 30 around its outer edge and having a circular hole Figure 2 is plan view of top disc of circular . or opening at its center for mounting upon its transparent material graduated circumferen~ companion disc, a companion disc of like trans tially along its outer edge. parent material arranged for mounting through a Figure 3 is a plan view of a circular disc of central opening below the upper disc and being. transparent material graduated circumferential 35 graduated circumferentially along its outer edge ly along its outer edge and etched with longi and having lines approximately 1 inch square tudinal and transverse lines spaced to form one etched upon its face, a disc of ?bre or other ma inch squares upon its surface. terial of the same circular dimensions as its Figure 4 is a plan view of a standard dimen companion transparent discs and having a cir sioned chart, or portion thereof as commonly 40 cular hole at its center containing a retaining accepted for air navigation purposes, mounted on spring for the purpose of holding and retaining a circular plate of ?bre or other suitable material. a central mounting stud upon which companion Figure 5 is a side elevation of the assembled _ transparent discs are mounted, a stud or bolt invention. retained in ?bre disc and extending thru central In the foregoing drawings l is a circular trans 45 openings of transparent super-imposed discs said parent disc of pyralin or other transparent ma discs being retained in position on stud by a terial having a somewhat roughened surface to thumb nut screwed to stud from top. facilitate legible plotting and drawing upon its 2. In a navigation calculating instrument, surface and lending itself to erasures thereon comprising two transparent graduated discs su either by an eraser or by wiping with a damp 50 perimposed upon a base disc of ?bre, a stud cloth. The disc is perforated at its exact center mounted centrally of said base disc, a spring for with a circular hole of any predetermined di retaining said stud in said base disc, and said mension to allow fastening to and upon the ?rst mentioned discs being retained thereon by lower sections of the instrument. The said disc said stud, a thumb nut secured loosely in con is graduated circumferentially along its outer 55 tact with the outer disc on the top of the stud, edge with equally dimensioned graduations from said base disc constructed for securing a section 0 to 36 representing a circle of 360°. Another of map thereto, the outer transparent disc rough circular graduation is etched on the face of the ened whereby it may be written upon and erased. disc just within and adjacent to the outer grad uation with indicating scales of temperature, air speed, etc. ALBERT MEYER.