1、MIL-C-228A bb M 7997706 0123878 LI m r MIWZ28A 21 NOVEMBER 1952 SUP$SEDING JAN-C-228 19 Jane 1945 MILITARY SPECIFICATION CIRCLES, AZIMUTH; AND CIRCLES, BEARING This specification has been appro). (for Domestic Shipment). MILITARY JAN-P-105-Packaging +nd Packing for Overseas Shipment-Boxes, Wood, Cle
2、ated, Plywood. JA4N-P-106-Packaging and Packing for Overseas Shipment-Boxes, W o o d, Nailed. MIL-B-lM-Boxes, Wood, Wirebound (Overseas Type). MIL-A-140-Adhesive, Water-Resistant, Waterproof Barrier-Material. . MIL- Camouflage, Quick Drying. . 23370S62 MILP-6889-Primer ; Zinc Chromate, for MIL-L717
3、Pieces l Through Ei8 Are to Be Used. S2407-607129-Stowage Box Assembly and Details for Azimuth Circle and Bearing Circle. (Copies of specifications, standards, and drawings required by contractors in connection with specific pro- curement functions should be obtained from the procur- ing agency or a
4、s directed by the contracting officer.) . 3. REQUIREMENTS 3.1 Material. 3.1.1 Prisms, lenses, and mirrors shall be of high-grade optical glass, stable, nonhygro- scopic, and free from strain, striae, stones, or seeds which are visible in the field of view or which would impair optical performance. .
5、- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-22A bb m 777Ob 0323877 b bl.2 Waxes, sealing materials, and lubri- cants used on metal parts shall be such as not to cause corrosive action of the optical and me- chanical parts or support fungu
6、s or mite growth. 3.2 Azimuth circle and bearing circle rings. 3.2.1 The azimuth circle and bearing circle rings shall be made of bronze conforming to Specification MIL-M-16576. The rings shall be turned true to fit over the bezel of the 735 inch Navy standard compass. 3.2.2 The azimuth circle ring
7、shall be pro- vided with prisms, vanes, and mirrors, ked at the extremities of two diameters at right angles to each other, whereby direct azimuths of ter- restria objects and direct reflected azimuths of the sun may be observed and simultaneously read from the compass card. 3.2.3 The bearing circle
8、 ring shall be pro- vided with a sight vane and a pentagon prism and mount. 3.3 Front vane assembly.-he prism shall be mounted at zero (O) degree mark of the azimuth circle and bearing circle rings in order to reflect the compass card reading to the ob- servers eye. The prism shall also reflect the
9、image of the horizontal wire, which is located at the base of the prism box parallel to and in coincidence with the sight vane wire. The front sight vane shall be mounted on the prism box, hinged to fold toward the center of the circle, and fitted to stop at the vertical position. The black reflecti
10、ng mirror shall be mounted on the prism box hinged so as to fold toward and away from the center of the circle. The spirit level shall be mounted horizontally on the prism box toward the center of the ring perpendicular to the line of sight. 3.4 Rear vane.-!he rear sight vane shall be located at the
11、 180“ mark of the azimuth circle and the bearing circle rings, diametrically op- posite the front sight vane, hinged to fold to- ward the center of the circle and fitted to stop at the vertical position. . .3.5 Mirror.-The cylindrical plano-convex mirror shall be located at the 270“ mark of the azim
12、uth circle ring, silvered, copper plated, and painted with acid-resisting paint on the convex side to reflect the image of the sun on to the 90“ prism which is located diametrically opposite. 3.6 Prism lens and level.-The bracket and box located at the 90“ mark of the azimuth cir- cle ring shall con
13、tain a 90“ prism and lens so placed that the image of the sun, as reflected by the cylindrical plano-convex mirror, will form a narrow slit of light on the compass card. The spirit level shall be mounted horizontally on the prism box toward the center of the ring per- pendicular to the reflected lin
14、e of light. 3.7 Knobs.-Knobs shall be made of bronze conforming to Specification MILM-16576, and shall be located at the 45“ and 225“ marks of the azimuth circle ring and at the 90 and 270 marks of the bearing circle ring, for the pur- pose of lifting or moving the instrument in azimuth, 3.8 Graduat
15、ions.-The inner edge of the azimuth circle and bearing circle rings shall be beveled and graduated in degrees from zero (O) degree in a counterclockwise direction through 360 ; every fifth degree shall be accentuated and every tenth degree numbered ; the degree marks and numbers shall be filled with
16、 a permanent white opaque material. 3.9 A1inement.-All parts shall be so assem- bled that the zero (O) degree and 180“ gradua- tions and all sighting marks will lie in a plane which will be perpendicular to the plane of the bearing rings when the azimuth circle and bear- ing circle rings are level a
17、nd shown to be so by the spirit level. This condition shall be true for all angular settings of the vanes and mirrors. The line of sight through the sighting vanes, the reflected image from the dark mirror, and the reflected image of the zero (O) degree mark on the compass cord shall be in the same
18、plane when the instrument rings are level and check with the spirit level attached to the pentagon prism box. The image of the sun reflected from the curved mirror shall cast a well defined pen- cil of light on the zero (O) degree mark of the compass card when the azimuth circle ring is level and ch
19、ecks with the spirit level attached to the 90“ prism box. 3.10 Balance.-The completed azimuth cir- cle and bearing circle rings shall be balanced and fitted with spring clips to secure the instru- ments firmly against the bezel of the 7% inch 2 Provided by IHSNot for ResaleNo reproduction or network
20、ing permitted without license from IHS-,-,-MIL-C-22A 66 7777706 0323700 7 Number of circles in an inspection lot i Number Acceptance Rejection of circles number number in sample (defectives) (defectives) Navy standard compass or the ships course indicators to prevent damage or loss during gun fire.
21、3.11 Finish.-All exposed metal surfaces except knobs, screw heads, pins, and wire shall be given one coat of zinc chromate primer con- forming to Specification MIL-P-6889 and two coats of black enamel conforming to Specifka- tion MIL-E-5556. All other parts with the exception of mirrors and prisms s
22、hall be coated with clear lacquer conforming to Specification Mu;-Ir?178. Bearing surfaces shall be black nickeled or bronzed without bufig ; such sur- f aces shall be smooth and free from tool marks. Finishes of all metal parts shall be such as not to permit corrosive action of the optical or me- c
23、hanical parts. The completed instrument shall withstand the salt-spray test specified in 4.4.2 without showing harmful corrosion. 3.12 Moisture and water resistance.-The prism boxes and mirror shall be watertight under normal service conditions, tightly se- cured, and sealed as shown on Drawings S24
24、07- 607127 and S2407-60712. 3.13 Carrying case.-The carrying case shall conform to Drawing 52407-607129. 3.14 Nameplates. 3.14.1 Amy.-Nameplates shall be fur- nished as specied (see 6.1). 3.14.2 Nauy.-A suitable nonwarping, weather-resistant nameplate of plastic or metal shall be provided on the fro
25、nt surface of the carrying case and marked in accordance with Drawing S2407-533000. 3.15 Marking. 3.15.1 Amy.-The marking shall be as specified (see 6.1). 3.15.2 Nauy.-The top surf ace of the circles in the 270 to 360 quadrant shall be engraved with the following (the zeros to be replaced by mark nu
26、mber and model number) : U. S. NAVY (TYPE) CIRCLE MK O MOD OO (YEAR OF CONTRACT) The letter N shall be encircled by a large letter O. It shall be followed by the serial num- bers as furnished by the procuring activity and the year of the contract. The contractors name shall be engraved on the top su
27、rface of the circle in the 90 to 180“ quadrant. .- MifrG228A 3.16 W or km ans hi p .-The workmanship shall be of the highest quality. 4. SAMPLING, INSPECTION, AND TEST PROCEDURES 4.1 Inspection procedures.-For Naval purchases, the general inspection procedures shall be in accordance with General Spe
28、cXca- tions for Inspection of Material. 4.2 Sampling for lot acceptance. 4.2.1 Lot.-For purposes of sampling a lot shall consist of all azimuth circles or bearing circles of the same design, manufactured in accordance with the same approved drawings, and submitted for inspection at one time. 4.2.2 #
29、ampling for and the fact that the Government may have formulated, furnished, or in any way supplied the said drawings, specikations, or other data is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or corporation, or conveying any rights or pe
30、rmission to manufacture, use, or sell any patented invention that may in any way be related thereto. Custodians : Army-Transportation Corps Navy-Bureau of Ships Air Force Other interest: ArmySig Navy-S. 5 U. I. OOYERHYENT PRIHTIO OFFICII lBSZ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
