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Id

Time

Zones.

neither

the

hour or

half

hour time is

used, the

time which

serves

as

standard

for

that locality is

given

in

the nearest

convenient

space.

18

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Summary of Contents for SC-1

Page 1: ...ANUAL u COMPASS SUN UNIVERSAL TYPE MODEL SC 1 This is a reprint of TM 5 9422 Compass Sun Universal Type Abrams Model SC 1 No distribution will be made to personnel possessing the original publication...

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Page 5: ...WAR DEPARTMENT TECHNICAL MANUAL TM 5 9422 COMPASS SUN UNIVERSAL TYPE ABRAMS MODEL SC 1 WAR DEPARTMENT 1 NOVEMBER 1943...

Page 6: ...5 9422 Compass Sun Universal Type Abrams Model SC 1 is published for the information and guidance of all concerned A G 300 7 1 Nov 43 By order of the Secretary of War G C MARSHALL Chief of Staff OFFI...

Page 7: ...CONTENTS Title Page SECTION I Introduction 1 II Description 1 III Installation 5 IV Operation 8 Inspection and Maintenance 21 VI Disassembly Inspection Repair Reassembly 21 Group Assembly Parts List 2...

Page 8: ...FIGURE 1 The Universal Sun Compass Gimbal mounting Level vial Protractor plate Date bar Solar plate G Shadow bar 7 Pivot bolt 8 Gnomon rod 9 Sighting rod IV...

Page 9: ...formation on stand ard commercial parts Column 4 indicates the number of parts in a sub assembly and the number of sub assemblies in the main assembly When a part number is preceded by an aster isk th...

Page 10: ...tated a full 360 degrees over the surface of the solar plate to the proper time latitude setting The solar plate and the date bar are clamped at the desired settings by a star shaped clamping nut on t...

Page 11: ...e can be moved along the date bar The date bar has a center line terminating in an arrowhead by which the azimuth is set on the protractor In operation the arrow points true north if all settings on t...

Page 12: ...owever the equation of time factors do not vary more than a few seconds from year to year e Solar Plate The solar plate item 5 is an oval shaped plate mounted so that it will slide on the date bar It...

Page 13: ...has a radium tip for use at night It is shorter than the gnomon rod so that Polaris can be easily sighted in the higher latitudes i Sighting Rod foresights The sighting rod item 9 is used to obtain a...

Page 14: ...ass for any reason d A method of mounting and aligning the compass using a mounting bracket follows 1 Select a mounting position where the compass is readily accessible to the operator and where sunli...

Page 15: ...own out of line by any object 10 Insert the second bolt and tighten them both securely Kecheck the alignment CENTtft UNE OE D FIGURE 4 Mounting Diagram 11 After the compass is completely aligned mark...

Page 16: ...ng one hour of the 24 hour day Theoretically these zones should be of the same size and shape However referring to figure 6 we see that due to political division some zones have very irregular boundar...

Page 17: ...ge the local watch time to standard time Determine from military or civil sources tin time at which local clocks are set and adjust the watch used with the sun compass to standard time d Mean Solar Ti...

Page 18: ...points a and b may range from 11 30 o clock to 12 30 o clock e Changing from Standard to Mean Solar Time The next step in changing the time piece from local watch time to local apparent time sun time...

Page 19: ...ne of Time Conversion Process 1 Ascertain from military authorities that the timepiece to be used with the sun compass is keeping accurate time in ac cordance with the time adopted for use in this loc...

Page 20: ...he hour zoois are numbered at the top and bottom of the map and in some of the irregular zones to clarify their position The half hour tones are numbered within their boundaries At localities where 12...

Page 21: ...Id Time Zones neither the hour or half hour time is used the time which serves as standard for that locality is given in the nearest convenient space 18...

Page 22: ...minus sign These numbers are the equation of time factor and must be added or subtracted to the mean solar time ac cording to the sign in order to determine true sun time local apparent time There are...

Page 23: ...f the time meridian so our correction is 4 x 2 8 minutes This subtracted from 9 38 results in the time of 9 30 which is the mean solar time for our position 4 To complete the problem and find local ap...

Page 24: ...nts the date of the day 4 We can now find the apparent time sun time for the locality by determining the time line indicated by the inter section of the shadow cast by the center gnomon rod and the la...

Page 25: ...he date bar which represents today s date Both sides of the date bar are the same so that it does not matter which edge is used Clamp the date bar and solar plate in position by turning up on the clam...

Page 26: ...icle and the final destination should be taken as often as possible The vehicle should be stopped the compass leveled and a sight made on a distant object by aligning the object and the sighting rod s...

Page 27: ...are easily recognized during any clear night by an observer north of the tropics b Orienting the Vehicle to a Predetermined Azimuth 1 Screw the three inch radium tipped sighting rod into the hole pro...

Page 28: ...MAINTENANCE MANUAL URSA MAJOR Polaris I I I J URSA MINOR tv CASSIOPEIA FIOCRE 8 Location of Polaris 20...

Page 29: ...ovement and see that they can be securely clamped in a rigid position by turning up on the wing nuts o Check the level vial and the etched surfaces of the pro tractor date bar and solar plate for legi...

Page 30: ...tem 21 and slide the gimbal arm and bearing assembly out of the frame and trunnion assembly Unless the cap screw lock item 16 is damaged it need not be removed To disassemble the support assembly unsc...

Page 31: ...e in the frame and gimbal arm with the head inside the frame seating the head in the cap screw lock item 16 Then install the lock washer item 21 plain washer item 22 and screw on the wing nut item 23...

Page 32: ...i Tontt Pine Canpj New York l nnt froa mail TO I Robert E Hoe Major C 2 Engineer Property Officer rfi 3 ohn D Doe Colonel C E Executive Officer IIF it M AtTU I KK lull 111 I I VI HAM HRguiHKi Arrttuv...

Page 33: ...ce STOCK NO Show stock number listed in Federal Stock Catalogue Space ARTICLES Include sizes required Show purpose numbers applicable to an article or group immediately above the article or group conc...

Page 34: ...FIOUBI 9 Detailed View of Sun Compass 26...

Page 35: ...FIGURE 10 The Case and Accessories 27...

Page 36: ...Y 1 43A1375 Post Glmbal arm 43B1374 Base Gimbal arm 1 11 43A1369 BEARING BOSS ASSEMBLY 1 43A1379 Screw Bearing Boss 43A1380 Key Bearing boss 1 12 43A1387 LEVEL VIAL ASSEMBLY 2 43A1418 Vial Level 2 43A...

Page 37: ...psule 1 43A1382 Capsule Luminous 1 29 43A1376 Base Gnomon 1 43A1372 GNOMON ROD ASSEMBLY LONG 3 30 43A1381 Rod Gnomon long 8 28 43A1538 LUMINOUS CAPSULE ASSEMBLY 1 43A1377 Holder Capsule 3 43A1382 Caps...

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