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Abrams SC-1 Technical Manual
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Abrams SC-1 Technical Manual

Sun compass
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T
DEPARTMENT
TECHNICAL
MANUAL
R
u
COMPASS, SUN
UNIVERSAL TYPE,
MODEL
SC-1
TM
This
of
reprint
5-9422, Compass, Sun, Universal
is
a
No
will
Abrams,
Model
Type,
SC-1.
distribution
made
be
original
personnel
publication.
to
possessing
the
..
,
DEPARTMENT
NOVEMBER
1943
1

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Summary of Contents for Abrams SC-1

  • Page 1 DEPARTMENT TECHNICAL MANUAL COMPASS, SUN UNIVERSAL TYPE, MODEL SC-1 This reprint 5-9422, Compass, Sun, Universal will Abrams, Model Type, SC-1. distribution made original personnel publication. possessing DEPARTMENT NOVEMBER 1943...
  • Page 5 DEPARTMENT TECHNICAL MANUAL 5-9422 COMPASS, SUN UNIVERSAL TYPE, ABRAMS MODEL SC-1 DEPARTMENT NOVEMBER 1943 •...
  • Page 6 WAR DEPARTMENT, November Washington 1943 5-9422, Compass, Sun, Model Universal Type, Abrams SC-1, of all information published for the and guidance concerned. /A.G. 43)./ (1 Nov. 300.7 War: By order the Secretary MARSHALL, Chief of Staff. OFFICIAL: ULIO, Major General, The Adjutant General.

  • Page 7: Table Of Contents

    TABLE OF CONTENTS Title Page Introduction SECTION Description III. Installation Operation Inspection and Maintenance Reassembly Disassembly, Inspection, Repair, List Group Assembly Parts M558501...
  • Page 8 — FIGURE The Universal Sun Compass. Gimbal mounting Shadow bar Pivot bolt Level vial plate Protractor Gnomon Sighting Date bar Solar plate...

  • Page 9: Introduction

    DESCRIPTION INTRODUCTION SECTION INTRODUCTION This Instructions with parts manual Handbook list for Universal Sun Compass Model SC-1, direction land navigation. instrument This instructions Handbook contains descriptive data and installation, maintenance, and disassembly operation, and assembly of Sun Compass. List parts list ar...
  • Page 10 MAINTENANCE MANUAL the complement of, at night when not cloudy. star land navi not replace the magnetic compass. does with gator both, using the sun compass equipped must whenever possible, and reserving the magnetic compass cloudy periods. sun compass is attached the vehicle by means allows tip...
  • Page 11 DESCRIPTION with spare level provided instrument case each pass. breakage. — The protractor Protractor plate Plate. (item plate fastened to the gimbal mounting and marked round steel intervals numbered every ten degrees, one degree line arranged direction. read counter-clockwise to be protractor plate diameter...
  • Page 12 MAINTENANCE MANUAL plus sign, or minus, according to the indicated meridian) Each directly number obtain apparent or true sun time. lines are opposite the heavy line. opposite one end date lines which represent the date to which the correction values are obtained by adjustment applied.

  • Page 13: Installation

    INSTALLATION Bar. — straight, The shadow bar /. Shadow (item the pivot bar pivoted on the shadow bar bearing narrow determines where the shadow cast by the gnomon rod bolt. fall turned to the proper intersection time should when latitude lines solar plate.
  • Page 14 MAINTENANCE MANUAL turret tank, where the mounted outside the should when the hatch tank commander can observe open. in. strap iron, which can bracket % in. x made the vehicle, provides suit an appropriate place bolted able mount compass. that The compass must mounted 0-180 degree...
  • Page 15 INSTALLATION (7) Mark at point distance perpendiculur This the center line of the vehicle (line C-D). determines point A. string from point Stretch center to the the com (point pass string is directly Turn until over the compass CAUTIpN protractor. "0"...

  • Page 16: Operation

    MAINTENANCE MANUAL SECTION OPERATION TIME (Apparent Time). TIME WATCH CONVERTING — principle of General. Because operating the sun from pass determining direction the shadow cast based on the time must sun, and maintained piece used be set called apparent time, sun time.
  • Page 17 OPERATION That setting clocks at o'clock noon when o'clock is, by standard Sunrise and sunset can made to time. come "Daylight later This hour time may the clock. called Time", "Wartime", "Fast Time", is usually Saving during the summer months. adopted The first from...
  • Page 18 MAINTENANCE MANUAL this irregularity. get days equal length, order fictitious sun is assumed revolve around the earth mean uniform solar this Mean rate. time time based on mean real sun either ahead or behind the sun. mean this reason, mean solar few minutes.
  • Page 19 OPERATION This factor is expressed in minutes on date bar of sun. opposite the appropriate compass, date. Local Apparent Solar Time. Changing Mean Time (1) When the equation applied solar time mean our position, the local apparent time time result (true the position.
  • Page 20 The hour zoois top and the map are numbered bottom clarify irregular their position. The half zones to some hour tones within their boundaries. localities are numbered where...
  • Page 21 Time Zones. half neither hour or hour time is time which used, serves that locality is convenient space. standard given the nearest...
  • Page 22 MAINTENANCE MANUAL four from This minutes the local standard time. determines your solar time at position. the mean (5) Now from apply equation time taken the date will Examining the sun compass. the date bar disclose that opposite the date lines indicated on the bar are short, heavy lines which are numbers...
  • Page 23 OPERATION which (point to the the local meridian lies sest cl< longitude meridian. degree (b) The date on which the problem is Drked bein^ military authorities have and the time which vember 8, 1943, faster Wartime, furnished is A.M. hour 10:38 which for this...
  • Page 24 MAINTENANCE MANUAL (a) This information is sometimes given on the map and in that cluded in the figure representing direction, such as found from in the "Compass rose." an iso- can also obtained locality in chart gonic question. which includes The iso- gonic chart is...
  • Page 25 OPERATION Loosen the clamping nut underneath the sun compass terminating until turn the arrow-head date bar protractor mark line points to the on the direction degree followed. which represents the azimuth course to be providing it This from determined azimuth a map, arrow or projec...
  • Page 26 MAINTENANCE MANUAL traveling when traveling east and subtracted when west. of longitude is approximately degree miles at degrees latitude and approximately miles at the equator. (2) To Determine an Unknown Azimuth. it is desired know vehicle is what direction headed, solar plate is adjusted the proper date line date bar.
  • Page 27 OPERATION impossible to properly shadow bar which has been set. difficult reference points are to observe make foresights because and maintain. Sun Compass at Night. Using may also at night The sun deter compass be used Polaris, from Polaris (north star). Figure mining north shows —...
  • Page 28 MAINTENANCE MANUAL MAJOR URSA URSA MINOR Polaris CASSIOPEIA — FIOCRE Location of Polaris.

  • Page 29: Inspection And Maintenance

    INSPECTION MAINTENANCE P.M. (5) Using the Sun Compass A.M. after before during The sun compass can the hours be used light A.M. after P.M. however, necessary before mental change make o'clock positions beyond That numbers representing the hours the solar plate. the numbers should progress from P.M.
  • Page 30 MAINTENANCE MANUAL — careful star nut spring (item being to lose the (item 3) — successively, the pivot bolt, shadow bar washer remove, and shadow bar bearing (item shadow bar (item (item the solar plate (item and the date bar (item vial removed by unscrewing The level...

  • Page 31: Disassembly, Inspection, Repair, Reassembly

    DISASSEMBLY, INSPECTION, REPAIR, REASSEMBLY vial and casing vial is broken, replace the level level unit. assembly as ASSEMBLY. trunnion assembly (item Place the frame and with support (item 18), insert the hex-head bolts (item heads inside the frame, seating the heads cap-screw locks on the bolts and placing...

  • Page 32: Group Assembly Parts List

    MAINTENANCE MANUAL SPARE PARTS j»«r3ClP£sr.. f.fJ^e_ elsLUa. SIM* HI. T«: . aimu te.r «f P.O. Box 1679, Columbus, Ohio ..y.-ii^.-liit Oc.tobej-..19lf3 _^£ec..ial u«« lUMMtiM N«. York guff Car.p, TOJ?^-^-?-5e-^---^?E?..?.^7...P^^^-cer-«----?-^e Officer, FOR; U^th Englnogr Supply Pine Canpj "t/.r.i^D York .r.o^i:Tontt l«nnt froa "mail- TO"...
  • Page 33 LIST PARTS PREPARATION INSTRUCTIONS. REQUISITION — "TO." show the approving to which requisi Space office tion submitted. "PERIOD."— for which Show period the supplies are Space required. — Full "SHIP TO." shipping address to given. Where Space from former mail address different shipping address the...
  • Page 34 — FIOUBI Detailed View of Sun Compass...
  • Page 35 — FIGURE Case and Accessories...
  • Page 36 MAINTENANCE MANUAL LIST ASSEMBLY GROUP PARTS PART NOMENCLATURE ASSEMBLY COMPASS 43D1360 — Spring Clamping nut 43A1361 Nut — Clamping 43A1368 — Bolt Pivot 43A1367 Bearing — Shadow bar 43A1362 — Shadow 43A1404 — Washer Shadow bar 43A1363 — Plate Solar 43B1365 Bar—...
  • Page 37 LIST PARTS LIST PARTS PAUT NOMENCLATURE Heq'd — Lock, Cad. plated, Washer 43A1431 (com'l) — Flat, Washer Cad. plated, 43A1433 (com'l) — Wing plated, 43A1434 cad. %6-24NF2 (Com'l) Hex., Bolt— plated, H.D. %-24NF- cad. 43A1430 2x1% Igth (com'l) — Lock, Cad. plated Washer 43A1432 (com'l)