PS Magazine - APRIL 1973
PS, The Preventative Maintenance Monthly
1973 SERIES, ISSUE 245
APRIL 1973
Does your M2 magnetic compass have
you lost?
If any of tHese things is wrong, your
compass is unserViceable. Turn it in and
get a new one± It comes with case as FSN
1290-560²6596±
THe
case aLone is FSN
1290³654´5048µ
CHeck it oUt tHis easy way±
CO¶ER
AND
MIRROR·F¸iction
of
Hinge mUst hoL¹ cover in any ºposition
f¸om close¹ to 180° open± Blemishes on
tHe mi¸¸o¸ sucH as discoLo¸ations, stains,
smears o¸ smu¹ges, shalL not be La¸ge¸
tHan 1/16 incH an¹ there sHaLL not be
»¼GNE½¾C N¿EÀÁ¿ÂWÃtÄ neeÅLe LÃÆtÇ
ÃnÈ (LocKÃÉÈ) pÃÉ ÅeP¸eÊÊe¹ Êo en¹ is
ÆLËÊÄ ÌÃtÄ comPasÊ ÍoÅy, ÈeÉtLy sÄaKe
coÎPaÊs± NeeÅLe mUsÏ Ìo¸k ¸iÈÄt ÌÄen
coÎPaÊs ÃÊ ÌÃtÄÃÉ 3° of LeVeLÐ
12
ANÑÒE OF SIÑÓT ÒE¶EÒ ÒE¶ERÔ
MusÕ haVe enough friction Õo hol¹ the
eLevation scaLe index at any given setting
on tHe scale±
Á¿¶EÁSÂÖCi¸cULa¸ an¹ e×eVation±) ظoÙ
KeÉ, Ìon't wo¸k± ÚitÄ tÄe compass on a
P¸eVÃoÛLy
LeVeLe¹
sU¸ÆÜce,
tÄe
ci¸cULa¸
×ÝVeL ÍËÍÍLe mUst Íe insi¹e tHe ¸eÅ ci¸c×e
wÃtÄÃÉ tHe wùtH of tHe ci¸cLe LÃne±
±\
.
•
'
'
l
I
/
SIÑÓT AÒÞNEMENTßMove cover to an
angLe of about 60° ± Òàne uá front and
rear sights until theàr tàps touch± âow
move tip of ¸ear sight along the etched
line of the mirror± Màsaliãement betweeã
tip andäedged Làne åust not be more than
width of line to left or right±
Mæ9 CARRYINÑ çASEßSnap Íutton
does not secUre flap, loop missing, not
secured by riveès± If éEEêER
W
ëSÒIDE,
FSN
5ì40³75ìí5580,
does not p¸operly
hold case on beLt, requisition a new one±
AZ¾»îTÓ SCAÒE ADJîSTER·îsing
a sc¸ew¹¸iVe¸, ¸otate azimUtH scaLe a¹ï
jUste¸, fi¸st in one di¸ðction an¹ tHen in
tHe otHe¸± If scaLe moVes mo¸e than 800
miLs in eÃtHe¸ ¹i¸ection, tHe stops a¸e ¹eï
fectiVe± ScaLe mUst not Íin¹ o¸ Íe Õoo
Loose±
CLEANiNG PRECAUTiONS
Þn cold weather never breathe on the
gLass± This may eVen b¸eak tHe gLass±
You neve¸ u
ñ
se polishing liquids, pastòs
or ab¸asives for poLishing the window or
mi¸¸o¸± îse only clean Lens paper Õo get
the ¹Ust off±
Alcohol and Lens tissue wiLl heLp you
get finge¸prints, oil o¸ ó¸ease f¸om the
glass±
THe
compass
is seale¹
to protect it
against moistu¸e, dust an¹ Variations in
atmospHeric
conditions±
ÓoweVer,
it
wonôt ¸esist steam, air or wate¸ under
HigH pressu¸e±
HAnDLiNG H±ntS
YoU¸ M2 compass is not ¸uggediõe¹
eQuipment so if yoU tHUmp it a¸oUn¹ it
wonöt gÃVe yoU accu¸ate ¹i¸ections÷
If it gets wet, ¹¸y it comPLetely Íefo¸e
PuttÃng it in its case±
Neøe¸ tinke¸ wÃtH tHe sc¸eÌs±
In ext¸eme coL¹ ×eaVe it oUtsi¹e in a
sno̲tigÄt Locke¸ wHen yoU go into yoU¸
ÊHeLte¸±
If yoUù¸e in a ¹Usúû, san¹y a¸ea yoU
Hüe to Íe ext¸a ca¸efU× ÌHen yoU cLean
yoU¸
compass
soýs
not
Õo
Êc¸atcÄþ tHe
mø¸o¸±
THe ¹ope on oÿe¸ation is in TM 9í1290-
333Ā15 āNoV
63)²
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