The 1909 edition of the U.S. Navy's "International Code of Signals" was 552 pages long. It reviewed a variety of semaphore signalling methods, in particular the messages which could be sent by ships using signal flags -- a method which would be made largely obsolete by the development of radio. Below is a small sample of the thousands of visual signals recorded in this book.
 
International Code of Signals: American Edition, Hydrographic Office, U.S. Navy, 1909:
 
Pages 70-71 (Auxiliary Phrases):
 
 HE, SHE, IT, or, PERSONS, or, THINGS, Are, or, Is, etc.   (See Is.)
BTJ--Can, or, May he (she, it, or person-s or thing-s indicated)?
BTK--Can, or, May he (she, it, or person-s or thing-s indicated) be?
BTL--Can, or, May he (she, it, or person-s or thing-s indicated) have been?
BTM--Can not, or, May not he (she, it, or person-s or thing-s indicated) be?
BTN--Can not, or, May not he (she, it, or person-s or thing-s indicated) have been?
BTO--Could, or, Might he (she, it, or person-s or thing-s indicated) be?
BTP--Could, or, Might he (she, it or person-s or thing-s indicated) not be?
BTQ--Do, Does, or, Did he (she, it, or person-s or thing-s indicated)?
BTR--Do not let him (her, it, or person-s indicated) have.
 For him (his, her-s, it-s, or person-s or thing-s indicated) _ _ _ _ BPD
 From him (his, her-s, it-s, or person-s or thing-s indicated) _ _ _ _ BPO
BTS--Had, Has, or, Have, he (she, it, or person-s or thing-s indicated)?
BTU--Had, Has, or, Have, he (she, it, or person-s or thing-s indicated) been?
BTV--Had, Has, or, Have, he (she, it, or person-s or thing-s indicated) had?
BTW--Had, Has, or, Have, he (she, it, or person-s or thing-s indicated) not?
BTX--Had, Has, or, Have, he (she, it, or person-s or thing-s indicated) not been.
BTY--Had, Has, or, Have, he (she, it, or person-s or thing-s indicated) not had?
BTZ--He.
BUA--He, She, It (or person-s or thing-s indicated) can (or, may).
BUC--He, She, It (or person-s or thing-s indicated) can (or, may) be.
BUD--He, She, It (or person-s or thing-s indicated) can not (or, may not).
BUE--He, She, It (or person-s or thing-s indicated) can not (or, may not) be.
BUF--He, She, It (or person-s or thing-s indicated) could (or, might).
BUG--He, She, It (or person-s or thing-s indicated) could (or, might) not.
BUH--He, She, It (or person-s or thing-s indicated) does (do, or, did).
BUI--He, She, It (or person-s or thing-s indicated) does (do, or, did) not.
BUJ--He, She, It (or person-s or thing-s indicated) had (has, or, have).
BUK--He, She, It (or person-s or thing-s indicated) had (has, or, have) been.
BUL--He, She, It (or person-s or thing-s indicated) had (has, or, have) done (or, is, or, are doing).
BUM--He, She, It (or person-s or thing-s indicated) had (has, or, have) had.
BUN--He, She, It (or person-s or thing-s indicated) had (has, or, have) not.
BUO--He, She, It (or person-s or thing-s indicated) had (has, or, have) not been.
BUP--He, She, It (or person-s or thing-s indicated) had (has, or, have) not done (or, is, or, are not doing).
BUQ--He, She, It (or person-s or thing-s indicated) had (has, or, have) not had.
BUR--He, She, It (or person-s or thing-s indicated) is (or, are) for.
BUS--He, She, It (or person-s or thing-s indicated) is (or, are) from.
BUT--He, She, It (or person-s or thing-s indicated) is (or, are).
BUV--He, She, It (or person-s or thing-s indicated) is (or, are) able to.
BUW--He, She, It (or person-s or thing-s indicated) is (or, are) not.
BUX--He, She, It (or person-s or thing-s indicated) is (or, are) not able to.
 He, She, It (or person-s or thing-s indicated) may.   (See Can.)
 He, She, It (or person-s or thing-s indicated) might.   (See Could.)
BUY--He, She, It (or person-s or thing-s indicated) must.
BUZ--He, She, It (or person-s or thing-s indicated) must be.
BVA--He, She, It (or person-s or thing-s indicated) must not.
BVC--He, She, It (or person-s or thing-s indicated) must not be.
BVD--He, She, it (or person-s or thing-s indicated) ought to.
BVE--He, She, It (or person-s or thing-s indicated) ought not to.
BVF--He, She, It (or person-s or thing-s indicated) ought to be.
BVG--He, She, It (or person-s or thing-s indicated) ought not to be.
BVH--He, She, It (or person-s or thing-s indicated) shall (or, will).
BVI--He, She. It (or person-s or thing-s indicated) shall (or, will) be.
BVJ--He, She, It (or person-s or thing-s indicated) shall (or, will) not.
BVK--He, She, It (or person-s or thing-s indicated) shall (or, will) not be.
BVL--He, She, It (or person-s or thing-s indicated) should (or, would).
BVM--He, She, It (or person-s or thing-s indicated) should (or, would) be.
BVN--He, She, It (or person-s or thing-s indicated) should (or, would) do (or, be done).
BVO--He, She, It (or person-s or thing-s indicated) should (or, would) have.
BVP--He, She, It (or person-s or thing-s indicated) should (or, would) not.
BVQ--He, She, It (or person-s or thing-s indicated) should (or, would) not be.
BVR--He, She, It (or person-s or thing-s indicated) should (or, would) not do (or, be done).
BVS--He, She, It (or person-s or thing-s indicated) should (or, would) not have.
BVT--He, She, It (or person-s or thing-s indicated) was (or, were).
BVU--He, She, It (or person-s or thing-s indicated) was (or, were) not.
BVW--He, She, It (or person-s or thing-s indicated) was (or, were) to be.
BVX--He, She, It (or person-s or thing-s indicated) was (or, were) not to be.
 He, She, It (or person-s or thing-s indicated) will etc.    (See Shall.)
 He, She, It (or person-s or thing-s indicated) would etc.    (See Should.)

 
Page 134 (Geographic Signals):
 
EAST  COAST  UNITED  STATES.
AYLP
AYLS
AYLV
AYMB
AYME
AYMH
AYMK
AYMN
AYMQ
AYMT
AYMW
AYNC
 
AYNF
AYNI
AYNL
AYNO
AYNR
AYNU
AYNX
AYOD
AYOG
AYOJ
AYOM
AYOP
AYOQ
AYOS
AYOV
AYPB
AYPE
AYPH
AYPK
AYPN
AYPQ
AYPT
AYPW
AYPZ
AYQC
AYQF
 
AYQI
AYQL
AYQO
AYQR
AYQU
AYQX
AYRD
AYRG
AYRJ
AYRM
AYRP
AYRS
AYRV
AYSB
AYSE
AYSH
AYSK
AYSN
AYSQ
AYST
AYSW
AYSZ
AYTB
AYTC
AYTF
AYTI
AYTL
AYTO
AYTR
AYTU 		Medway R.
Ossabaw Sound.
Ogeechee R.
Hardwick.
Vernon R.
Warsaw Sound.
Wilmington.
SAVANNAH.b e f
Tybee. c
Oyster Beds.
Cockspur I.
F.Jackson.
 
SOUTH CAROLINA.
P. Royal.c
Martins Industry Lt. V.
Paris I.
Hilton Head I.
Beaufort. f
St. Helena Sound.
Combahee R.
Hunting I.
Pon-pon R.
Edisto R.
Stono Inlet.
Charleston Lt. V.
CHARLESTON.c f
F. Sumter.
Moultrieville.a c d
Ashley R.
Cooper R.
Wando R.
Rattlesnake Sh.
Bull B.
C. Romain.
Racoon cay.
Peedee R.
Georgetown.c
Columbia (Congaree R.)
 
NORTH CAROLINA.
C. Fear.a d
Bald Head Ch.
Frying-pan Shs. Lt. V.
Federal Pt.
Oak I.e d
Wilmington.c
Beaufort.c f
Morehead City.c
C. Lookout.a c d
Core Sound.c d
Ocracoke Inlet.a d
Neuse R.
New Berne.c
Goldsboro.
Raleigh.
Hayti.
Bay R.
Pamplico.
Bath.
Washington.c
Hatteras Inlet.a d
Diamond Shoal Lt.V.c f
C Hatteras.a c d f
Oregon Inlet.a d
Bodie I.a d
Albemarle Sound.
Plymouth.
Roanoke R.
Edenton.c 		AYTX
AYUD
AYUG
AYUJ
AYUM
 
AYUP
AYUS
AYUV
AYVB
AYVE
AYVH
AYVK
AYVN
AYVQ
AYVT
AYYW
AYVZ
AYWC
AYWF
 
AYWI
AYWL
AYWO
AYWR
AYWU
AYWX
AYXD
AYXG
AYXJ
AYXL
AYXM
AYXP
AYXS
AYXV
AYZB
AYZE
AYZH
AYZK
AYZN
AYZQ
AYZT
AYZW
AYZX
AZBD
AZBG
AZBJ
AZBM
AZBP
AZBS
AZBV
AZBY
AZCB
AZCE
 
AZCH
 
AZCK
 
AZCN
 
AZCQ
AZCT
AZDC
AZDF
AZDI
AZDL
AZDO
AZDR
AZDU 		Chowan R.
Elizabeth City.c
Dismal Swamp Canal.
Wade Pt.
North R.
 
VIRGINIA.
False C.a d
Chesapeake B.
C. Henry.a c d
Lynn Haven.
F. Monroe.c
Old Pt. Comfort.
Hampton Roads.
Craney I.
Elizabeth R.
NORFOLK.b c f
PORTSMOUTH.
Norfolk Navy Yard.
Chesapeake and Albe-
    marle Canal.
Nansemond R.
James R.
Petersburg.
NEWPORT NEWS.b c
Appomattox R.
City Pt.
Richmond.
Back R.
York R.
Yorktown.
West Pt. (York R.).
Delaware.
New Pt. Comfort.
Wolf Trap Shs.
Piankatank R.
Rappahannock R.
Windmill Pt.
Corrotoman R.
Fredericksburg
POTOMAC R.
Piney Pt.
Blakistone I.
St. Clement B.
Chaptico.
Leonardstown B.
Wicomico R.
Mathias Pt.
P. Tobacco R.
Upper Cedar Pt.
Maryland Pt.
Mt. Vernon.
F. Washington.
Alexandria.
 
WASHINGTON, D. C.b f
 
DISTRICT  OF  COLUMBIA.
 
UNITED STATES.
 
MARYLAND.
Patuxent R.
Jones Point.
BALTIMORE.b c
Thomas Pt.
Annapolis.c f
Severn R.
Magothy R.
Patapsco R. 		AZDX
AZED
AZEG
AZEJ
AZEM
AZEP
AZES
AZEV
AZEY
AZFB
AZFE
AZFH
AZFK
AZFN
AZFQ
AZFT
AZFW
AZGC
AZGF
AZGI
AZGL
AZGO
AZGP
AZGR
AZGU
AZGX
AZHD
AZHG
AZHJ
 
AZHM
AZHP
 
AZHQ
AZHS
AZHV
AZHY
AZIB
AZIE
AZIH
AZIK
AZIN
AZIQ
AZIT
AZIW
AZJC
AZJF
AZJI
AZJL
AZJO
 
AZJR
AZJU
AZJX
AZKD
AZKG
 
AZKJ
AZKM
AZKP
AZKS
AZKV
AZKY
AZLB
AZLE
AZLH
AZLK
AZLN
AZLQ
AZLT 		Havre de Grace.
Susquehanna R.
North East R.
Elk R.
French Town.
Sassafras R.
Chester R.
Kent I.
Tred Haven Creek.
Sharps I.
Choptank R.
Castle Haven.
Honga R.
Hooper Str.
Nanticoke R.
Monie B.
Manokin R.
Somers Cove.
Pocomoke R.
Tangier I.
Cherrystone Inlet.
C. Charles.a d
C. Charles Lt. V.
Machipongo Inlets.
Chincoteague Inlet.
Assateague.a d
Winter Quarter Sh. Lt. V.
Ocean City.a d
Fenwick I. Sh. Lt. V.
 
DELAWARE.
Five Fathom Bank Lt.
    V.
North-East End Lt. V.
C. Henlopen.a d f
Breakwater Hr.
Delaware Breakwater.a c
Lewes.a d
Brandywine Sh.
Fourteen-feet Bank.
Mispillion Creek.
Cross Ledge Sh.
Ship John Sh.
Bombay Hook.
Reedy I.c
Delaware City.
New Castle.
Christiana Creek.
Wilmington.
Marcus Hook.
 
PENNSYLVANIA.c
Chester.
Schuylkill.
League I.
PHILADELPHIA.b f
 
NEW JERSEY.
Trenton.
Bordentown.
Burlington.
Camden.
Gloucester.
Billingsport.
Penn Grove.
Salem.
Cohansey.
Maurice R.
C. MAY.a c d f
Hereford Inlet.a c d
a Signifies an International Signal Station; b a Time Signal Station; c a Weather, Tide, or Ice Signal Station; d a Life-Saving Station: e a Lloyd's Signal Station; f a Wireless Telegraph Station.