TIDAL DATUM PLANES lia 
SEPARTMENT OF COMMERCE 
U. S. COAST AND GEODETIC SURVEY 
Form 248 
Ed. Muy, 1928 
TIDES : Comparison of Simultaneous Observations 
(A) Subordinate station abhy CAsehe A Onnrmy Lat, IS ad : yL Long. PBL £0.6 Be 
(B) Standard station. JN&hejpudtednn 2 eters a platen See gO ee Lorg. EZ ESNGE, 
hit of ps ee era ene ere Time Meridian: (A) ......-- [PLO TEN se (DB) nea VASA 
| Pes ae STATION. (B) STATION. © ae (Ajaik) st (Ay STATION. [| (B) STATTON. | (A)=(B) | 
| Year. - Tiine of— ee of— ‘Timo disference. Z Height of - es of [serie cone | 
11949 HW. | Ew. (Pay | Bw. ff TW. LW. HW. LW. uw. | LW. | | ae | 
Mo. DB. |} fours. Flours. ;  ifours, \ Hours. Tours. Ilours. Feet. Feet. in ae |i [deen baal 
ee, AY.0 | 4.6 | ff10 | 4.5 |! 0.0 | 0.0 | 17.3") 6.7 | 2b77 ANG | 4.4 -4.7 | 
jes fee 25, GOS 235 pe Ot OO 14 Je ee it IG NE Be, ag |=. 4v) 
_ DPE Ee ea er te ee ee ere eer ce 
ee: mia nif gO ae Nig if otae iil Pooh lee al 4a eee el gues en allman ow. 
ee 3.0.4 | 6.0 1 0,4 | Ee oe lS 14.6 | 5,9. | 19.0 |10.3 |-4.9¢ |-4,4 | 
| i2.o | 18.6 fy2.) 908.7 | 0.7 [0.1 47.3"! avi angi 59+! -4.5v)-4.7¥ 
| 4l 4.0 | 65 | 4.2 | 64 | -o.2 | o.: bis.4 | 6.6 [19.9 [1.2 |-9.5 [ae | 
| 24 119.2 |2.5 119.) | or | ot |igz.ev! 1.4-| 23.je| 6.2vii -4,5v|-4.39¥ 
| eS | at hg a1 | -0.2| 0.0 16.5 | 7,0 | 240 1104 | -4.5 | -4,4 | 
i. HisnOrl) 20,00) (5500) (98)! Volo | ones |Pi9.a “o.3+) "23.0%! 4.4" -4.3¥| -4,64 
Wiese Se 1 eel a6. lost ou Lewes [rGaalien (OSEAN 20.0 |10.6 |-4.4_ sa 
3.6 | 20.3 143.7 120.3 | -0,1 | 0.0 | 18.0¥|- 0.3”) 22,57) 4, 6r|| 4, 5! -4.94' 
De ee ee ee a ee ee 
—fia.2 | 20.9 liga 20.9 | 0.0) au0 | 19:07 ott 2zecl $00 abe oat 
rns Some | eee ne |e ot | beet es Wenig seadllc saul | Lepr get 125A | Sel | 456.2 |" 76.6) 93h | =3II5 | 
oe | ana | eat azote (ae ee 
Sums.-.2-- | eee | eee oe een | Pastels Woe MAE alls Cres eB eal eee ee eas | ee ASG aI Wad l 19.1.| 41-2 | 726.7) - 3361) 
| oon | ene a a Wisse | nat | ings | 3.97 |-445|-4.73 
Drea 2 TT Ws LW. SPS (Ge) ee area 
(GQ) ee eee oes aa =Mean difference in time of high and low water respectively. 
ees ae ee) le eee =Correction for difference in longitude. (Table on back of form.) 
(3)==________ } — = (1)+(2)=Mean difference in high and low water intervals, respectively. 
Feel. Feet. 
(4)-=..17.,.87_—Mean MTIW height at (A). (5) =... 44 =Mean HLW height at (A). 
(6)=.. 15.40 =Mean LIUW height-at (A). (7) =...-4424_=Mean LLW height at (A). 
(8)=...2.247 =(4)—(6)=2DM1Q at (A). (9) =..--2.&.O.=(5)—(7)=2DLQ at (A). 
lo:=. 1.6.64 = 1[(4)+(6)]=Mean IW height at (A). (11)=....3-8%..=}[(5)4+(7)]=Mcan LW height at (A). 
(12)=_12.29 =(10)—(11)=Mn at (A). (13)=..10.24 =3[(10)4+(1)]=MTL at (A). 
(4)=— tEt4=Mean HIMW difference. (15)=_ 4.59 .—Mean HLW difference. 
(16)= 4.45 =Mean LIIW difference. (17)=.= 4.73 ..=Mcan LLW difference. 
(US) st O01 =-(14)—(16)=2DIIQ difference. (19) =....0«23_.=(15)—(17)=2DLQ difference. 
(20) =.= 4.4 =-3[(14)-+(16)]=Mean ILW difference. (21)=.7. 4.6% =3[(15)+(17)]=Mean LW difference. 
(22)=....0+ 18 (20) —(21)=Mn difference. (23)= 24,53 —3[(20)4+(2LJ=MTL difference. 
(24) = 1.014 — (12) =1(12) —(22)]=Mn ratio. (25)=_1.004 —(g)--1(3)—(18)]=DIIQ ratio. 
(26)=_1-046 —/9)---{(9)—(19)]=DL.Q ratio. 
Results from comparison of Stations A and B. | LWT. | LWT. | MTV. Mn. DHQ. DL@. | 
Length of Sorica. ae Tlours. j Tours. | Feet. Feet. Feet. Feet. | 
| | 
Accepted values for standard station, from 17 ean 1924-1942 |. | 430 12.94] 0.99 | LSS | 
Diiferences and ratios: (3), (23), (24), (25), (26)--------------- é oie seth pete Tet rs 1 | Meee 4.53 | <J.014) <1.004 eeuee 
eat pee 9.77 | 13.12 | 0,99] 262] 
Mean LW on stafi at subordinate station=MTIL—}Mn Sigel tces 
eee Mean LLW on staff at subordinate station =MTL—3Mn—DLQ=______. USF feet. z - 
Computed by ....ScATS. Pall SG SOM. Verified bye ee cas 2 ie , a4 I 3, 19S. 
(Dste.) (Dats.) 
Fig. 55.—Form for comparison of simultaneous observations. 
