. 
508 REPORT—1868. 
alone been used, tables similar to those described above (§ 14) not having at 
present been adapted to quarter-hour observations. 
33. The periods chosen are the same length as those used in the Ramsgate 
series, and the observations have been dealt with in every way similarly to 
those of Ramsgate already described. ‘The observations extend from Sep- 
tember 1857 to September 1858. The datum-line is 12 feet below the level 
of the sill of George’s Dock. 
34. The following are the values of A,, B,, &c. for Liverpool to first ap- 
proximation, to which point the analysis has at this time been completed :— 
8 K L M N O 
(y—n) (y)  (y-8e-3@) (y-2) (y-ge+3~) (y—20) 
A, +o'0198 —o'1806 —0'01 34 —0'0222 —0'c065 +o'106r 
B, +0°0463 +0°3380 +0°0186 —0°0237 —o'0488 —0'4206 
A, +3°1645 +0°8899 +0'3639 — 61277 —0'6508 +0°2528 
B, +0825 = 07690 — 04247, +-7°3394 = +7183, 01766 
A, +o'0062 +o'0164. —oO’ollt +0'0773 — 00095 +0'0084 
B, +0'0304 +0'0123 —o'0148 -0'0607 --o'0199 +0'0294 
A, 070515 -+-o°0130 +o'0189 —0'6502 —0'0500 — 070095 
B, —0'0400 +0:0199 +o0'0980 —0'0866 + 0'0342 +oo115 
A. —0°0045 +0'0033 +0'0188 +oro141 --o'001§ —O'OIl5 
B, +0'0085 —0'0014 +oro150 +o0'0120 +0'0128 —0'0073 
A, —0°0090 —o'0048 +0'0048 —0°0784 +0'0036 —0°0227 
B, —0'0066 +0'0054. +0'0126 +0°1497 070075 —o'0190 
le —0°0022 —o'coo6 —0'0047 +o0'0172 +070085 +0'0134 
B, —0°0027 —0'0058 +o0'0016 —0'0004. —0'0207 —0'O175 
A, 00002 —0°0045 —0'0778 —0°0503 +0'0113 —o'O122 
B, —0°0059 —0°003I -+-0'0607 — 0°01 42 0'0135 +o'0169 
A, 16°7192 16°7129 16°7189 16°7215 16°7198 16°7072 
Series calculated with these terms agree closely with the original sets of 
means, the greatest difference being only 0-073 of a foot. 
35. Professor Fuller having applied to W. Parkes, Esq., M. Inst. C.E., for 
a set of tide observations of any port in India, that gentleman has kindly 
placed at the disposal of, the Committee, for analysis, a series of personal tide 
observations taken at Bombay from January 29, 1867 to June 4, 1867. The 
heights were observed at successive intervals of ten minutes, and were taken 
under the superintendence of Mr. Ormiston, C.E. A few breaks of short 
duration in the observations have been supplied from a curve plotted for each 
day of interrupted observation. The datum-line is 72 feet below the level 
of the Town Hall datum. 
36. The observations were not used as they were given, but heights for 
each quarter hour, the heights for the fifteen and forty-five minutes past each 
hour being interpolated. Tables similar to those previously described (§ 14), 
but adapted for the reduction. of observations taken for every quarter hour, 
have been made for a period of 127 days. It is intended to extend these 
Tables to the same length as those adapted for the hourly observations, by 
the use of which it is expected that a much less laborious process will suffice 
for correcting the first approximations of A,, B,, &c. than that by the use of 
the second set of Tables ($ 15). (The observations of Liverpool may here- 
after be reduced by the aid of these proposed quarter-hour Tables should it 
appear probable that better results than those now being obtained from the 
hourly observations may be expected.) 
