26 
Formula for finding Easter*—Canal Queries. 
The village is now a sort of central 
spot for pilgrimage to the whole of Bo¬ 
hemia ; tire cm ions flock hither from 
every quarter to explore the effects 
of this phenomenon. It is impossible 
to form a just idea of it without in¬ 
spection. 
To the Editor of ike Monthly Magazine . 
SIR, 
S a general formula for finding 
. Easter according to the Gregorian 
Calendar, seems to be rather a deside¬ 
ratum, I have sent the following for 
insertion in your widely-circulating 
Magazine, if you think your valuable 
pages have not been occupied too much 
with the subject already. 
I know that several eminent mathe¬ 
maticians, compared with whose ac¬ 
quirements, mine almost vanish into 
nothing, have either failed in the at¬ 
tempt to give a general formula for 
this purpose, or declined the task. I 
therefore delayed sending this till I 
had given it every examination I was 
capable of giving it; and I now present 
it to you, Sir, under the most positive 
conviction that it will give the time of 
Easter correctly, for all years, accord¬ 
ing to the English regulations. 
Evesham , April 12th. J. Tovey. 
To find the time o f Easter for any year 
according to the Gregorian Calendar. 
Put a = the given year. 
c = the centuries contained in it. 
d = the odd years, or two right-hand 
figures. 
1. Divide c by 4, and call the quotient 
q, and the remainder r. , 
2. Divide (43 q -j- 17 r -J- 86) by 25, and 
call the quotient p. 
3. Divide (a + 1) by 19, and call the 
remainder g. 
4. Divide (203 -j- p — 11 g) by 30, and 
if the remainder be less than 28, or if it be 
28, and g be less than 12, call it m : but if 
it be 28, and g be more than 11, or if it be 
29, let g be what it may, then (remainder 
— 1) call m. 
5. Divide ( 151 -f- 2 r — d — \d — m ) 
by 7, and call the remainder n. 
Then (m -|- n — 9) is the day of April 
on which Easter falls ; but if (m -f- n) be 
less than 10, then (22 -j- m -j- n) gives the 
day of March for the year required. 
For the Monthly Magazine. 
CANAL QUERIES, with ascertained 
LEVELS of various CANALS. 
HAT is the level of the sill of 
the lock of the Grand Junction 
Canal at Brentford (in reference to the 
summit at Tring) instead of the present 
[Aug. 1, 
reference to the high water mark in the 
Thames ? 
2. The difference of level between 
the Duke of Bridgewater’s Canal, and 
the Leeds and Liverpool Canal, a branch 
canal having lately been executed, 
which connects these two canals toge¬ 
ther ? 
3. The rise of the Thames from the 
sill of the lock at Brentford, to the 
river Kennet, near Reading, and from 
thence to the sill of the lock of the 
Kennet and Avon Canal at Newbury ? 
4. The rise of the Severn from Stour - 
port to the canal at Shrewsbury ? 
5. The difference of level between the 
Lancaster and the Leeds and Liverpool 
Canals, where they intercut each other ? 
6. The fall of the river Aire, from 
Leeds to the Lea? 
7. The fall of the Thames, from 
Brentford to the sea ? 
S. The fall of the Severn, from the 
sill of the Canal lock at Worcester, to 
the Avon at Tewkesbury, tlieuce to 
Gloucester, and from Gloucester to the 
sea ? 
9. The fall of the Bristol Avon from 
the Kennet and Avon Canal lock, at 
Bath, to Bristol Bridge, and thence to 
the Severn ? 
10. The fall of the river Kew (where 
it joins a branch of the Grand Junction 
Canal at Northampton; to Peterboro", 
and thence to the sea ? 
11. The fall of the Trent, from the 
sill of the last lock upon the Grand 
Trunk Canal to the Chesterfield Canal, 
and from (hence to the Humber, where 
the Humber and Trent unite ? 
12. The fall of the Stratford Avon, 
from the sill of the Stratford Canal lock, 
to its junction with the Severn, at 
Tewkesbury. 
13. If in the reply to the 6th. 7th> 
8th, 9th,'10th, and 11 tli enquiries, a re¬ 
ference were made to fixed points, con¬ 
tiguous to those estimated to be the 
high and low water marks, it would 
afford as great an approximation to ac¬ 
curacy as circumstances will admit; 
and probably a barometrical admea¬ 
surement, conducted with all the proper 
precautions, may be the most easily 
adopted in most of these ca^es. If ob¬ 
servations were made with Sir Henry 
Englefield’sbarometer. at various situ¬ 
ations on different canals, viz. on March 
31st, June 30th, Sept. 30th, and Dee. 
31st, and at the same time, would not 
they afford some confirmation of Canal 
surveys, or lead to some further inves¬ 
tigation ? 
Levels 
