Description of an efficacious Temporary Rudder. 419 
Time. Hygrom. Therm: Electrom. 
June 4th, 9 30 A.M. 32 56 © divergence 1-25 inch 
June Sth, 3S 30 P.M. 30 53 1-1 
8 — 29154 idem 
10 — 24 80 = divergence 1°5 
Potash removed. 
June 6th. 11 0 A.M. 35 53 idem 
June 7th. O QO — _ a moistened card placed in receiver, 
June Sth. 11 30 A.M. 40 50 divergence 1:25 inch 
20 — 40 61 1°5 
3.30 — 37477 © struck 1 per minute 
345 — 374 80 3 
445 — 39 76 2-5 
545 — 40 71 5 
June 9th, 9 another moistened card placed in receiver, 
June 10th. 6 O P.M. 42 60 divergence 1°25 inch 
640 — 40 69 1:5 
650 — 39573 © struck 2 per minute 
725 — 39 77 3 
8 0 — 39% 80 45 
‘There are several circumstances deserving observation in these 
experiments, but one in particular; viz. that on the 5th of June, 
when the air had been dried- by a long continued action of the 
alkali, the power of the column was not increased by a rise of 
temperature im its usual degree. Possibly the disks of paper 
had been also deprived of a part of the moisture which eepse 
necessary to the action of the column. 
XC. Description of an efficacious Temporary Rudder. 
By Captain Joun Peat, of Bloomsbury Square*. 
Sir,— I BEG to submit, through you, for the consideration. of 
the Society for the Encouragement of Arts, Manufactures, and 
Commerce, a sketch of a temporary rudder, invented and used 
by me on board of the ship Cornwall under my command, -on 
my voyage from this country to Jamaica, in January 18115 
which ship was engaged by the Transport Board for the con- 
veyance of 14 officers, 200 privates, 7 women, and 4 children, 
to Barbadoes. 
In lat. 44° 0 long. 19° 30’ on my passage out, I encountered 
a very severe gale of wind with a heavy sea, which carried away 
my rudder, and the rudder braces on the stern-post: I was, 
* From Transactions of the Society for the Encouragement of Arts, &c. for 
1813.— The gold medal of the Society was voted to Capt. Peat for this 
useful i invention. 
Dd2 therefore, 
