Dr. Young's Remarks on the 
This sliding is seen very distinctly in the planks of the Albion 
and of the Belliqiieux, now at Chatham : at the same time there 
are also obvious indications of a certain degree of extension 
and compression : in the Albion, the butts of the planks have 
parted so far, that in some instances pieces have been let in 
between them : and in the Belliqueux, there is a space of about 
five inches between the middle of the deck transom and the 
Carling, which had originally been in contact with it. In the 
Asia, lately launched in the Medway, the arching amounted to 
three inches and a quarter, and the comparative length of the 
upper and lower parts was probably altered about two inches 
at most : the parting of the butts amounting to of an inch 
each “ for upwards of fifty feet in length in the midships, and 
for about eight feet from the top of the side," making a total 
extension of probably less than an inch : so that about half the 
effect seems to have been produced in one way, and half in the 
other ; but apparently the greater half by the want of stiffness. 
It is also usually observable, that there has been some degree 
of permanent compression or crippling below, the butts of the 
planks opening when the cause of arching has been removed, 
and the sheathing being more wrinkled than would have 
happened from the simple bending of the planks. Where it 
has been observed, that the fore part of all the treenails sup- 
ported the pressure of the planks in the after part of the ship, 
and the after part in the fore part of the ship, the observation 
must probably have been made on the lower parts of the ship, 
from the effect of a partial compression of this kind. 
