Sel I ie ae 
REFRIGERATION AND REFRIGERATOR INSULATION ON BOARD SHIP. 169 
Paul consisted of mineral wool. The vessel was delayed, and in the hurry to get her into 
service they gave up the scheme of fitting the cork sheets around the deck beams as had 
been specified and instead erected a double course of spruce sheathing under the deck beams 
and filled the spaces between them with mineral wool. The vibration of the vessel in time 
reduced this mineral wool largely to powder, and it had to be removed and new insulation 
installed overhead. The sheet cork, however, on the walls and floors of the rooms was 
found to be in first-class condition, as I have said. 
“When we remember that there is bound to be more or less moisture getting into every 
cold storage room, not only from the goods carried but from the opening of the doors and 
the condensation of moisture which then enters, it is clear that any insulation to be perfect 
must be non-absorbent, and when we take a material which is in its natural state admittedly 
very absorbent, and attempt to reverse its natural qualities artificially, I do not believe that 
the results are likely to be satisfactory in the long run. A very good job may be done in the 
laboratory or on a small scale, but as the business increases and it becomes necessary to 
trust ordinary labor to handle such processes on a large scale, then is the time when trouble 
begins. 
“As I see it, then, we have this material possibly waterproof but probably not, almost 
certainly highly inflammable, since its backers do not touch upon that most important ques- 
tion, being according to their own figures more than 13 per cent less efficient than pure cork 
board at even thicknesses, and costing to install about the same price. I do not see what 
there is in this showing to interest a practical owner of either a vessel afloat or a cold-storage 
plant ashore.” 
Tue CHAIRMAN :—On behalf of the Society, I will extend the thanks of the Society to 
Mr. Massa for his instructive paper, which I am sure that the Society wishes me to do. 
We will now take up paper No. 13, entitled “The Resistance of Various Types of 
Barges in Shallow and Deep Water,” by Prof. H. C. Sadler, Member of Council. 
Professor Sadler presented the paper. 
