. 1816.) Scientific Intelligence. 241 
principles on which a successful fishery depends :—comprising, 
likewise, an account of the construction of a ship which seems best 
adapted for this trade, the mede of its equipment, with a statement 
of expenses, and a description of the boats, instruments, and ap- 
paratus, of the most improved principles with which it is furnished; 
together with a view of the modern method of discovering and 
attaining the haunts of the whale, effecting its capture under every 
variety of circumstance; and, a selection of anecdotes illustrative 
of the dangers of this occupation, and of the singular accidents 
which sometimes occur. 
VI. The history of the minor fisheries :—for seals, walruses, &c. : 
—with the method of killing these and other animals, inhabitants 
of the Greenland seas. 
VII. A journal of a Greenland whale fishing voyage. 
VIII. Appendix; containing, an extensive series of meteoro- 
logical tables, from which are deduced some important facts, rela- 
tive to the temperature and pressure of the atmosphere, prevailing 
winds, &c. :—interesting tables of meteorological results :—tables 
of the variation of the compass, latitudes, and longitudes, &c. 
from original observations. 
Greenland captains, or other gentlemen, who have met with 
remarkable adventures in the whale fisheries; or who, from research 
or observation, may be able to supply information calculated to add 
to the interest of this work, will, by sending an account thereof to 
the author at Whitby, confer a particular obligation on him. 
XII. Heat from Friction. 5 
Though the ascent and descent at Blackfriars bridge be very incon- 
siderable, it is always customary to fix a drag upon one of the wheels 
of the heavy waggons when they crossit. One day towards the end 
of January, as L happened to cross this bridge, I met five or six 
waggons all heavily loaded, and a wheel of each as usual fixed b 
the drag chain. ‘The day before had been rainy, and the bridge 
had that forenoon been swept by the scavengers; the pavement, 
however, was still very wet, though not covered with deep mud. 
The drag wheel of the first waggon that I met left the tops of the 
the stones dry, and a train of smoke rose after it nearly as strong ae 
rises from boiling water, so that it was visible at a considerable dis- 
tance ; this was also the case with the drag wheel of all the other 
waggons, the smoke was so conspicuous that it drew the attention of 
a boy who acted as drayman to one of the waggons ; for 1 observed 
him following the drag wheel, and feeling the stones with his hand 
to determine whether they were heated. I conceive the heat of the 
iron rim of the wheel, when dragged along the ground, must have 
been considerably greater than that of boiling water, for in an in- 
stant (while dragged along the ground at the ordinary rate) it heated 
the water in its way so as to make it smoke very strongly. Here 
the waste of heat must have been very great, as the same spot of the 
wheel came continually in contact with water not much higher than 
