Notices respecting New Books. 297 
take a man and a boy three hours to print with one colour, or 
six hours to finish with two colours, may by this means be done 
in three minutes, or three minutes and a half, and then much 
more completely than could even have been imagined before the 
introduction of this invention.’ There are many new and im- 
portant hints thrown out in different parts of this essay, but we 
must refer our readers to the work itself for the particulars. Some 
copper-plate engravings of the new apparatus accompany this 
essay. 
The work before us, besides numerous known facts judiciously 
selected, contains so much new, curious, and useful information, 
detailed in a pleasing and popular manner, that we would will- 
ingly enlarge our extracts if we could find room: but our limite 
forbid this at present. 
A Praetical Treatise on propelling Vessels by Steam, &s'c. By 
RosBERTSON BucHANAN, Civil Engineer; illustrated with 
sixteen engravings. Svo. 204 pages. ‘ 
The subject to which this volume is principally devoted, has 
for some time occupied much of the public attention, After a 
short introduction, Mr. Buchanan states the peculiarities of the 
Clyde navigation, that being the river on which the first at- 
tempt, deserving of notice, to navigate by steam was made in 
this country in the year 1812: this forms the First Part; and 
here the author has introduced a popular account and descrip- 
tion of that inestimable invention, the Steam Engine —Part IT. 
contains descriptions of various modes which have been proposed 
or tried for propelling vessels. Parts II]. and VIII. an account 
of steam navigation on other rivers in Great Britain and Ireland.— 
An account of the steam boats in America occupies Part 1V.— 
Part V. is devoted to vessels in America propelled by means of 
machinery driven by from eight to thirteen horses or mules, 
working a gin on the deck.—Part V1. is dedicated to subjects 
relating to the theory and practice of Naval Architecture, as 
being intimately connected with steam navigation, and em- 
braces § 1. The resistance of fluids: § 2. Experiments illustra- 
tive of the motions of resisted fluids: § 3. Experiments made 
under the direction of the Society for the Improvement of Naval 
Architecture: § 4. Of the forms best adapted for stability: 
§ 5. Of the forms best adapted to prevent rolling and pitching : 
§ 6. Of steering: § 7. Improvements in ship-building—Mr. Sep- 
pings’s and Mr, Walters’s described: § 8, § 9. are occupied 
with hints respecting timber, and the removal of imperfections 
in the common construction. Part VII. Miscellaneous obser- 
vations.—An Appendix. 
This work deserves commendation, The subject of steam- 
navigation 
