Xiv CONTENTS. 
Page 
Mr. H. Waxxer on the Results of Free Trade ...sccsssscsesecsevsccesscceseveneeveoee 201 
MECHANICAL SCIENCE. 
President’s Address, on the Progress of Mechanical Science............... vevecess, ZO] 
Mr. W. Bripvezs Adams on a new Method of Constructing the Permanent 
Way and Wheels of Railways ..........cssseeseeseeeeesenees HOURC ESET bantoonaccricd abn’ 203 
Mr. W. J. AnmiTace on a few Facts connected with the Manufacture of Pig 
Iron in the neighbourhood of Leeds ..... eiseees taseeaedescanaeded sesestecessececceeeene 204 
Mr. W. H. BartHoLomew on Steam Tugs employed on the Aire and Calder 
Navigation ..0...sscscesesseseeneenesseteceasseseeecases wadeaioas daeednseccessedade seveeeees 205 
Mr. G. Bayuzy’s Description of a Floating Dry Dock ............cccseeseceessevees 206 
Rev. Dr. J. Booru on an Instrument for describing Spirals ............ Sedseecceas 207 
Mr. C. Broprick on the Roof of the New Town Hall of Leeds ..........++020... 207 : 
Mr. J. Bucxton’s Notice of some of the Articles shown in the Mechanical 
Section of the Leeds Exhibition of Local Industry .......ssssesesssessesenses soseae 208 
Mr. W. E. Carrett on some modern Appliances for Raising Water ..........2. 208 
Mr. Rosert Coxz’s Account of Lewis Paul and his Invention of the Machine 
for Spinning Cotton and Wool by Rollers, and his claim to such inven- 
tion, to the exclusion of John Wyatt ......c..ccccescscvcncevsnenscvesseensesencs seers» 209 
Mr. H. ConysEare on an Apparatus for laying down Submarine Telegraphic 
Cables ....... evecck Ueedtdcvcdtestetnored be vdedeeedact’é iilosdoedesbesedese ciatattesane, LOO 
Mr. Coombe on Expanding Pulleys....... aareeats SAS -Banacechcneenee Gaueewan eens seeeess 209 
Mr. Aurrep CrosskILu on Reaping Machinery .......csecaccessecseeeeeses seceseeses 209 
Mr. J. Exper on Double Cylinder Expansion Marine Engines...... sno abecnemenea ie 
Mr. F. Gatton’s Description of a Hand Heliostat..cccccscsscscscecscsesceseecstceees 211 
Mr, JosepH Giynn on the Economy of Water Power .......cccssssesesescetesseeee 212 
Mr. J. HopKinson on the Cause of Steam-boiler Explosions, and Means of 
Prevention ...... Seseenecneencsoece soo qcuueerarctemmcrcss Gesveacaceesanm@scasvessactbeaenapscf Gam 
_ Mr. E. Jonzs on the Drainage of the Metropolis ........scssecsseersceccetaresecseoes 213 
Mr. D. Joy on the Application of Mechanical Power to the Bellows of Organs 213 
Mr. Joun Macxintosu on the Application of Combustible Compounds to be 
MISE UD VV ATi coccccescasaassencecessasenen seeaes cena apeee bere Pacdincn naahan soccegecencens 214 
—— on Constructing and Laying Telegraph Cables... ..... 214 
Mr, J. Macxean on the Submersion of Electric Cables............s0cescseceseeenees 215 
Vice-Admiral Moorsom on the Performance of Steam Vessels, the Functions 
of the Screw, and the Relations of its Diameter and Pitch to the form of the 
Vessel ...ccccsscscces aevege yeieatunaisead acts bebeddtaavdendd hs deus Hrsosa deeb vaneeoehes ae 215 
Mr. Josepx Joun Murpuy on a proposed Floating Lighthouse......... vessasese, 21S 
Mr. Wriu1am Naytor on a newDouble-acting Steam Hammer .....s00..e0s0008 218 
Mr, J. O’Nerut on a plan for giving Alarms in Passenger Trains ..,..+s.cseesess 219 
Mr. JamEs OupHAm on the Gresham Buoy, for recording the Loss of Missing 
Ships at Sea .........06 Reaeoce evocnscetcaccseter dohentingacac sesenedledowas oapandests  canebauel9 
Mr. G. Rewnin on the Construction of Floating and Fixed Batteries ...s.sss166s 220 
Mr. T. J. StnseRMAN on a Universal Printing Press ssscccsssecceseesceeneeeee coves 220 
on a Universal Cock......... deed RiTe teas dennagene sedtanwretes SOE 
Mr. R, Smite on a Wreck Intelligencer.......csscsseccsectcsssscsvecesessereteeessevsee 221 
