Lkt of Scottish Patents . ^03 
sequence of this decided superiority of Aberdeen granite, the 
arch-stones of the Bridge of Aberdeen, built of Aberdeen gra- 
nite, have only about one-half the depth of the arch-stones of 
the Strand Bridge built of Cornish granite, although the span of 
the arch in the former is about 10 feet wider than the span of 
the arch in the latter. The Committee of Management of the 
London Bridge has advertised for specimens of Granite from 
different parts of the kingdom, and their relative strengths are 
to be determined by the Royal Society of London. 
Art. XXXI I. — List of Patents granted in Scotland from 
8th Jugust to 4th December 1823. 
21. T?0 John Butler and Ellis Gleeave, of Manchester, 
in the county of Lancaster, machine-makers, and partners in busi- 
ness, for “ a new machine-engine, or mechanical contrivance, for 
feeding or supplying steam-boiler furnaces, or other furnaces, 
with coals, cokes, or other fuel, by machinery, whereby the 
quantity of smoke proceeding therefrom is greatly reduced, and 
a great saving is effected in the quantity of fuel consumed, and 
in the labour necessary for feeding and supplying the same 
therewith.’’ Sealed at Edinburgh 28th August 1823. 
22. To Thomas Leach, of Friday Street, London, mer- 
chant, for ‘‘ improvements in certain parts of the machinery for 
roving, spinning wool, cotton, silk, flax, and all other fibrous 
substances.” Sealed at Edinburgh 6th September 1823. 
23. To Thomas Hancock, of Goswell, Parish of St Luke’s, 
Old Street, county of Middlesex, patent cork-manufacturer, for 
‘‘ an improvement in the preparation of various useful purposes 
of pitch and of tar, separately or in union, by an admixture 
of other ingredients with either or both of them.” Sealed at 
Edinburgh 5th September 1823. 
24. To Archibald Buchanan, of Catrine Cotton-Works, 
one of the partners of the house of James Finlay and Co. mer- 
chants in Glasgow, for an invention of an improvement in the 
construction of weaving-looms, impelled by machinery, whereby 
a greater quantity of cloth may be weaved in a given time, with- 
out injury to the fabric, than by any application of power for 
that purpose heretofore employed.” Sealed at Edinburgh 10th 
October 1823. 
