190 Proceedings of' the Society of Arts for Scotland. 
%*lth Dec. 1822. — Mechanical Arts. — At this meeting the fol- 
lowing communications were made to the Committee. 
1. A new method of raising the hulls of sunken vessels ; by 
Mr David Masterton, Glasgow. 
2. A model of a new method of applying the power of steam 
to impel boats ; by Mr R. Whytock, Edinburgh. 
S. A model of a new construction of wheels for carriages, called 
a Moveable Railway ; by Mr Heriot, Duddingston. 
4. A new instrument called an Eidograph, for copying, re- 
ducing, and enlarging drawings ; by Professor Wallace. 
5. A method of forming epicycloidal teeth on watch and clock 
wheels ; by Mr Lecount, R. N. 
6. A method of softening and dispersing the light of ground glass- 
shades for lamps, so as to prevent any injury to the eyes 
of those who use them ; by Dr Brewster, Edinburgh. 
7. A method of constructing large lenses for light- houses or foi 
burning glasses ; by Dr Brewster. 
8. An improved percussion lock ; by Mr Forrest, Jedburgh. 
9. A model of a new method of propelling boats ; by Dr Ran- 
ken of the Honourable East India Company’s Service. 
10. An improved Saccharometer ; by Mr Peter Hill, optician, 
Edinburgh. 
11. An Apograph, for copying, reducing, and enlarging draw- 
ings ; by Mr Andrew Smith of Mauchline, Ayrshire. 
12. A new universal standard wire-guage ; by John Robison, 
Esq. 
These different inventions were examined and reported upon 
by the two Committees, at meetings held on the 31st December 
1822, on the 7th and on the 14th January 1823. 
17th March. — At a general meeting of the Society held this 
day, Alexander Irving, Esq. in the chair, the Secretary read a 
report on the state and prospects of the Society. Various mo- 
dels of useful inventions were laid before this meeting, besides 
those which were regularly submitted to the Society. The fol- 
lowing were among the most important. 
1. A steam and sailing vessel of an improved construction ; by 
Andrew Waddel, Esq. Hermitage Hill, Leith. 
2. Steam-boat paddles ; by Mr John Milne, teacher of archi- 
tectural drawing. 
