19^2 Scientyic Intelligence. 
like that of several carriages in motion. About thirteen miles 
farther down Lochfine, some of the peasantry were much alarm- 
ed at seeing their furniture violently shaken. The day was 
rainy and lowering ; and about four o’clock there was a loud and 
continued peal of thunder, with some vivid flashes of lightning. 
28. Method illuminating the Dials qf Public Clocks with 
Gas. — Messrs John and Robert Hart of Glasgow, who have 
been long known to the public for their scientific acquirements, 
as well as their practical ingenuity, have erected a very inge- 
nious apparatus for illuminating with gas the dials of the Tron 
Church and Post-office steeple in Glasgow. ‘‘ The apparatus 
consists of a No. 1. Argand burner, placed a few feet out from 
the top of the dial, and enclosed in a nearly hemispherical lan- 
tern, the front of which is glazed, — the back forms a parabolic 
reflector, — the dial receives not only the direct, but a conical 
stream of reflected rays, and is thus so brilliantly illuminated, 
that the hours and hands can be seen with nearly the same dis- 
tinctness at a distance as through the day. To mask the obtuse 
appearance of the lantern, its back has been made to assume the 
form of a spread eagle, above which is placed the city arms, the 
whole handsomely executed and gilt. The gas-pipe and lan- 
tern move on an air-tight joint, so that the lantern may be brought 
close to the steeple for cleaning when necessary. The gas is 
first ignited by means of a train or flash-pipe, so perforated, 
that when the gas issuing from the holes at the one end is light- 
ed, the holes along the pipe become so, and thus the gas inside 
the lantern is kindled as if by a train of dry gunpowder : in this 
way the light might be first communicated either from the street 
or from the steeple. The effect of the lighted dial is at once 
cheerful, pleasant and useful. By a simple contrivance, the 
clock disengages a small detent, something similar to the larum 
in wooden clocks. This shuts the gas cock, and instantly ex- 
tinguishes the light.” We should wish to see this apparatus 
erected in our own city, and we have no doubt that the Gas- 
Light Company wilj imitate their friends in Glasgow, by sup- 
plying gratis the gas which ma}^ be necessary for this pui-pose. 
29. Lithographic . Paper. — M. Senefelder, the celebrated pro- 
moter ol' the lithographic art, has lutely invented a kind of paper 
