1825.) 
spectators’ part of the theatre, and the sky- 
Jighted transparent cieling thereof, though 
the objects of great wonder to many of the 
visitors, is not claimed in the specification 
as the invention or exclusive property of 
the patentee. 
The dioramic pictures or scenes are 
transparently painted on canyas stretched 
‘on frames, or else by weighted rollers at- 
tached to the lower edges of the pictures ; 
these last being hung before very large 
windows in the back of the building, but 
at sufficient distances from those windows 
to admit of several transparenj-coloured, 
or dyed screens being occasionally let 
down by cords and pullies, or drawn aside, 
in the manner of curtains, as often as a 
moving or changing scene is intended to be 
represented. 
In the roof of the proscenium, or space 
between the spectators andthe picture, 
there are large sky-lights, furnished with 
transparent-coloured curtains or screens, 
moving upon hinges, by means of cords and 
pullies, so as to throw or exclude, and to 
modify, the light on the front of the pic- 
ture, according as any moving or changing 
scene is intended to be represented by the 
artist. 
The open front of the amphitheatre for 
the spectators, towards the picture, is con- 
tracted, by fixed partitions and opaque 
screens, so as to conceal the margins of the 
‘pictures, and the several screens and win- 
‘dows described above. 
To Witt1am A. Jump, of Middlewich, and 
Wuutam Court, of Manor-hall, Che- 
shire, for their improved Method of manu- 
facturing Salt.—15th June 1824. ; 
THE improvement here consists in. feed- 
ing the salt-pan, or concentrating boiler 
with heated instead of cold brine, for sup- 
plying the waste of evaporation, until a 
panful of brine is sufficiently concentrated, 
for being drawn off to cool, and crystallize 
its salt. The mode which the patentees 
adopt for first heating the brine is, by 
causing it to descend from an elevated re- 
servoir in a metal pipe, and pass across the 
upper parts of the several fire-places under - 
the salt-pan—this pipe then turning up, 
for discharging, at intervals, the brine thus 
heated, into the pan. A stop-cock on the 
pipe, between the reservoir and the fire- 
places, enables the attendant to keep the 
feed-brine in the heated part of the pipe, 
until it has acquired a boiling heat, and then 
to expel the same into the pan, by letting 
down cold brine into its place, 
The care and attention of the workman 
to turning the stop-cock, at the proper in- 
tervals, might be superseded, by placing a 
pyrometric bar of tin or zine in contact 
with the feed-pipe, just after it has emerged 
from the last fire-place: the expansion and 
contraction of which bar might, bya system 
oflevers (such as the writer hereof has sug- 
Remarks on New Patents. 
541 
gested for a distillery purpose, in p. 406 of 
vol. ly.), be made to open the stop-cock, 
whenever the brine, in the pipe, reached or 
nearly approached a boiling temperature ; 
and to shut again such cock, wheneyer the 
said brine was at or somewhat above the 
temperature of that in the brine reservoir. 
The invention above described is, in the 
patent and specification, expressly confined 
to the making of salt (meaning the muriate 
of soda), but it seems not less applicable 
to alum-making, and some other processes 
of manufacture; wherein the same might 
be adopted, without infringing this patent. 
To Grorce S. Harris, of Knightsbridge, 
Middlesex, for his Ambulatory Advertizing 
Machine, for giving Publicity, by Day and 
by Night, to Proclamations, Notices, or 
Advertisements intended for Universal 
Information, without the Defacement of 
Houses and Walls by Bill-sticking or 
Chalking.—2\st October 1824. 
THE patentee, in stating his claim, gene- 
rally to the principle of exhibiting placards 
on a moving vehicle, seems not to have 
been aware of the practice, for some years 
past, of the parcel-carts from the metropo- 
litan coach-inns, its errand-carts, &c., in 
exhibiting large coach-bills, lottery puffs, 
&c. &c. pasted upon them. The machine, 
particularly specified by Mr. Harris, consists 
of a low four-wheeled carriage, whose bed 
has, centrically between the wheels, a ver- 
tical hole for receiving a large bolt or pin, 
on which, asa centre, the octagonal lantern, 
about fifteen feet in height, for receiving 
the placards, may be turned round, at short 
intervals, by the attendant, whilst. the 
machine is being slowly drawn through 
the town, in order that persons, on both 
sides of the streets, may (if they will be at 
the trouble) see and peruse all the different 
placards contained in four or more com- 
partments in height, and eight in circumfe- 
rence: the large and conspicuous opaque 
printing, or painting of the placards facili- 
tating their perusal by day, and the trans- 
parent preparation of others of such pla- 
cards fitting them for perusal by night, by 
means of the lamps which are to illuminate 
them from within. The directions are very 
minute, as to how this wonderful machine 
is to be constructed, and the rain-water 
conveyed off its roof; how air is to be ad- 
mitted to its internal lamps; how the pla- 
cards are to be attached, &c. ; but on these 
we shall not enlarge: remarking only, in 
conclusion, that had this patent been taken 
a few years earlier, the “lottery nuisance” 
might thereby have been rendered a more 
intolerable one than it has been and still is ; 
and the frightening of horses in our streets 
by these “ Royal” puffing machines, might 
have been superadded. If Mr. Harris’s 
projected monopoly of moving placards 
were to succeed, what but the work-house 
or the tread-wheel could find employment 
for 
