314 Domestic Telegraph. 
The projecting parts are turned true, and should be bedded 
in brass or steel dies; placed, of course, on a competent 
frame. The sixth part of a revolution of the portions of the 
gudgeon thus supported, is the oaly source of friction to 
which this beam is subject during the whole period of the. 
descent of the Gasometer ;—which, in large ones, does not 
ordinarily take place in less than six hours. 
Ant. X.—Pearson’s Patent Domestic Telegraph. 
(Communicated for this Journal by the Inventor.) 
& Domestic Telegraph has for its recommendations 
the following advantages, viz. 
1. The ease, facility and dispatch with which domestic 
wants may be supplie 
The great saving of labour to domestics, rendering 
their attendance less irksome to themselves, and more ac- 
sapalte to principals. 
3. The privacy with which domestic communication may 
be held in the presence of company ; and in many other 
“a 
4. In cold weather, obviating the necessity of so fre- 
quently opening the doors of. apartments, which is so in- 
commodious and disagreeable ; besides admitting the influx 
of cold air. 
5. By reference to the annexed drawing,* it will be per- 
cieved shat by the bard a.a. moving over two dials, 
B. B. an almost instantaneous communication is effected— 
they operating siemalanngeuate bes means of the connecting 
rods, c.¢c. and w pa tee ving the alarm 
to direct the read s ee to the face of the dial, is 
by means ot the small pinion, e. and rod, f, renee to the 
Vheels, d. d.—on —_ centre of motion tw ’ 
g. g. are — with their peripheries facing come other. 
small space is left pecans the bells to give freedom to a 
pone produce which a cast iron ball is 
tween them, and revolves * the i inner side of their vee 
ities. e dials are divi zones into ee, 
Se ieer of which contains yh letters of the alphabet—the 
to the number of 30—the outer is s di- 
vided into 30 compartments, each of which contains the 
* See the end of the volume. 
‘ i. 
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seeneieeeeeenean ti = 
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