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 only 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 thai six hours: 
Arr. X.—Pearson’s Patent Domestic Telegraph. 
(Communicated for this Journal by the Inventor.) 
Tue Domestic Telegraph has for its recommendations 
the follow ing advantages, viz. 
1. The ease, facility and dispatch with which domicsite 
wants may be supplied. 
2. The great saving of labour to domestics, randehiag 
their attendance less irksome to themselves, and more ac- 
ceptable to principals. 
3. The privacy with which domestic communication may 
be held in the presence of company ; and in many other 
cases that often occur. 
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 arawiwess it will be per- 
cieved that by the Indexes, a. a. moving over two dials, 
B.B. an almost instantaneous communication is effected— 
they operating simultaneously by means of the connecting 
rods, ¢.c. and wheels, D.D. The motion, giving the dlarm 
to direct the domestic’s attention to the face of the dial, is 
by means of the small pinion, e. and rod, f, connected to the 
Wheels, d. d.—on whose centre of motion two small bells, 
g. g. are fixed, with their peripheries facing each other. A 
small space is left between the bells to give freedom to their 
vibration—to produce which a cast iron ball is enclosed be- 
tween them, and revoives on the inner side of their extrem- 
ities. The dials are divided by zones into three divisions— 
the inner of which contains the letters of the alphabet—the 
next extertor, figures to the number of 30—the outer is di- 
vided into 30 compartments, each of which contains the 
* See the end of the volume. 
