Sacramento daily record-union. [volume] (Sacramento [Calif.]) 1875-1891, 1882-01-02
-Note-The mean winter humidity is for the win
ters of lsl7-s 1879 Iszn-

fNote-The mean winter humidity is for the vim
ters OF 1s77-S, 1889, 1S79-So, 1Ss0-S1.
The winds direction is obtained by large
wind vane placed securely upon the roof of
the building, and revoives upon spindle,
the lower end of which extends through the
roof, about an inch below the ceiling OF the
Signal Office !; attached to the lower Extremity
of this spindle is gilded arrow, which
always points in the same direction as the
exposed vane upon the top of the building.
This gilded arrow moves around circle on
which is painted the eight cardinal points of
the compass. and indicates the point from
which the wind blows. The circle is painted
on the ceiling of the office.
THE VELOCITY OF THE WIND
Is determined by the anemometer, which is
also fixed securely upon the roof OF the build
ing at an elevation great enough to not be
obstructed from the full force OF the winu ty
adjoining buildings. This aremometer con-
sists of four equal metallic cups, in the form
of hemispheres /; attached to two arms
crossing each other at right angles, and are
supported 30 as to turn freely about versi-
cal axis. The base OF each cup is in yerti-
cal position, and since the action OF the wind
xpon the concave side Ct one Of these cups
is greater than the action upon the convex
side, moderate breeze IS sufficient to main
tain the arms in CONTIGUOUS motion. At
tached to this instrument IS Gibbons self
register, which registers the velocity OF the
wiod by electricity. This selffegister in the
Office is attached 80 tha anemomster npon the
roof, by connecting wires leading from an
Eagles battery, where the electricity is gen
Grated. The self-regieter coInp1l-es al electro
magnet, armatuEe ard clock work The srUIa-
ture mas pencil lead attached By means OF a
brass holder the pencil constantly rests
upou prepared sheet Of paper wrapped
around the cylinder aud secured by rubber
bands; this cylinder revoives uniformly by
means of the clock work; the movements
of which correspond TO hhe time f day.
The paper is ruled, and laid cut in hours and
minutes, by watch it can De ascertained at
what minute heavy gust Of wind started
up; bow long 1t continued whsthsr day or
night On each occasion, whsn the wind has
travelled one mile (tke cups upon The roof
| making 500 revolution the electric circuit is
closed by means Of spring which briugs
two platinum points together. Attached to
these platinum points bv means Of lindiOg-
screws are two wires | dag from battery
in the Office, and havi, z tie self-registar in
its circuit; when the circuit closes the
armature is attracted by the ;nsguetiz ton
of the
ELECTRO MAGNET;
The mile is then Registered upon the rec I'd
or thermometer sheet This ins.rune..tal
combination is constantly in operation, and
faithfully records each mile OF wind as it
passes the station This PREPARED shee. of
pape, is replaced every twensyiou hours at
II NJ. 10 ;al time. rnakins each Sheet COM
plete record of the daily velocity Of ;he wind.
The following table shows the prevailing
wind and total velocity for each year, and fer
the season of each year from 1877 TO 1881
(mean direction and velocity for winter Is
for the winter of 1877 S, 1873 9. 1879 so,
1SS0-il: