powder from adhering on and along the under surface 22b over the front end 22a of the feeder 22 to finally drop on the balance 5 the feeder 22 may be provided with a protective cover 28 as shown in fig7 fig8 shows another embodiment of the feeder 22 provided with a shatter 29 fig9 u02dc 12 show modifications of the powder container 8 which are preferably used for powders having a tendency of aggregating to form lumpsof powder in the container in fig9 a screen 30 is arranged within the container body 21 to prevent a lump of powder 31 or a large particle 32 from feeding out of the container 8 in fig1 a baffle plate 33 having spiders 34 radially extending from thecentral portion thereof as shown in fig1 is arranged within the containerbody 21 to prevent a large particle 32 from feeding out of the container 8 fig1 is a further modified embodiment of the powder container 8 in thisembodiment an agitator 35 having a plurality of agitating blades 36 radially extended from a rotary shaft 37 is arranged within the container 8 by rotatively supporting the rotary shaft 37 in a bearing on the cap 23 and is driven by means of miniature electric motor 38 so as to agitate thepowder 31 in the container 8 fig1 shows another embodiment of the feeding means comprising a feed screw 39 extended through the container body 21 and drivably connected to an electric motor 40 fig1 is a further embodiment of the feeding means in this embodiment the container 8.