. A text-book of radiology . Fig. 14. Mica Regulator—in accessory bulb above. The special devices for lowering the vacuum may bedivided into two main classes. (a) Those in which gas is liberated from some sub-stance placed inside the tube, or, what is more common,in a small accessory bulb or chamber communicatingwith it. A good plan is to put a piece of carbonaceous materialin an accessory chamber and mounted on a wire com-municating with a terminal outside. In use, one of thewires to the tube was attached to this terminal, and thecurrent passed for a few seconds at a time, until thedesired ef
. A text-book of radiology . Fig. 14. Mica Regulator—in accessory bulb above. The special devices for lowering the vacuum may bedivided into two main classes. (a) Those in which gas is liberated from some sub-stance placed inside the tube, or, what is more common,in a small accessory bulb or chamber communicatingwith it. A good plan is to put a piece of carbonaceous materialin an accessory chamber and mounted on a wire com-municating with a terminal outside. In use, one of thewires to the tube was attached to this terminal, and thecurrent passed for a few seconds at a time, until thedesired effect was obtained. With this device there issome risk of overdoing the process, and it is to be used VACUUM REGENERATORS. 43 with. care. Other substances are used by different makersworking on the same principle, all of which are more orless efficient. Another device having very good qualities is in use byMuller. A number of discs of mica are mounted on astout aluminium wire in the accessory bulb, and this wirecommunicates
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