. X-rays simply explained : a handbook on Röntgen rays in theory and practice . >art ofa leg. For the thorax 18 in. or 20 in. will give fairresults, but if the apparatus is powerful and accuratelocalisation is desired, this distance should be in. is a good standard distance for simplesmall. work with a good coil. IVial Krposure.—Let it be assumed, by way ofexample, that, from the data given below, theestimated exposure is about 1| minutes. Thecurrent is turned on, the subject keeping his handperfectly still, and at the expiration of J minute thedischarge is stopped; about 1^- in.
. X-rays simply explained : a handbook on Röntgen rays in theory and practice . >art ofa leg. For the thorax 18 in. or 20 in. will give fairresults, but if the apparatus is powerful and accuratelocalisation is desired, this distance should be in. is a good standard distance for simplesmall. work with a good coil. IVial Krposure.—Let it be assumed, by way ofexample, that, from the data given below, theestimated exposure is about 1| minutes. Thecurrent is turned on, the subject keeping his handperfectly still, and at the expiration of J minute thedischarge is stopped; about 1^- in. of the hand at thefinger-end is now covered by the lead plate, anotherhalf minute of exposure being given. The plate isnow moved so as to cover another Ih in. and a third PRACTICAL X-ltAV WOKK HI ILATK Successive Trial Exposures from 10 to 40 seconds, 9 spark Biauodal Tube warmed down to 3^ alternative Cathodal Plate (whole-plate size). Distance betweentube and plate 12. Metol Quinol Developer applied for 20minutes as described in text. •)2 x-HAVs simply explained lialf-ininmc is )^ivtii, ;intl so itii uiilil ihiii* is only(»m» small strip loft uncovonMl. If the load plate sousetl causes incMHivenieiicj, it may lie made to rest onsuitid»le Mocks so placed that it l)rid«^es the handwithout touching it. When exposures are lonj^r oi- injury has made thesul»ject shaky, or when successive exj)osures areriMpiired, as in stereoscopic work, sand-bags areoften valuaV)le lor preventing moxruicnt. The emulsion of the ]date is now divideil intodilVerently ex}»osed strips whose time values areA. 1, U, 2,2^, and .. minutes. See IMate III. If there is mucii doul»t as to the approximateexposure, the diflerence between the successive ex-posures may be increased, I
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