. Elementary and dental radiography / by Howard Riley Raper . r only about 4 inches and the tube so reduced in vacuum, if necessary, that even this short gap is not backed up. Splendid black and white negatives are made by this technic. It is important to know that the time of exposure necessary, and so the milliampere-second dose, is greater when the soft tube technic is employed. Both Drs. Ottolengui and Barber, each indepen- RubbcrnDammeKmt> dent of the other have suggested to tne writer thata rubber dam clamp may be used to hold the filmpacket in position during the exposure. 350 APPEND
. Elementary and dental radiography / by Howard Riley Raper . r only about 4 inches and the tube so reduced in vacuum, if necessary, that even this short gap is not backed up. Splendid black and white negatives are made by this technic. It is important to know that the time of exposure necessary, and so the milliampere-second dose, is greater when the soft tube technic is employed. Both Drs. Ottolengui and Barber, each indepen- RubbcrnDammeKmt> dent of the other have suggested to tne writer thata rubber dam clamp may be used to hold the filmpacket in position during the exposure. 350 APPENDIX Uertical Position of The man who makes only a few film, dental MtilSSr**** radi°graPlls will find it convenient to use a glasstumbler or cup instead of trays for his developingand fixing solutions and wash water. Fasten the exposed films to a hookclip. (Fig. 119.) Hook the clips over the side of the tumbler or cupsuspending the film inside. This makes the handling of the films verveasy and .affords the advantage of having the films in the developing and. F. Van Woert film-holder and indicator fixing solutions in a vertical position so no sediment can settle on thesensitive , - iTi—hi,,,. A vessel, something like a berry dish, will be Tilm ncoatiocs found better than a tray -for washinS sma11 filmnegatives, for the water falling from a faucet causes more movement of the water in such a dish and so washes the negatives better and quicker. Negatives can be picked up in such a dish with greater ease than they can from a tray. Such a dish should not be used when the tap water is warm, as the movement of the negatives will scar them. In cases where there is an excessive flow of Salivation. saliva, particularly when the outfit used necessitates a rather long exposure, if the films are protected from moisture only by paper, it is expedient to take the film packet from the mouth after exposure and immediately squeeze it between pieces of blotting paper. This may avoid w
Size: 1719px × 1454px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookauthorraperhowardriley, bookcentury1900, bookdecade1910
