wn the upper cord, the curtain will be entirely un- forming a saliva receptacle. When the air is exhaust- wound and the whole window covered. Then it can the amount of pressure may be readily determined. ed from the receptacle, the vacuum created causes the This invention has been patented by Mr.… … pin being held above the link opening. As the draw- PARSON'S DENTAL APPARATUS. heads come together and the link enters the empty tube, c, to the bottle. Leading from the air discharge drawhead, the pin thereof is dropped through the link, outlet of the pump is a tube connecting with a close air and…
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