United States. Surgeon-General's Office, American Roentgen Ray Society · New York : Middleditch · leaf 217
Fig. 9. Adjustment for exposure of accessory sinuses In the posterior-anterior direction. 209 … Fig. 10. Adjustment for exposure of accessory sinuses in the] lateraldirection. 210 HEAD EXAMINATIONS 211 centered so that the principal ray passes directly throughthe frontal sinus. This is to obtain a true representationof the depth of the sinus and the thickness of theanterior wall. The head is…
![An illustration from Experimental investigation of the spirit manifestations, [electronic resource] demonstrating the existence of spirits and their communion with mortals. Doctrine of the spirit world respecting heaven, hell, morality, and God. Also, the influence of Scripture on the morals of Christians (1855)](https://img.insideoutlibrary.com/img/200/ia-experimentalinv00hare-9-0.webp)
