An interesting, and rare, slide rule type pineal calculator. Printed in the USA. In very good condition. Original envelope shows wear. Ruler looks very good with no damages and has original slide. Images and plastic have no damage.
In some 50% of normal adults, the pineal gland, a small midline structure of the brain, may contain an agglomerate of tiny calcifications totaling a few millimeters in size and which may be visible on standard X-ray films of the skull. An intra-cranial hematoma or a space-occupying lesion of some size would displace these calcifications in the opposite direction.
Displacement may be determined on an antero-posterior X-ray of the skull by the use of any standard ruler. For determining any anterior or posterior displacement on a lateral view, the Neurological Institute of New York devised, early in the second half of last century this plastic ruler with a sliding component, much like the good old mathematical slide-rule.
Please ask any questions/look at all pictures and description carefully before purchasing. Always examine the photos carefully, and if in doubt, contact us with any questions you may have. The photos provide additional condition information. Items come from a smoke-free home. We ship the next business day. Actual color(s) may appear slightly different depending on your screen resolution and/or device used.