Perrygraf Clipper Cargo Dimensional Weight Computer Circular Slide Chart

This instrument consists of two pieces of blue and white rectangular cardboard, riveted together at the corners. It is marked with a circular logarithmic scale of weight in pounds that ranges from 1 to 250. Inside this is a scale of lengths from 50" to 10". A white disc attached below that scale has a scale of heights from 5" to 30" and a scale of widths from 30" to 6". A paper indicator is attached on top of the disc. It contains a scale of densities in cubic inches per pound from 300 to 200 and three steps of instructions. This slide chart is marked: CLIPPER CARGO (/) DIMENSIONAL WEIGHT COMPUTER. It performs the same function as 1996.3029.01.

Unlike the other object, a rectangular piece of white cardboard slides inside the instrument to also permit readings of conversions from kilograms to pounds on the front and readings of pounds to kilograms on the back. This part of the chart is marked: WEIGHT CONVERTER. The bottom of the chart is marked: PAN AMERICAN, with LEADERS IN AIR CARGO on the front and SPACE CAN BE RESERVED on the back. The back also has an advertisement: CLIPPER CARGO (/) Reduces Pilferage (/) Reduces Damage (/) Reduces Inventory (/) Extends your working capital!

The lower left corner of the front is marked: Slide-Chart Copr. 1957, (/) PERRYGRAF Corp., Maywood, Ill. The lower right corner is marked: *T.M. Reg. U. S. Pat. Off. Perrygraf was a very successful producer of promotional slide charts. In 1968, the company was sold to Nashua Corporation and moved to Los Angeles, Calif.

Reference: Walter Shawlee II, "The Wonderful World of Slide Charts, Wheel Charts, and Perrygrafs," Sphere Research Corp., http://sphere.bc.ca/test/perrygraf.html.

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