<p>Original 1943 electrical trade vintage ad for<b><span style="font-size: 14px;"> ROLLER-SMITH COMPANY. </span></b>Main office and plant was located in Bethlehem, PA.</p><p> Manufacturers of Electrical Measuring Instruments. </p><p>Can You Read This Dial From 15 Feet?</p><p>From what distance can yo clearly see the numbers and scale divisions on a Roller-Smith switchboard instrument? Hand drawn on lithographed metal, and with a scale length of 5.5 inches, the dials on these instruments have been accurately read by persons with normal vision, at a distance of 15 feet. The advantages of such visibility to a busy station attendant are obvious.</p><p>Unbound from a 1943 electrical engineering magazine, this unique old one-page advertisement would display beautifully matted and framed. Nice graphics. World War 2 propaganda. A fabulous addition to your retro electrical library.<br></p>
- SKU zl511
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