Have you ever operated a Beardslee? We do it regularly at Stones River. Using the US Signal Corps standard dictionary of abbreviations & word shortening principles, messages were cryptic. Routine phrases were reduced to a few letters.
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The Dictionary of Abbreviations is the red jacketed book camera right of signalist Izabell teaching telegraphic key technique.
Range of the magneto powered signal was 5-8 miles. Just like the telegraph, messages were received & repeated for greater range. The Beardslee signal was not interceptable, a unique feature.
Visitors, especially young ones, find the slaved indicator on the receiving unit magical.
The opening phase of the Tullahoma Campaign was the Beardslee's finest hour. Specially constructed wagons carried miles of the single gutta percha insulated wire on man portable spools. Poles with a pointy foot & hook on top could be set up & wire run with remarkable speed. STRI has that equipment & does demo programs.
In one of histories great ironies, July 4th conjunctions, also marked the end of the Tullahoma Campaign. The terrain past the formidable barrier of Monteagle & its 2000' tunnel was a forage desert. All freight carried from the Nashville & Murfreesboro depots on the rebuilt N&CRR was equine feed. Rations & ammunition was transported by wagon. Fortunately, as commander of the Department of the Cumberland, Rosecrans could establish a 70 mile wide front along the Tennessee River & the (+/-) 100 miles back to his base without the territorial squabbles that plagued Bragg.
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A visual signal from the Sequatchie Valley in the east to Muscle Shoals in the west only took 45 minutes. Hazen's Brigade, in front of Chattanooga, had its own signal system using black & white flags. The A of the C was fully connected, a necessity in such country.
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Telegraphic coms were established with the 80 miles of wire that was loaded on wagons, ready for the advance.
Unlike Wheeler's videttes who could only gape in amazement at the enormously long pontoon bridge over the Tennessee before hiding in a cane break, The A of the C's signalists could establish contact across the river & onto the army & department HQ's in Murfreesboro. Lenette Taylor's 'The Supply For Tomorrow Must Not Fail.' is an eye opening account of what it took for the Murfreesboro Depot to support Rosecrans' advance on Chattanooga. Still in print from LSU Press, everybody ought to have this book.
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Lookout Mountain from the logistically vital Missionary Ridge veranda of Sugars BBQ.
In all candor, my Virginia-centric friends have a very hard time grasping the continental logistical support of the Tullahoma / Chattanooga Campaign. Today, the driving distance between the logistics base in Cincinnati & Chattanooga is 365 miles / 587 kilometers.