Antique 1920's Blueprint: "Reading Senior High School Electricity - Standard Radio Symbols"

​Up for auction/sale is a rare and original vintage blueprint schematic diagram chart titled "READING SENIOR HIGH SCHOOL - ELECTRICITY - STANDARD RADIO SYMBOLS".

​This authentic industrial/educational blueprint features detailed technical illustrations and drafting symbols from the Golden Age of Radio. It includes early electronics schematics such as:

• ​Vacuum Tubes: Three Element Vacuum Tube, Screen Grid Tube, Screen Grid A.C. Tube, Half-Wave & Full-Wave Rectifiers.

• ​Early Components: Crystal Detector, Peridyne Symbol, Variometer, Neon Glow Tube, Filament Ballast, Electro Dynamic Speaker, and Phonograph Magnetic Pick-Up.

• ​Classic Wiring & Tuning: Variometer, Intermediate Frequency Transformer (Super-Heterodyne Set), Condenser Blocks, and Aerial / Counterpoise layouts.

​A fantastic piece of early 20th-century technical drafting and radio history, perfect for framing, industrial display, radio room/shack decor, or antique electronics collections. Frame not included.

​📐 Item Details & Specs:

• ​Type: Original Blueprint (White lines on traditional deep blue paper background).

• ​Dimensions: Approx. 8" x 10.5" (Please reference measurement photos for exact sizing).

• ​Origin: Reading Senior High School (Industrial Arts / Technical Electricity Class).

• ​Era: Circa early to late 1920s.

​🔎 Condition Note:

• ​Vintage original paper condition with authentic age character.

• ​Displays expected light edge wear, minor toning/foxing on the blank reverse side, and minor corner pinholes or handling marks typical for genuine shop-class ephemera.

• ​Colors remain strong and sharp. Please review high-resolution photos closely for complete visual condition details.

​📦 Shipping & Handling:

• ​Protection: Shipped flat in a rigid sleeve backed by heavy cardboard inserts to ensure safe, bend-free transit.

• ​Tracking: Ships fast via USPS fully insured with full tracking included.