Science – Radio-Guy

Early 20th Century Anatomical Model of a Hen

steveanddan — Wed, 05 Nov 2025 19:38:55 +0000

This is an early life size size hand-painted paper mache and plaster anatomical model The paint and condition is very nice for something almost 100 years old. 18 inches tall x 16 inches wide... $1250

Knott – Induction Coil

steveanddan — Fri, 27 Jun 2025 18:41:10 +0000

E.I. Company – “Bull Dog” Spark Coil

steveanddan — Fri, 27 Jun 2025 18:11:15 +0000

Elektro-Vulkan Induction Coil

steveanddan — Fri, 27 Jun 2025 16:38:56 +0000

Welch Sample Tubes

steveanddan — Thu, 05 Jun 2025 15:07:22 +0000

American Plate Electrical Machine, ca. 1860

steveanddan — Wed, 30 Apr 2025 16:27:49 +0000

An elegant mid-19th century single-disc friction machine with turned hardwood pillars, brass fittings, and original clear glass plate—mounted on a classic cross-base with original aged patina. The green-painted collector shows flaking consistent with age, supported by a hand-blown glass pedestal insulator. While untested, the machine appears largely complete, retaining its original crank, rotating shaft, and collector arm. These early American electrostatic generators were used to demonstrate electrical charge and spark discharge in lecture halls and medical offices alike. A striking relic from the early days of electricity, ideal for display. $1400

Compact Wimshurst Influence Machine, Signed “MC”

steveanddan — Wed, 30 Apr 2025 16:19:44 +0000

A compact and visually striking Wimshurst electrostatic generator, likely late 19th to early 20th century, featuring dual contra-rotating disks with prominent radial foil sectors, twin Leyden jars, and brass discharge terminals. Signed simply "MC" at the base, this example is built on a cast metal platform and includes all major mechanical elements intact, though untested for functionality. The machine displays age-appropriate wear and patina, with oxidation to the foil and minor clouding in the glass capacitors—ideal for collectors of vintage physics apparatus and early electrical devices. ... $575

E. Thacher Cylindrical Slide Rule – With Original Case – Circa 1880s

steveanddan — Mon, 21 Apr 2025 14:48:12 +0000

A true monument to 19th-century engineering, this E. Thacher Cylindrical Slide Rule compresses over 40 feet of logarithmic scale into a beautifully machined rotating brass drum, designed for high-precision calculations long before the age of digital computing. Manufactured by Keuffel & Esser, this example shows its age with mellowed paper scales, gentle oxidation to the brass and steel framework, and a warm aged patina throughout. Still complete and solid, it comes housed in its original dovetailed hardwood case, scuffed and scratched as expected, but fully intact and functional. A classic piece of analog computing history, ready for display. $650

Tru-Sonic, Model OD-4 Oscillator and Demodulator

steveanddan — Tue, 15 Apr 2025 19:36:57 +0000

Stephens Manufacturing Corporation produced this Tru-Sonic, Model OD-4 Oscillator and Demodulator

Electric Leak Locator – Type T – W.S. Darley and Co.

steveanddan — Tue, 15 Apr 2025 15:01:42 +0000

A rare and fascinating piece of industrial history, the W.S. Darley & Co. Electric Leak Locator Type T is a vintage leak detection tool used for pinpointing underground water leaks in pressurized systems. Crafted with precision in the mid-20th century, this robust device combines early electrical engineering with practical leak detection technology. Featuring a transmitter and receiver setup, the Type T works by sending electrical currents through water pipes to detect changes in resistance caused by leaks. Whether you’re a collector of antique industrial tools or a professional with an interest in the evolution of leak detection, this rare find offers a glimpse into the pioneering technology that paved the way for today’s modern systems. A true gem for anyone passionate about vintage engineering! …$200