Bengal Pioneer Instruments: J.C. Bose 1895 Laboratory Workbench

Spark Gap: 2.5 mm

Polarizer Grid: 0° (Pass)

PHYSICAL TELEMETRY CALCUTTA 1895

Apparatus State	HIGH RESISTANCE (IDLE)
Microwave Frequency	60.0 GHz
Wavelength (λ)	5.0 mm
Coherer Resistance	20,000 Ω
Galvanometer Deflection	0.0°
Local Relay & Bell	SILENT
Optical Amplification	20,000x
Tissue Elongation	+0.32 μm/sec
Copies Stenciled	0 pamphlets
Distributed (Bande Mataram)	0 distributed

HISTORIC LABORATORY LOG

[1895.05.01] Bench prepared at Presidency College, Calcutta.

[SYS] 5mm brass spheres aligned in focal spark chamber.

Acharya Jagadish Chandra Bose (1858–1937) invented the horn antenna, dielectric lenses, wire-grid polarizers, and point-contact semiconductor detectors in Kolkata—pioneering mm-wave radio 60 years before the microwave revolution.