Explosion-proof headlamp and power source

Claim 1

AN EXPLOSION-PROOF HEADLAMP HAVING ITS OWN CONNECTED SOURCE OF ELECTRICITY AND ADAPTED TO BE WORN IN AN EXPLOSIVE GAS ATMOSPHERE, COMPORISING: A LIGHT-WEIGHT LAMP ASSEMBLY HAVING A FIRST CLOSED CHAMBER AND A SECOND CHAMBER HAVING A SEALED TRANSPARENT WINDOW IN ONE FIRST CHAMBER HAVING A SEALED TRANSPARENT WINDOW IN ONE WALL THEREOF, A SEALED GLASS LAMP ENVELOPE SUPPORTED IN THE FIRST CHAMBER AND HAVING A FILAMENT AND EXTERIOR LEAD WIRES CONNECTED TO THE FILAMENT, A PAIR OF TERMINALS SUPPORTED IN THE SECOND CHAMBER, CURRENT CARRYING MEANS CONNECTING THE TERMINALS TO THE LEAD WIRES WITH AT LEAST ONE SUCH MEANS BEING INSULATED IN THE WALL BETWEEN SAID CHAMBER; A BATTERY PACK ASSEMBLY HAVING THREADEDLY ENGAGED HOUSING PARTS DEFINING A CENTRAL CLOSED CHAMBER, A PLURALITY OF LOW-VOLTAGE RECHARGEABLE DRY TYPE BATTERY CELLS AND A DISCHARGE CURRENT LIMITING RESISTOR MOUNTED IN SAID CENTRAL CHAMBER; AND INSULATED CURRENT CONDUCTING MEANS INCLUDING A FLEXIBLE CORD CONNECTING SAID TERMINALS AND SAID BATTERIES AND RESISTOR IN A LOW-VOLTAGE SERIES CIRCUIT, SAID SECOND CHAMBER AND SAID CENTRAL CHAMBER HAVING ENTRANCE PASSAGES FOR SAID CORE, A RESILIENT STRAINRELIEIVING PLUG AROUND THE CORE AT EACH OF SAID ENTRANCE PASSAGES, AND DISCRETE NON-INFLAMMABLE FIBROUS PACKING MATERIAL AROUND THE CORD IN SAID CENTRAL CHAMBER ENTRANCE PASSAGE, WHEREBY CURRENT IS LIMITED IN SAID CORD FOR PREVENTING OVERHEATING IN CASE OF A FAULT IN THE CORD, AND SAID FIRST CHAMBER IS CLOSED TO SUPPRESS STHE PROPAGATION OF ANY FLAME THEREIN TO THE OUTSIDE.