Hartford Steam Boiler Inspection and Insurance Company · Hartford, Ct. : Hartford Steam Boiler Inspection and Insurance Co · leaf 62
tford Magniscope, a magnifying periscope with n cameraattachment used to photograph the walls of rivet holes in caustic- embrittlement investigations, has been patented for the HartfordSteam Boiler Inspection and Insurance Company by Jared P. Morrison,assistant chief engineer of the boiler… … W The Hartford Magniscope on which patents were granted. The circular openingat the left is aimed at the wall of a rivet hole. plates. It comprises a rigid tubular casing (See illustration, 1) con-taining magnifying lenses and a reflector for directing light rays uponthe lenses, said reflector…
Locomotives · Steam-boiler explosions
Internet Archive · Carnegie Library of Pittsburgh · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-315-232.webp)
