PSM V19 D346 The spectrophoneSimilarDouble bulb X-ray tube (Rankin Kennedy, Electrical Installations, Vol V, 1903)Betty Lamp, 18th century - Public domain dedication photoPatent Drawing of Engine - Burt solar compass patent 1836 - . Public domain imageHerald's Trumpet in C, copper alloy - musical instrumentsEggbeater, Pictorial Equipment Article, Kellogg. (3856709638)Värme- eller kylbänk?, Tekniska museet, SwedenMoreRelatedPSM V21 D055 The brewster stereoscope 1849PSM V13 D057 Sound wavesPSM V03 D423 Morse telegraphPSM V21 D214 Complex sound wavesPSM V09 D717 OphtalmoscopePSM V78 D326 Ptolemy - Drawing. Public domain image.MorePSM V19 D346 The spectrophonefile_downloadDownloadcrop_originalOrder Printrate_reviewdescriptionSummaryThe spectrophonelabel_outlineTagspopular science monthly illustrations volume 19sound wavesscientific illustrationssciencescience historypopular sciencedate_rangeDate1881createSourceWikimedia CommonslinkLinkhttp://commons.wikimedia.org/copyrightCopyright infopublic domain
