File:Popular science monthly (1872) (14782742962).jpg

Identifier: popularsciencemo89newyuoft (find matches)
Title: Popular science monthly
Year: 1872 (1870s)
Authors:
Subjects: Science
Publisher: New York : D. Appleton
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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esistance wire; andon one occasion a hftii was a phono-graph with a specially prepared record,which, without a doubt would frighten(jut of his wits the boldest thief whoheard its weird and uncanny warning. Here, then, we ha\c an electro-mechanical creature, which, hidden fromall view, and witii no human agency, willfire a re\-olver, send in an alarm, set offa charge of llash powder, and take thelihotograjih of an\- marauder who prowlsabout with a light. Dining tl\e course of a lectiiit- beforetile Chicago Electric Club and theNational IClectric Light Association, theauthor in the guise of the burglarstepped lip In the iilatforin in thedarkened lictini hall, ll.ishlight in h.ind:till instant the light fell upon the eye,I he revoUer began firing, the bell rang,tiu canura-shutter opened, the llash-lighl powder exploded, and the photo-graph on the following page resulted, nanother lecture .i phonogr.iph w,is use<Iand for five minutes therewasenactinl the l.H\ Shot by His Own Flashliuht
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The burglar breaks open the desk and flashes his light upon the contents of a drawer. Bang! goes a revolver aimed at him from inside the desk. Simultaneously a bell is rung which awakens the household and sends in an alarm to the police station lit 8 Popiihir Science Mnnilihj iinisiblo, l)iit by no means silent dramawliicli mis;ht follow such a catch in ahome. ihe cursing of the burglar, thescreams of h\sterical women and cr\-ing children, the excited father, and adrag-)iini-onl-li\-lhe-police-rinale\vere;)Iaiiil\ heard. Tlu- ;)rin(i;)al parts of the apparatus,which we lia\e callcil the eye and thebrain, are a selenium cell and asensitive rela\-;the n e r v o u senerg\ is suj)pliedby a battery of(ells, which an-connected inseries with themas shown in theii;)perdiagram. Ifonl> an alarm isdesired, an electricbell and batterymay be connectedto the loial cir-cuit terminals ofthe sensitiverelay. This bellwill ring instantlyw hen a lightstrikes the selenium cell, and willcontinue ringing

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