The Repertory of Arts and Manufactures Volume . 5

The Repertory of Arts and Manufactures Volume . 5

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1796 edition. Excerpt: ...crooked as possible, in order to prevent the said bolt from being moved by any counterfeit application when the key is absent; the bit of which said key is so cut or shaped as to form a complete tally with the said wheels and wards, and is thereby capable of producing the required effect, when applied for the purpose of moving the bolt. Now the insufficiency of this method method of rendering locks a perfect security is as follows: viz. notwithstanding the said wheels and wards may be variously placed and disposed, yet they cannot by any means become sufficient to answer the intended purpose, owing to their being always left fixed in the lock. Their form and disposition can be easily obtained by impression; so that, notwithstanding they may prevent the use ot effect of picklocks, yet the making a perfect or skeleton key is always extremely practicable. And sarther, the variations capable of being made in the disposition of the said wheels or wards, and the form of the key's bit, are not sufficient to produce the required number of locks, without having great quantities exactly alike, and their keys capable of opening each other reciprocally; from which they become a very imperfect security, as any ill-disposed person may, by furnishing himself with a number of old keys, be enabled to open almost all the common locks in the kingdom, with as little difficulty as if he had in his possession the key belonging to each lock. To remedy these objections, by discovering some principle or method whereby die success of pickFf 2 locks, locks, salse keys, and all other counterfeit means of opening locks, may be insallibly prevented, has been the ultimate design of my said invention, and may be effected in manner following; viz. instead of introducing (for...
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Product details

  • Paperback | 76 pages
  • 189 x 246 x 4mm | 154g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236590635
  • 9781236590633