A practical treatise on gas and ventilation : with special relation to illuminating, heating, and cooking by gas : including scientific helps to engineer-students and others / by E. E. Perkins.

  • Perkins, E. E.
Date:
1856
Catalogue details

Licence: Public Domain Mark

Credit: A practical treatise on gas and ventilation : with special relation to illuminating, heating, and cooking by gas : including scientific helps to engineer-students and others / by E. E. Perkins. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    the hundreds dial one-tenth of the distance from ten to one. We have lately compiled a dial facial card, practically illustrating the mode of marking off at sight and correctly register- ing the index; and as we have disposed of the copyright, it would be unjust if we were here to enter more fully upon this subject. The card is called Pears Gas Register, and we can candidly commend it to the public as calculated to aid the desire to economically burn gas, and tending to arrest abuse and any attempt at dishonesty or carelessness of the manufacturers' ein-