- Email: [email protected]
On the injurious effects of the flickering of gas-lights
216
Franklin Institute.
In each pistol there are fifty-three distinct certain amount of practice. pieces, including fourteen screws ; and, for the fon!!ation of these, forty or forty-five separate machines co-operate-hammering, milling, cutting, drilling, punching, rifling, and shaving; all put into motion by a gallon of water “in a violent perspiration a” , in other words, a 20-horse power look at steam engine. . Some of the machines are especially beautiful: that for ritling and barrels, for example, with the brush to keep the cutters clean; and the one near it for drilling the six chambers around the central boring in the solid cylinder, where accuracy is so indispensable. That regular irregularity, the eccentric, plays an important part in this, as it does in the hammering machine below ;-the machine patented by Ryder, Last week they turned out ,525 perfect pistols here, and there are the means for making 800 or 900 a week, if it were ‘necessary to do so. On the Injurious EJects of th Flickering of Gas-Lights.* A correspondent, “ C. W.,” calls dtention to the injurious effects of the flickering of gas-lights ,without chimney glasses on the eyesight of clerks in offices, many of whom, he has had opportunity of knowing, have had their sight so damaged, that, by the time they reach middle age, if much accustomed from youth to at!entire fixture of the eye on white paper, under gas-light, they are unable to see or to write or read withPublic companies, hoards, kc., as our correspondent reout spectacles. marks, ought to look to this.
FRANKLIN
INSTITUTE.
Proceedings of the Stated .Monthly .Meeting, August 16fh, 1855. John Agnew, Vice President, in the Chair. Jsaac B. Garrigues, Recordiqg Secretary. The minutes of the last meeting were read and approved. Letters were read from The Royal Geographical Society, and from the Commissioners of Patents, London. Donations to the Library were received from The Royal Geographical Society ; the Institute of Actuaries ; the Chemical Society ; the Statistical Society ; and the Royal Institute of British Architects, London ; Lieut. Colonel Baird Smith, Roorkee, India; Lieut. M. F.. Maury, U. S. N., Washington City, D. C.; the Ohio Mechanics’ Institute, Cincinnati, 0.; S. D. Humphreys, City of New York ; Ellwood Morris, Civ. Eng., Cold Spring, Pennsylvania ; and H. Haupt, Civ. Eng., Philadelphia, Pa. The Periodicals received in exchange for the Journal of the Institute, were laid on the table. The Treasurer’s statement of the receipts and payments for July was read. The Board of Managers and Standing Committees reported their minutes. Candidates for membership in the Institute, (2,) were proposed, qnd the candidates proposed at the last meeting, (2,) were duly elected. ‘From the London, Builder, No. 634.
Franklin Institute.
In each pistol there are fifty-three distinct certain amount of practice. pieces, including fourteen screws ; and, for the fon!!ation of these, forty or forty-five separate machines co-operate-hammering, milling, cutting, drilling, punching, rifling, and shaving; all put into motion by a gallon of water “in a violent perspiration a” , in other words, a 20-horse power look at steam engine. . Some of the machines are especially beautiful: that for ritling and barrels, for example, with the brush to keep the cutters clean; and the one near it for drilling the six chambers around the central boring in the solid cylinder, where accuracy is so indispensable. That regular irregularity, the eccentric, plays an important part in this, as it does in the hammering machine below ;-the machine patented by Ryder, Last week they turned out ,525 perfect pistols here, and there are the means for making 800 or 900 a week, if it were ‘necessary to do so. On the Injurious EJects of th Flickering of Gas-Lights.* A correspondent, “ C. W.,” calls dtention to the injurious effects of the flickering of gas-lights ,without chimney glasses on the eyesight of clerks in offices, many of whom, he has had opportunity of knowing, have had their sight so damaged, that, by the time they reach middle age, if much accustomed from youth to at!entire fixture of the eye on white paper, under gas-light, they are unable to see or to write or read withPublic companies, hoards, kc., as our correspondent reout spectacles. marks, ought to look to this.
FRANKLIN
INSTITUTE.
Proceedings of the Stated .Monthly .Meeting, August 16fh, 1855. John Agnew, Vice President, in the Chair. Jsaac B. Garrigues, Recordiqg Secretary. The minutes of the last meeting were read and approved. Letters were read from The Royal Geographical Society, and from the Commissioners of Patents, London. Donations to the Library were received from The Royal Geographical Society ; the Institute of Actuaries ; the Chemical Society ; the Statistical Society ; and the Royal Institute of British Architects, London ; Lieut. Colonel Baird Smith, Roorkee, India; Lieut. M. F.. Maury, U. S. N., Washington City, D. C.; the Ohio Mechanics’ Institute, Cincinnati, 0.; S. D. Humphreys, City of New York ; Ellwood Morris, Civ. Eng., Cold Spring, Pennsylvania ; and H. Haupt, Civ. Eng., Philadelphia, Pa. The Periodicals received in exchange for the Journal of the Institute, were laid on the table. The Treasurer’s statement of the receipts and payments for July was read. The Board of Managers and Standing Committees reported their minutes. Candidates for membership in the Institute, (2,) were proposed, qnd the candidates proposed at the last meeting, (2,) were duly elected. ‘From the London, Builder, No. 634.