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Scientific American, Vol. 30, No. 22 (1874) (1874)
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e of “On a plate of glass twenty-five films of selenite of equal The accuracy with which the solar time may be indicated by thickness are arranged at equal distances radially in a semi- erably enhauced by the higher velocity which would doubt- circle; they are so placed that the line bisecting the… … experiments with the 88 tun gun at the proof butts), as the ro Tue green color of the boron flame may be very well shown caliber is'increased, so the charge may be increased in pro- of certainly¥5 inches, we little doubt.—Znhe Engineer. © 1874 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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