nd figure, where the por- It will be evident that a ray of light entering one of tion on the left, carrying the suspension rails, is the sea, these openings or windows will be turned through an more recent connection with the older part angle of 180 degrees, being reflected from on the right, of… … line in such a way as to equalize the speed on prism should, therefore, prove of great as- the two lines and transfer the surplus of pow- sistance to navigation, offering, as it does accurate observations both for the harbor and the The following are some numerical data respecting er from the one…
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