Transactions . four micro-metrical microscopes and to one second of arc. The telescopewas used for distances up to 112 miles. Scotts Tachy meter.—The writer has made no objection to interchangeable auxiliary telescope when placed on thetop of the main telescope under conditions almost identical withthe others mentioned.! AH that can fairly be deduced fromthe writers observations^ is, that he considers the models and Fig. 55 superior to all the other preceding ones describedby Mr. Scott. It was not intended to include Figs. 56 and 57in that list; but between these two a compari
Transactions . four micro-metrical microscopes and to one second of arc. The telescopewas used for distances up to 112 miles. Scotts Tachy meter.—The writer has made no objection to interchangeable auxiliary telescope when placed on thetop of the main telescope under conditions almost identical withthe others mentioned.! AH that can fairly be deduced fromthe writers observations^ is, that he considers the models and Fig. 55 superior to all the other preceding ones describedby Mr. Scott. It was not intended to include Figs. 56 and 57in that list; but between these two a comparison was made inreference to the mode of attaching the auxiliary telescope, withits possible effects. However much experience a man may have, * Royal Engineers, 1857, vol. ii., p. 408. f Trans., xxix., 985. X Trans., xxix., 973. 48 REMARKS ON INSTRUMENTS. it would be exceedingly unwise to attempt to criticise in too stricta manner (lie merits or demerits of .an instrument lie had not Fig. Ramsdens 36-Inch Theodolite. seen or proved. Considering, therefore, that Mr. Scotts formof instrument is a recent introduction, he naturally must be i;i:m kRKfl OH MINB-81 RVB1 [NG [NBTR1 mia I . J.» the beet expert with reference to its advantages and use, andwe must consequently bear him, and give credit to his evidenIt is, however, difficult to convince men that the form of in-strument they have been accustomed to use is not the is the way and prejudice f the world, and it is a hardmatter indeed to Bupplant entirely the old for the new, althoughthe latter may be vastly superior. Hosholds Engineers Theodolite,—Referring to Mr. Scotts re-marks,* the writer cannot find sufficient reason to change thepresent form o\ his Engineers Theodolite, Fig. T5,f to theform of an ordinary transit theodolite. The description whichthe writer lias already given of that instrument! was intendedto be sufficient to enable anyone to perceive the reason why itwas constructed in
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
