Inquiries into human faculty and its development . ption I will confine myself to the first instance only, andwill therefore speak of C as the carriage that supports the framethat holds the negative transparencies. C can be pushed alongthe board and be clamped anyw^here, and it has a rack andpinion adjustment; but it should have been made movable byrack and pinion along the whole length of the board. Theframe for the transparencies has the same movements of adjust-ment as those in the stage of a microscope. It rotates round ahollow axis, through which a beam of light is thrown, and inde-penden
Inquiries into human faculty and its development . ption I will confine myself to the first instance only, andwill therefore speak of C as the carriage that supports the framethat holds the negative transparencies. C can be pushed alongthe board and be clamped anyw^here, and it has a rack andpinion adjustment; but it should have been made movable byrack and pinion along the whole length of the board. Theframe for the transparencies has the same movements of adjust-ment as those in the stage of a microscope. It rotates round ahollow axis, through which a beam of light is thrown, and inde-pendent movements in the plane, at right angles to the axis, canbe given to it in two directions, at right angles to one another, ^ I have since had a more substantial instrument made with these andsimilar improvements. 356 APPENDIX. by turning two separate screws. The beam of light is furnishedby three gas-burners, and it passes through a condenser. Thegas is supplied through a flexible tube that does not interfere DIAGRAM SHOWING THE ESSENTIAL Side View.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectability, bookyear1883
