...contained in a small tube (a), which can be removed at pleasure, and which is shown in section in Fig. 48. Below the prism is an achromatic eyepiece having an...slit between the two lenses ; the upper lens being Fio. 47. furnished with a screw motion to focus the slit. A side slit capable of adjustment admits...

...contained in a small tube (a), which can "be removed at pleasure, and which is shown in section in Fig. 48. Below the prism is an achromatic eyepiece having an...slit between the two lenses ; the upper lens being f FIG. 47. furnished with a screw motion to focus the slit. A side slit capable of adjustment admits...

...and juices of plants. I am indebted to Mr. Browning for the following description of the instrument. The prism is contained in a small tube, A, which can...focus the slit. A side slit, capable of adjustment, adjusts, when required, a second beam of light from any object whose spectrum it is desired to compare...

...ificro-spectrtacoj*. The prism is contained in a small tube, which can be removed at pleasure. 1 '.«low the prism is an achromatic eye-piece, having an adjustable...two lenses, the upper lens being furnished with a scre\» motion to focus the slit. A side slit, capable of adjustment, admits, when required, a second...

...micro-spectroscopic eye-piece. The prism is contained in the tube A. Below the prism is an achromatic combination, having an adjustable slit between the two lenses, the upper lens being furnished with a screw-motion to focus the slit. C and H are milled heads which adjust the slit. D is an arrangement...

...inserting into the body-tube of the microscope, the prism of which is contained in a small tube, removable at pleasure. Below the prism is an achromatic eye-piece,...adjustable slit between the two lenses, the upper Ions being furnished with a screw motion to focus the slit. A side slit, capable of adjustment, admits,...