. The book of photography; practical, theoretical and applied. on a turntable (Fig. 720),which is spun rovmd at a rapid rate,and a camel-hair brush dipped in theblack varnish or enamel is brought downvertically until it just touches the edgeof the cover glass; the rotation of theslide causes the formation of a ring of thematerial which entirely covers the edge ofthe cover glass and seals it up. Fig. 721shows a self-centring turntable, which,immediately it is rotated, brings the slide and are mounted in Canada balsam underconsiderable pressure. Portions of insectsare obtained by dissection, Avh
. The book of photography; practical, theoretical and applied. on a turntable (Fig. 720),which is spun rovmd at a rapid rate,and a camel-hair brush dipped in theblack varnish or enamel is brought downvertically until it just touches the edgeof the cover glass; the rotation of theslide causes the formation of a ring of thematerial which entirely covers the edge ofthe cover glass and seals it up. Fig. 721shows a self-centring turntable, which,immediately it is rotated, brings the slide and are mounted in Canada balsam underconsiderable pressure. Portions of insectsare obtained by dissection, Avhich is arather delicate operation, and needs to bedone under a low power lens to magnifythe parts. Vegetable preparations aremounted in different ways; the seeds,pollen, etc., may be mounted dry, a ringof black varnish first being made on theslide in which the specimens are placed,and a cover glass is then cemented on withanother ring of black varnish round it. Mounting Starceies, etc. Starches, etc., may be mounted inglycerine jelly or in one of the aqueous.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
