Blocks & Prism
Product Details:
Spherometer  [108.19 PH] Brass dial head 40 mm diameter with stainless steel screw 0.5 mm or 0.1 mm pitch, head divided in 100 divisions, reading to .001 mm or .005 mm & registering on vertical scale10-0-10 mm frame with feet of stainless steel on p.c.d. of 46 mm. Separation approx. 40 mm. Zero adjustment can be done by unscrewing thumb screw.  Glass Block, Rectangular  [108.20 PH] Without bubbles, made from sheet glass, all sides polished.TypeABSize75 x 50 x 18 mm115 x 60 x 18 mm Glass Block, Moulded Glass  [108.21 PH] Same as 108.20 but made from moulded glass  Perspex Block, Rectangular  [108.22 PH] Rectangular of clear perspex, al faces fully polished.Size : 115 x 60 x 20 mm approx. Perspex Block, Semicircular  [108.23 PH] Of clear perspex, all faces nicely polished 80 mm dia