Fred T. Hodgson · Frederick J. Drake and Co. · leaf 417
re let into chases andpinned after the walls are built. Illustration No. 25shows a section of treads and risers. HOW TO USE THEM 413 Closed Outer Strings.—Staircases are sometimes fin-ished with a close outer string, which prevents dirt orwet falling- into the well. Illustration No. 26 showsthe… … Fig. I. Fig. 2. NO. 26. situ. This is best effected by fixing a reverse mouldat each side, then filling in the space from the top. Thetop is finished by hand and the aid of a template. Thedowel holes are formed as already described. Concrete Floors.—It has been mentioned that theRomans, in the time…
