No coin nor oath required. For personal study only.
Artificial Lithographic Stone.--A. Regel, of Gotha, Ires fbund that artilleial plates of 1)ortland cement may be used with advautage in lithogral)h F as a sul)stit(m' tbr the costly Sohrhofk, n stone.--Di,igle/s Joto'n~d.
(!. Hydraulic Tubing.--(L [)arravieini recommends a more ge.|leral substitution of'terra cotta and cement tubes fi)r those of brick and stone, in sewers, water-ways and other similar (mderground structures. 2~nt()ng' the adv'mtagcs whi(,h ht~ emmmratcs are: l, Reduced cost of tbundalions ; 2, Ease of building in rmmlng' water ; 3, Saving of time in eonstru(!tion; .1, Possil)ilitv 0t:' (:re'tying on the work in winter and at other times when lahor is eheal).--l/1)oliteenico.
C.
๐ SIMILAR VOLUMES
Warming and Ventilation, etc. 77 Warming and Ventilation.--Flavitsky uses double windows, placing an air-chamber under each window, into which the fresh outside air is admitted, and heated by .ribbed tubes, by means of water or steam. The hot air rises between the windows, and enters the room near