Home Index Site Map Up: Paper Navigation
Up: Paper

First: Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 1 Last: Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 287 Prev: Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 96 Next: Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 98 Navigation
Handbook: 97 of 287
·1 ·29 ·57 ·85 ·113 ·141 ·169 ·202 ·232 ·260
·2 ·30 ·58 ·86 ·114 ·142 ·170 ·205 ·233 ·261
·3 ·31 ·59 ·87 ·115 ·143 ·171 ·206 ·234 ·262
·4 ·32 ·60 ·88 ·116 ·144 ·172 ·207 ·235 ·263
§5 ·33 ·61 ·89 ·117 ·145 ·173 ·208 §236 ·264
·6 ·34 ·62 ·90 ·118 ·146 ·174 ·209 ·237 ·265
·7 ·35 ·63 ·91 ·119 ·147 ·175 ·210 ·238 §266
·8 ·36 ·64 ·92 ·120 ·148 ·176 ·211 ·239 ·267
·9 ·37 ·65 ·93 ·121 ·149 ·177 ·212 ·240 ·268
·10 ·38 ·66 ·94 ·122 ·150  ... ·213 ·241 ·269
§11 ·39 ·67 ·95 ·123 ·151 §186 ·214 ·242 ·270
·12 ·40 ·68 ·96 ·124 ·152 ·187 ·215 ·243 §271
·13 ·41 ·69 ·97 ·125 ·153 ·188 ·216 ·244 ·272
·14 ·42 ·70 ·98 ·126 ·154 ·189 ·217 ·245 ·273
§15 ·43 ·71 ·99 ·127 ·155 ·190 ·218 §246 ·274
·16 ·44 ·72 ·100 ·128 ·156 ·191 ·219 ·247 ·275
·17 ·45 ·73 ·101 ·129 ·157 ·192 ·220 ·248 ·276
§18 ·46 ·74 ·102 ·130 ·158 ·193 ·221 ·249 ·277
·19 ·47 ·75 ·103 ·131 ·159 ·194 ·222 ·250 ·278
·20 ·48 ·76 §104 ·132 ·160 ·195 ·223 ·251 ·279
§21 ·49 ·77 ·105 ·133 ·161 ·196 ·224 ·252 §280
·22 ·50 ·78 ·106 ·134 ·162 ·197 ·225 ·253 ·281
·23 ·51 §79 ·107 ·135 ·163 §198 ·226 ·254 ·282
·24 ·52 ·80 ·108 ·136 ·164 ·199 ·227 ·255 §283
·25 ·53 ·81 ·109 ·137 ·165 ·200 ·228 ·256 ·284
·26 ·54 ·82 ·110 ·138 ·166 ·201 ·229 ·257 ·285
·27 ·55 ·83 ·111 ·139 ·167 ·202 ·230 ·258 ·286
§28 ·56 ·84 ·112 ·140 ·168 ·203 ·231 ·259 ·287
 
amount of light. The walls of the court, so far as they show, should be made as white as possible.
    A modification of light court is suggested in Fig. F, in which the light court is of uniform length, but in the lower half of the elevation its width decreases successively at each floor. Where the ends of the light court are not needed for illumination, this modification saves considerable space for office purposes, and still gives the same amount of light. The sizes of the canopies are found by the same rule as is given above, but they are set out into the light court so that they form a sort of terrace, and the floor itself is carried out, thus adding to the available office space. The illustration shows the proper arrangement of the court where the width of the upper part is three-tenths the height of the whole court, and where the length is not more than two or three times the width of the court. If the length of the court is more than three times the width, then in order to get the same illumination on the several floors, we need a new rule, which is as follows: Measure the distance from the top of each canopy to the top of the light court, find the sum of these numbers; each of these numbers bears the same relation to this sum as the projection of the corresponding canopy bears to half the width of the light court at the top. Between the two extreme cases, viz. the square and the rectangle having one side three times the other, the sizes of the canopies can be determined with sufficient accuracy by interpolating between the sizes given by the two rules.
    In stores it is generally possible to do away with light shafts by installing prisms either in the front or in the front and rear, according to the size. In case of illumination from both ends of the store, all stairways and elevators should be located, if possible, in the middle of the store. Where it is desirable to employ a light shaft to illuminate the central portion of a long store, the modification show above of the light court can be used to considerable advantage. The light shaft should be set with its longest dimension at right angles to the length of the store, and occupy nearly the full width of the store. Whenever prisms are installed in the windows of light shafts which are covered over with skylight glass the skylight glass should have a polished surface
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 97