School and Industrial Hygiene |
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Page 71
... height , are , together with the upper arm , freely suspended on the ribs , and in no way support- ing the body ; both elbows on a level with each other , and almost perpendicular under the shoulder - joint , without any support ; only ...
... height , are , together with the upper arm , freely suspended on the ribs , and in no way support- ing the body ; both elbows on a level with each other , and almost perpendicular under the shoulder - joint , without any support ; only ...
Page 73
... [ height of the ] desk and seat is too great , the chest is supported by the projecting shoulders , instead of the shoulders resting on the thorax . Soon this position becomes too fatiguing ; the head , bent forward , becomes too heavy ...
... [ height of the ] desk and seat is too great , the chest is supported by the projecting shoulders , instead of the shoulders resting on the thorax . Soon this position becomes too fatiguing ; the head , bent forward , becomes too heavy ...
Page 74
... height that , as the child sits upright and lets the arms fall freely , the elbows are about an inch lower than the edge . For girls , the desk may be one - half or three- quarters of an inch higher than this . It is a very common fault ...
... height that , as the child sits upright and lets the arms fall freely , the elbows are about an inch lower than the edge . For girls , the desk may be one - half or three- quarters of an inch higher than this . It is a very common fault ...
Page 76
... Height of the Scholar . Height of front edge of desk above the floor . Height of back edge of desk above the floor . Height of seat from floor ( or foot - rest ) . " Difference ' " between seat and desk . " Distance . " Height of upper ...
... Height of the Scholar . Height of front edge of desk above the floor . Height of back edge of desk above the floor . Height of seat from floor ( or foot - rest ) . " Difference ' " between seat and desk . " Distance . " Height of upper ...
Page 77
... height of each child should be effected by varying the height of the seat and the foot - board . 3. The edge of the table is always to be perpen- dicular to that of the seat . * ❝School Life in its Influence on Sight ; " a lecture ...
... height of each child should be effected by varying the height of the seat and the foot - board . 3. The edge of the table is always to be perpen- dicular to that of the seat . * ❝School Life in its Influence on Sight ; " a lecture ...
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adult allowed Amherst College amount Astigmatism attend Aurist better body boys brain causes cent CHAPTER chest chil child classes Cloth danger deformity desk-lid Diphtheria disease distance dren duty dyspepsia edge Edition Edwin Chadwick effect excessive exercise eyes fact fatigue feet foot-rest fresh air girls give gymnastics habit Health Primers heat height Hospital Hygiene Illustrations inches injury Jefferson Medical College labor large number light lumbar vertebrę Manual meals Medical College mental mind muscles myopia near-sight Nurses objects Obstetrics oculist person Philadelphia physician play poisonous position practical prevent Professor public schools pupils rest retina Rush Medical College scholars SCHOOL-DESKS AND SEATS school-life school-rooms shoulder-joint shoulders sitting sleep spinal curvature spine suitable teach teacher tendency thing three hours tion University of Pennsylvania ventilation vigorous women writer's cramp writing young
Popular passages
Page 134 - A child, young person, or woman, shall not be allowed to work between the fixed and traversing part of any self-acting machine while the machine is in motion by the action of steam, water, or other mechanical power.